{"id":249,"date":"2023-07-23T03:17:28","date_gmt":"2023-10-12T08:02:09","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e6%9c%80%e5%88%9d%e3%81%ae%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0%e3%82%92java%e3%81%a7%e6%9b%b8%e3%81%8f%e6%96%b9%e6%b3%95\/"},"modified":"2025-07-31T22:00:00","modified_gmt":"2025-07-31T13:00:00","slug":"%e6%9c%80%e5%88%9d%e3%81%ae%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0%e3%82%92java%e3%81%a7%e6%9b%b8%e3%81%8f%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e6%9c%80%e5%88%9d%e3%81%ae%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0%e3%82%92java%e3%81%a7%e6%9b%b8%e3%81%8f%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u6700\u521d\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092Java\u3067\u66f8\u304f\u65b9\u6cd5"},"content":{"rendered":"<p>\u7b46\u8005\u306f\u3001\u5bc4\u4ed8\u6587\u7b46\u6d3b\u52d5\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e00\u74b0\u3068\u3057\u3066\u3001\u30d5\u30ea\u30fc\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3068\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u306e\u57fa\u91d1\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306b\u9078\u629e\u3057\u307e\u3057\u305f\u3002<\/p>\n<h3>\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3<\/h3>\n<p>Java\u306f\u5e45\u5e83\u3044\u7528\u9014\u306b\u4f7f\u7528\u3055\u308c\u308b\u3001\u6210\u719f\u304b\u3064\u8a2d\u8a08\u304c\u3057\u3063\u304b\u308a\u3068\u3055\u308c\u305f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002\u6388\u696d\u3067\u5b66\u3076\u3060\u3051\u3067\u306a\u304f\u3001\u5546\u7528\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u958b\u767a\u306b\u3082\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u7279\u9577\u306e\u4e00\u3064\u306f\u3001\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u3042\u308b\u3053\u3068\u3067\u3059\u3002Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4e00\u5ea6\u4f5c\u6210\u3059\u308b\u3068\u3001Linux\/Unix\u3092\u306f\u3058\u3081\u3068\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u3001Windows\u3084macOS\u3001Linux\u3092\u306f\u3058\u3081\u3068\u3059\u308b\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u3001\u305d\u3057\u3066Android\u3084iOS\u3092\u306f\u3058\u3081\u3068\u3059\u308b\u30e2\u30d0\u30a4\u30eb\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306a\u3069\u3001\u591a\u304f\u306e\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u4e0a\u3067\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Java\u306f\u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\uff08\u3064\u307e\u308a\u3001\u6a5f\u68b0\u6700\u9069\u5316\u3055\u308c\u305f\uff09\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u306f\u3001\u5b9f\u884c\u3059\u308b\u524d\u306b\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3082\u3057PHP\u3084Python\u306a\u3069\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u76f4\u63a5\u5b9f\u884c\u3067\u304d\u308b\u8a00\u8a9e\u306b\u6163\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30b3\u30fc\u30c9\u3092\u6700\u521d\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u3053\u3068\u306f\u958b\u767a\u30d7\u30ed\u30bb\u30b9\u306b\u304a\u3051\u308b\u65b0\u3057\u3044\u30b9\u30c6\u30c3\u30d7\u3068\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001Java\u3067\u300cHello, World!\u300d\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002 \u300cHello, World!\u300d\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u53e4\u5178\u7684\u3067\u4f1d\u7d71\u7684\u306a\u3082\u306e\u3067\u3059\u3002\u521d\u5fc3\u8005\u5411\u3051\u306e\u5b8c\u5168\u306a\u521d\u3081\u3066\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3042\u308a\u3001\u74b0\u5883\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u826f\u3044\u65b9\u6cd5\u3067\u3059\u3002 \u300cHello, World!\u300d\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001Java\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u3084Java\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u3068\u5b9f\u884c\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u5b66\u3073\u59cb\u3081\u307e\u3059\u3002\u7d42\u4e86\u3057\u305f\u3089\u3001\u57fa\u672c\u7684\u306aJava\u30b3\u30fc\u30c9\u306e\u8a18\u8ff0\u3068\u5b9f\u884c\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u524d\u63d0\u6761\u4ef6<\/h2>\n<p>\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u6b21\u306e\u3082\u306e\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Java (version 11 or above) installed on your machine. For Ubuntu and Debian, follow the steps for Option 1 in our tutorial, How To Install Java with Apt on Ubuntu 22.04. For other operating systems, including Mac and Windows, see the download options for Java installation.<\/li>\n<li>A compiler provided by the Java Development Kit (JDK). To compile the source code, you\u2019ll use the default Java compiler called javac. You can compile your source either on your local computer or on a remote server in the cloud. For Ubuntu, you can follow the JDK installation instructions in Option 1 from How To Install Java with Apt on Ubuntu 22.04. For other platforms, see Oracle\u2019s JDK Installation Guide or the official instructions for installing OpnJDK version 11 or above.(Optional) A Java Runtime Environment (JRE) that will execute the compiled code. The JRE is part of the JDK, so you don\u2019t have to install it additionally if you have already installed the JDK. Otherwise, you can install the JRE separately. This can be useful if you intend to run your code on a remote server where you don\u2019t want to compile code for security reasons. In this kind of server-oriented scenario, you can download and install the JRE via the native package manager. For Ubuntu and Debian, use sudo apt install openjdk-11-jre. For other distributions, use the respective package managers and search for the keyword jre and choose version 11 or above.<\/li>\n<li>A terminal in which to execute commands. Java is well supported on all major operating systems, which means you can follow the instructions on your local computer and use a terminal to connect to a remote server. For guidance on connecting to remote servers, follow our Initial Server Setup Guide.<\/li>\n<li>A text editor such as nano. To get started writing Java code, you can use any text editor. However, to code efficiently, consider using an integrated development environment (IDE), such as Eclipse IDE. IDEs are useful because they correct your syntax, autocomplete your code, and allow you to test the code directly, saving you the manual compilation step. However, IDEs are not always intuitive and may confuse you if you haven\u2019t used them before. For your first Java program, it may be easier to use the text editor you are used to.<\/li>\n<\/ul>\n<h2>Java\u3067\u300cHello, World!\u300d\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u3068\u5b9f\u884c\u3059\u308b\u3002<\/h2>\n<p>\u591a\u304f\u306e\u4eba\u306b\u3068\u3063\u3066\u3001\u5f7c\u3089\u306e\u6700\u521d\u306eJava\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3057\u3070\u3057\u3070\u5f7c\u3089\u306e\u6700\u5f8c\u306eJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3082\u3042\u308a\u307e\u3059\u3002\u554f\u984c\u306f\u3001\u6700\u3082\u5358\u7d14\u306a\u30b3\u30fc\u30c9\u3055\u3048\u8907\u96d1\u3059\u304e\u308b\u3088\u3046\u306b\u601d\u3048\u3001\u305d\u308c\u3092\u5b8c\u5168\u306b\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u65b0\u3057\u3044\u3053\u3068\u3092\u5b66\u3070\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u3088\u304f\u3042\u308b\u843d\u3068\u3057\u7a74\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u307e\u305a\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u3001\u5b9f\u884c\u3057\u3001\u305d\u308c\u304c\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u304b\u3092\u5b66\u3076\u3053\u3068\u304b\u3089\u59cb\u3081\u307e\u3059\u3002<\/p>\n<p>\u306f\u3058\u3081\u306b\u3001\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306e\u305f\u3081\u306e\u30b3\u30fc\u30c9\u3092\u914d\u7f6e\u3059\u308b\u305f\u3081\u306b\u3001hello-world\u3068\u3044\u3046\u65b0\u3057\u3044\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u4f5c\u6210\u3057\u3001\u305d\u308c\u306b\u79fb\u52d5\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u30bf\u30fc\u30df\u30ca\u30eb\u3067\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\"><span class=\"token function\">mkdir<\/span> <mark>hello-world<\/mark><\/li>\n<li data-prefix=\"$\"><span class=\"token builtin class-name\">cd<\/span> <mark>hello-world<\/mark><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u6b21\u306b\u3001nano\u307e\u305f\u306f\u304a\u6c17\u306b\u5165\u308a\u306e\u30c6\u30ad\u30b9\u30c8\u30a8\u30c7\u30a3\u30bf\u3092\u4f7f\u7528\u3057\u3066\u3001Hello.java\u3068\u3044\u3046\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002nano\u306e\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\"><span class=\"token function\">nano<\/span> Hello.java<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306f\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u300cHello, World!\u300d\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3059\u308b\u305f\u3081\u306e\u6700\u5c0f\u9650\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<div>\u3053\u3093\u306b\u3061\u306f\u3001\u4e16\u754c\/Hello.java<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"1\"><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Hello<\/span> <span class=\"token punctuation\">{<\/span><\/li>\n<li data-prefix=\"2\"><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/li>\n<li data-prefix=\"3\"><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#8220;Hello, World!&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/li>\n<li data-prefix=\"4\"><span class=\"token punctuation\">}<\/span><\/li>\n<li data-prefix=\"5\"><span class=\"token punctuation\">}<\/span><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001\u300cHello, World!\u300d\u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b\u3057\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u540d\uff08\u3053\u306e\u5834\u5408\u306f\u3001\u62e1\u5f35\u5b50\u304c .java \u306e Hello\uff09\u306f\u3001\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u5185\u306e\u516c\u958b\u30af\u30e9\u30b9\u306e\u540d\u524d\uff08Hello\uff09\u3068\u4e00\u81f4\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u30d5\u30a1\u30a4\u30eb\u540d\u3068\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u5185\u306e\u516c\u958b\u30af\u30e9\u30b9\u540d\u3092\u4e00\u81f4\u3055\u305b\u308b\u3053\u3068\u306f\u3001Java\u306e\u4e00\u822c\u7684\u306a\u6163\u4f8b\u3067\u3059\u3002\uff08\u5f79\u7acb\u3064\u30b3\u30fc\u30c9\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306b\u306f\u3001Java\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u30d5\u30a1\u30a4\u30eb\u306e\u547d\u540d\u65b9\u6cd5\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u3053\u306e\u6163\u4f8b\u3092\u899a\u3048\u3066\u304a\u304f\u3068\u4fbf\u5229\u3067\u3059\u3002\uff09<\/p>\n<p>\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u5b58\u3057\u3066\u9589\u3058\u3066\u304f\u3060\u3055\u3044\u3002nano\u3092\u4f7f\u7528\u3057\u3066\u3001\u7d42\u4e86\u3059\u308b\u306b\u306fCTRL+X\u3092\u62bc\u3057\u3001\u4fdd\u5b58\u3059\u308b\u306b\u306fY\u3092\u62bc\u3057\u3001\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u78ba\u8a8d\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u9589\u3058\u308b\u306b\u306fENTER\u3092\u62bc\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u30bf\u30fc\u30df\u30ca\u30eb\u3067\u3001Hello.java\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3068\u540c\u3058\u5834\u6240\u304b\u3089javac\u3092\u5b9f\u884c\u3057\u3001\u30b3\u30fc\u30c9\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\">javac Hello.java<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u5143\u306eJava\u30b3\u30fc\u30c9\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u6307\u5b9a\u3057\u3066javac\u3092\u4f7f\u7528\u3057\u3066\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u6700\u5f8c\u306b\u3001\u3053\u306e\u3088\u3046\u306bjava\u306e\u5b9f\u884c\u53ef\u80fd\u30d5\u30a1\u30a4\u30eb\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002 (Saigo ni, kono y\u014d ni java no jikk\u014dkan\u014d fairu de puroguramu o jikk\u014d shite kudasai.)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\"><span class=\"token function\">java<\/span> Hello<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u306b\u306f\u3001java\u30b3\u30de\u30f3\u30c9\u306e\u5f8c\u308d\u306b\u30af\u30e9\u30b9\u306e\u540d\u524d\uff08\u3053\u306e\u4f8b\u3067\u306fHello\uff09\u3092\u5165\u529b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30b3\u30fc\u30c9\u306e\u5b9f\u884c\u6642\u306b\u306f\u3001.java\u3084.class\u306a\u3069\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u306e\u62e1\u5f35\u5b50\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u51fa\u529b\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n<div>\u51fa\u529b<\/div>\n<pre class=\"post-pre\"><code>Hello, World!\r\n<\/code><\/pre>\n<p>\u3042\u306a\u305f\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u6210\u529f\u88cf\u306b\u5b9f\u884c\u3055\u308c\u307e\u3057\u305f\uff01\u57fa\u672c\u7684\u306aJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u5b9f\u884c\u3057\u307e\u3057\u305f\u3002\u6b21\u306b\u3001\u305d\u308c\u304c\u3069\u306e\u3088\u3046\u306b\u52d5\u4f5c\u3059\u308b\u304b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>\u300cHello, World!\u300d\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u7406\u89e3<\/h2>\n<p>\u300cPython\u3084JavaScript\u3067\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u306b\u6163\u308c\u3066\u3044\u308b\u65b9\u306f\u3001Java\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u5c0f\u3055\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3082\u3001\u3059\u3079\u3066\u306eJava\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u306f\u5c11\u306a\u304f\u3068\u30822\u3064\u306e\u8981\u7d20\u304c\u5fc5\u8981\u3067\u3059\u3002\u300d<\/p>\n<ul class=\"post-ul\">\n<li>A class for your code.<\/li>\n<li>A main method inside your class.<\/li>\n<\/ul>\n<p>Java\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u3067\u3042\u308b\u305f\u3081\u3001\u30af\u30e9\u30b9\u304c\u5fc5\u8981\u3067\u3059\u3002\u5168\u3066\u306e\u30b3\u30fc\u30c9\u306f\u30af\u30e9\u30b9\u306e\u4e00\u90e8\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30af\u30e9\u30b9\u306f\u6a5f\u80fd\u7684\u306b\u95a2\u9023\u3059\u308b\u30b3\u30fc\u30c9\u3067\u3042\u308a\u3001\u901a\u5e38\u3001\u5358\u72ec\u3067\u306f\u52d5\u4f5c\u3057\u307e\u305b\u3093\u304c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30af\u30e9\u30b9\u306e\u5177\u4f53\u7684\u306a\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308a\u3001\u30b3\u30fc\u30c9\u5185\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u3042\u308a\u3001\u305d\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u308b\u3068\u52d5\u4f5c\u3057\u307e\u3059\u3002<\/p>\n<p>\u3042\u306a\u305f\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001\u30af\u30e9\u30b9\u306fHello\u3067\u3059\u3002<\/p>\n<div>\u3053\u3093\u306b\u3061\u306f\u3001\u4e16\u754c\/Hello.java<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"1\"><mark><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Hello<\/span> <span class=\"token punctuation\">{<\/span><\/mark><\/li>\n<li data-prefix=\"2\"><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/li>\n<li data-prefix=\"3\"><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#8220;Hello, World!&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/li>\n<li data-prefix=\"4\"><span class=\"token punctuation\">}<\/span><\/li>\n<li data-prefix=\"5\"><span class=\"token punctuation\">}<\/span><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u30b3\u30fc\u30c9\u306e\u6700\u521d\u306e\u884c\u306f\u3001\u30af\u30e9\u30b9\u306e\u958b\u59cb\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30b9\u306f\u5e38\u306b\u30af\u30e9\u30b9\u306e\u5f8c\u306b\u7d9a\u304f\u3082\u306e\u3067\u59cb\u307e\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u30af\u30e9\u30b9\u306e\u540d\u524d\u306fHello\u3067\u3042\u308a\u3001.java\u62e1\u5f35\u5b50\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u540d\u524d\u3068\u4e00\u81f4\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u306e\u672b\u5c3e\u306b\u958b\u304d\u4e2d\u62ec\u5f27\uff08{\uff09\u3068\u9589\u3058\u4e2d\u62ec\u5f27\uff08}\uff09\u304c\u3042\u308a\u3001\u305d\u306e\u4e2d\u306b\u30af\u30e9\u30b9\u306e\u30b3\u30fc\u30c9\u3092\u914d\u7f6e\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u30af\u30e9\u30b9\u306b\u306f\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u304c\u3042\u308a\u307e\u3059\uff08\u30e1\u30bd\u30c3\u30c9\u3082\u540c\u69d8\u3067\u3059\uff09\u3002\u3053\u306e\u5834\u5408\u3001\u305d\u306e\u4fee\u98fe\u5b50\u306fpublic\u3067\u3059\u304c\u3001\u305d\u308c\u306f\u5b8c\u5168\u306b\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u4e00\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u3064\u304d\u3001\u30af\u30e9\u30b9\u306f\u4e00\u3064\u306b\u3059\u308b\u306e\u304c\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3067\u3042\u308a\u3001\u30b3\u30fc\u30c9\u3092\u8aad\u307f\u3084\u3059\u304f\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u516c\u5f0f\u306e\u8981\u4ef6\u306b\u306f\u305d\u306e\u3088\u3046\u306a\u5236\u9650\u306f\u3042\u308a\u307e\u305b\u3093\u3057\u3001\u4e00\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u5185\u306b\u7121\u5236\u9650\u306e\u6570\u306e\u30af\u30e9\u30b9\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30d5\u30a1\u30a4\u30eb\u5185\u306e\u30af\u30e9\u30b9\u306e\u3046\u3061\u3001\u516c\u958b(public)\u3068\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u306f\u4e00\u3064\u3060\u3051\u3067\u3042\u308a\u3001\u305d\u306e\u30af\u30e9\u30b9\u306f\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3059\u308b\u540c\u3058\u540d\u524d\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30af\u30e9\u30b9\u306b\u52a0\u3048\u3066\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u306fmain\u30e1\u30bd\u30c3\u30c9\u3082\u3042\u308a\u307e\u3059\u3002\u30e1\u30a4\u30f3\u30e1\u30bd\u30c3\u30c9\u306f\u30af\u30e9\u30b9\u306e\u5b9f\u884c\u306e\u59cb\u307e\u308a\u306e\u5730\u70b9\u3067\u3042\u308a\u3001\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u306e\u59cb\u307e\u308a\u3067\u3082\u3042\u308a\u307e\u3059\u3002\u975e\u5e38\u306b\u5177\u4f53\u7684\u306a\u69cb\u6587\u304c\u3042\u308a\u307e\u3059\uff1apublic static void main(String[] args)\u3002<\/p>\n<div>\u3053\u3093\u306b\u3061\u306f\u4e16\u754c\/Hello.java<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"1\"><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Hello<\/span> <span class=\"token punctuation\">{<\/span><\/li>\n<li data-prefix=\"2\"><mark><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span><\/mark> <span class=\"token punctuation\">{<\/span><\/li>\n<li data-prefix=\"3\"><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#8220;Hello, World!&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/li>\n<li data-prefix=\"4\"><span class=\"token punctuation\">}<\/span><\/li>\n<li data-prefix=\"5\"><span class=\"token punctuation\">}<\/span><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>public\u306f\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3067\u3042\u308a\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u306b\u5236\u9650\u304c\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>static\u306f\u3001\u30e1\u30bd\u30c3\u30c9\uff08\u3053\u306e\u5834\u5408\u306f\uff09\u307e\u305f\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u660e\u793a\u7684\u306b\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u306a\u304f\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3053\u3068\u3092\u793a\u3059\u7279\u5225\u306a\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u3059\u3002\u3053\u308c\u306b\u306f\u591a\u304f\u306e\u7528\u9014\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u7279\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6700\u521d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u81ea\u4f53\u306e\u4e00\u90e8\u3067\u306a\u3044\u30b3\u30fc\u30c9\u3067\u4f5c\u6210\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u300c\u9d8f\u3068\u5375\u306e\u554f\u984c\u300d\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\n<p>\u623b\u308a\u5024\u306e\u578b\u306fvoid\u3067\u3001\u305d\u308c\u306f\u547c\u3073\u51fa\u3057\u5143\u306b\u4f55\u3082\u8fd4\u3055\u308c\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u753b\u9762\u306b\u8868\u793a\u3057\u3001\u5b9f\u884c\u7d50\u679c\u3092\u76f4\u63a5\u6d88\u8cbb\u3057\u307e\u3059\u3002void\u306f\u3053\u3053\u3067\u306f\u4f55\u3082\u8fd4\u3055\u306a\u3044\u3082\u306e\u306e\u3001\u4ed6\u306e\u5834\u5408\u3067\u306f\u30e1\u30bd\u30c3\u30c9\u306f\u3057\u3070\u3057\u3070\u3001\u82f1\u6570\u5b57\u3001\u6574\u6570\u3001\u307e\u305f\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306a\u3069\u306e\u3055\u307e\u3056\u307e\u306a\u60c5\u5831\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u4e3b\u306a\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u307e\u305f\u306f\u5165\u529b\u306fString[] args\u3067\u3059\u3002 \u6587\u5b57\u5217\u306e\u9023\u7d9a\u307e\u305f\u306f\u6587\u5b57\u5217\u306f\u3001\u82f1\u6570\u5b57\u306e\u60c5\u5831\u3092\u4fdd\u5b58\u3057\u307e\u3059\u3002\u89d2\u62ec\u5f27\uff08[ ]\uff09\u306f\u3001\u5358\u4e00\u306e\u6587\u5b57\u5217\u3067\u306f\u306a\u304f\u3001\u6587\u5b57\u5217\u306e\u914d\u5217\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u914d\u5217\u306e\u540d\u524d\u306fargs\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001main()\u306b\u306f\u5f15\u6570\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u3082\u3057\u5f15\u6570\u304c\u3042\u308c\u3070\u3001\u3053\u306e\u914d\u5217\u306b\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057\u3082\u30e1\u30a4\u30f3\u30e1\u30bd\u30c3\u30c9\u306e\u5c5e\u6027\uff08\u4f8b\u3048\u3070\u3001public\u3067\u3042\u308b\u3068\u3044\u3046\u4e8b\u5b9f\uff09\u306e\u3044\u305a\u308c\u304b\u3092\u898b\u843d\u3068\u3059\u3068\u3001\u69cb\u6587\u30a8\u30e9\u30fc\u306f\u8d77\u3053\u308a\u307e\u305b\u3093\u304c\u3001\u610f\u56f3\u3057\u305f\u901a\u308a\u306b\u6a5f\u80fd\u3057\u306a\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\uff08\u59cb\u307e\u308a\u306e\u30dd\u30a4\u30f3\u30c8\u3068\u3057\u3066\uff09\u3002<\/p>\n<p>\u30c6\u30ad\u30b9\u30c8\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b\u3059\u308b\u306b\u306f\u3001System.out.println() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<div>\u300c\u3053\u3093\u306b\u3061\u306f\u3001\u4e16\u754c\/Hello.java\u300d\u3068\u3044\u3046\u30d7\u30ed\u30b0\u30e9\u30e0\u30d5\u30a1\u30a4\u30eb<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"1\"><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Hello<\/span> <span class=\"token punctuation\">{<\/span><\/li>\n<li data-prefix=\"2\"><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/li>\n<li data-prefix=\"3\"><mark><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#8220;Hello, World!&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/mark><\/li>\n<li data-prefix=\"4\"><span class=\"token punctuation\">}<\/span><\/li>\n<li data-prefix=\"5\"><span class=\"token punctuation\">}<\/span><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u884c\u52d5\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u3092\u30e1\u30bd\u30c3\u30c9\u3068\u8a00\u3044\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u305f\u3081\u306b\u3001\u62ec\u5f27 () \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u81ea\u4f53\u306fprintln()\u3067\u3042\u308a\u3001\u5370\u5237\u3055\u308c\u308b\u30c6\u30ad\u30b9\u30c8\u306e1\u3064\u306e\u5f15\u6570\u3092\u53d7\u3051\u5165\u308c\u307e\u3059\u3002System.out\u306f\u30e1\u30bd\u30c3\u30c9\u304cJava\u306e\u30b3\u30a2\uff08System\uff09\u6a5f\u80fd\u3067\u3042\u308b\u51fa\u529b\uff08out\uff09\u306e\u4e00\u90e8\u3067\u3042\u308b\u3053\u3068\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u524d\u306b\u4ed8\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5834\u5408\u3001\u89aa\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u3042\u308b System \u306e\u4e00\u90e8\u3067\u3042\u308b\u30b5\u30d6\u30d1\u30c3\u30b1\u30fc\u30b8\u306e out \u304b\u3089\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002Java\u3067\u30af\u30e9\u30b9\u304c\u3069\u306e\u3088\u3046\u306b\u7d44\u7e54\u5316\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u3088\u308a\u3088\u304f\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u30af\u30e9\u30b9\u306e\u968e\u5c64\u304c\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u306e\u968e\u5c64\u3068\u4f3c\u3066\u3044\u308b\u3068\u60f3\u50cf\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u89aa\u30d5\u30a9\u30eb\u30c0\u3068\u95a2\u9023\u306e\u3042\u308b\u4f9d\u5b58\u3059\u308b\u30b5\u30d6\u30d5\u30a9\u30eb\u30c0\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002Java\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30d5\u30a9\u30eb\u30c0\u3092\u30d1\u30c3\u30b1\u30fc\u30b8\u3068\u547c\u3073\u307e\u3059\u3002\u95a2\u9023\u3059\u308b\u30af\u30e9\u30b9\u306f\u3001\u968e\u5c64\u304c\u3069\u308c\u3060\u3051\u7d30\u304b\u3044\u304b\u306b\u5fdc\u3058\u3066\u30011\u3064\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u307e\u305f\u306f\u30b5\u30d6\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u307e\u3068\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>System.out.println()\u306e\u5f15\u6570\u306f\u3001\u6587\u5b57\u5217&#8221;Hello, World!&#8221;\u3067\u3059\u3002\u6587\u5b57\u5217\u306f\u5e38\u306b\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u56f2\u307e\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u305d\u308c\u304c\u6587\u5b57\u5217\u3067\u3042\u308b\u3053\u3068\u3092\u79c1\u305f\u3061\u306f\u77e5\u3063\u3066\u3044\u307e\u3059\u3002PHP\u306a\u3069\u306e\u4ed6\u306e\u8a00\u8a9e\u3068\u7570\u306a\u308a\u3001\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u306fJava\u306e\u6587\u5b57\u5217\u306b\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>Java\u306e\u6587\u6cd5\u306e\u4e00\u3064\u306e\u7279\u7570\u306a\u70b9\u306f\u3001\u5404\u6587\u306e\u6700\u5f8c\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u5fc5\u8981\u3067\u3042\u308b\u3053\u3068\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u30c6\u30ad\u30b9\u30c8\u3092\u51fa\u529b\u3059\u308b\u305f\u3081\u306e\u6587\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\uff1aSystem.out.println(&#8220;Hello, world!&#8221;);\u3002<\/p>\n<div class=\"post-conf-note\">\n<p class=\"post-conf-desc\">Note<\/p>\n<div>\u6ce8\u610f\uff1a\u3082\u3057IDE\u307e\u305f\u306fJava\u69cb\u6587\u30b5\u30dd\u30fc\u30c8\u306e\u3042\u308b\u30c6\u30ad\u30b9\u30c8\u30a8\u30c7\u30a3\u30bf\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u81ea\u52d5\u7684\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u306e\u4e0d\u8db3\u306a\u3069\u306e\u69cb\u6587\u4e0a\u306e\u554f\u984c\u306f\u5fc3\u914d\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u3089\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u81ea\u52d5\u7684\u306b\u51e6\u7406\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/div>\n<\/div>\n<p>\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4e00\u884c\u305a\u3064\u78ba\u8a8d\u3057\u3066\u3001\u305d\u306e\u52d5\u4f5c\u539f\u7406\u3092\u7406\u89e3\u3057\u307e\u3057\u305f\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u5b9f\u884c\u3057\u305f\u969b\u306b\u4f55\u304c\u8d77\u3053\u308b\u304b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>\u300c\u3053\u3093\u306b\u3061\u306f\u3001\u4e16\u754c\uff01\u300d\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u5b9f\u884c\u3059\u308b<\/h2>\n<p>\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001Java\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u3068\u5b9f\u884c\u6642\u306b\u4f55\u304c\u8d77\u3053\u308b\u304b\u306b\u3064\u3044\u3066\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30b3\u30fc\u30c9\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u305f\u3081\u306b\u3001JDK\u304b\u3089javac\u3092\u4f7f\u7528\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\">javac Hello.java<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>javac\u306f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u8aad\u307f\u53d6\u308a\u3001\u69cb\u6587\u30a8\u30e9\u30fc\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u6700\u9069\u5316\u3092\u9069\u7528\u3057\u3001Hello.class\u3068\u3044\u3046\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u30d5\u30a1\u30a4\u30eb\u3092\u751f\u6210\u3057\u307e\u3059\u3002Java\u306e.class\u30d5\u30a1\u30a4\u30eb\u306f\u3001JRE\u304c\u89e3\u91c8\u3057\u3066\u5b9f\u884c\u3067\u304d\u308b\u6a5f\u68b0\u8a9e\u3067\u3059\u3002<\/p>\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u304b\u3089ls\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u3067\u3001Hello.class\u30d5\u30a1\u30a4\u30eb\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\"><span class=\"token function\">ls<\/span><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001\u73fe\u5728\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u3042\u308b\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u89a7\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p><mark>Hello.class<\/mark> Hello.java<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u30b3\u30fc\u30c9\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u305f\u5f8c\u306f\u3001JRE\u304b\u3089\u306ejava\u5b9f\u884c\u30d5\u30a1\u30a4\u30eb\u3067\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\"><span class=\"token function\">java<\/span> Hello<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>JRE\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f\u30b3\u30fc\u30c9\u306e\u307f\u3092\u5b9f\u884c\u3057\u3001\u6a19\u6e96\u306e\u4eba\u304c\u8aad\u3081\u308b\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u306e\u30b3\u30fc\u30c9\u306e\u5b9f\u884c\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u540c\u69d8\u306b\u3001\u6a19\u6e96\u306e\u30c6\u30ad\u30b9\u30c8\u30a8\u30c7\u30a3\u30bf\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f.class\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3082\u3046\u3068\u3057\u3066\u3082\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001Java Decompiler\u306a\u3069\u306e\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304c\u306a\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30c7\u30d0\u30c3\u30b0\u6642\u306b\u5f79\u7acb\u3064\u30b3\u30f3\u30d1\u30a4\u30eb\u6e08\u307f\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001JRE\u5b9f\u884c\u53ef\u80fd\u30d5\u30a1\u30a4\u30eb\u306eJava\u306b\u3001Hello.class\u30d5\u30a1\u30a4\u30eb\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308bHello\u3068\u3044\u3046\u30af\u30e9\u30b9\u3092\u51e6\u7406\u3059\u308b\u3088\u3046\u6307\u793a\u3057\u307e\u3059\u3002<\/p>\n<p>\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u300cHello, World!\u300d\u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u308b\u3068\u3001\u4ee5\u4e0b\u304c\u78ba\u8a8d\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<ul class=\"post-ul\">\n<li>You have a correctly working Java environment in which you are able to compile and execute code.<\/li>\n<li>Java has successfully located the code for the Hello class, and it is able to access it.<\/li>\n<li>The execution flow started from the main() method. There, the method System.out.println() has been invoked with the string argument Hello, World!. The welcome message has been printed on the screen.<\/li>\n<li>Since there is no other code, the program successfully exited.<\/li>\n<\/ul>\n<p>Java\u3092\u8d77\u52d5\u3059\u308b\u3053\u3068\u3067\u3001Java\u4eee\u60f3\u30de\u30b7\u30f3\uff08JVM\uff09\u3068\u547c\u3070\u308c\u308b\u4eee\u60f3\u30de\u30b7\u30f3\u306e\u4e00\u7a2e\u304c\u59cb\u307e\u308a\u307e\u3059\u3002\u4eee\u60f3\u30de\u30b7\u30f3\u306b\u3064\u3044\u3066\u306e\u4e00\u822c\u7684\u306a\u60c5\u5831\u306b\u3064\u3044\u3066\u306f\u3001\u5f53\u30b5\u30a4\u30c8\u306e\u8a18\u4e8b\u300c\u4eee\u60f3\u30de\u30b7\u30f3\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u300d\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u307e\u3059\uff08\u30aa\u30d7\u30b7\u30e7\u30f3\u306f\uff11\u3064\u306e\u307f\uff09:<br \/>\nJVM\u306f\u3001\u5916\u90e8\u74b0\u5883\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3001\u307e\u305f\u306f\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u306b\u4f9d\u5b58\u305b\u305a\u3001\u5341\u5206\u306b\u9694\u96e2\u3055\u308c\u3066\u3044\u307e\u3059\u3002JVM\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u4e0a\u3067\u975e\u5e38\u306b\u4f3c\u305f\u3088\u3046\u306a\u52d5\u4f5c\u3092\u3057\u307e\u3059\uff08\u6b63\u78ba\u306b\u540c\u3058\u3068\u8a00\u3063\u3066\u3082\u5dee\u3057\u652f\u3048\u3042\u308a\u307e\u305b\u3093\uff09\u3002\u3053\u308c\u306b\u3088\u3063\u3066Java\u306f\u79fb\u690d\u6027\u304c\u3042\u308a\u3001\u4e88\u6e2c\u53ef\u80fd\u3067\u5b89\u5168\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001PHP\u306a\u3069\u306e\u4ed6\u306e\u8a00\u8a9e\u3068\u306f\u5bfe\u7167\u7684\u3067\u3042\u308a\u3001PHP\u30a4\u30f3\u30bf\u30fc\u30d7\u30ea\u30bf\u306f\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u304b\u3089\u591a\u304f\u306e\u30cd\u30a4\u30c6\u30a3\u30d6\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u4f9d\u5b58\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Java\u306f\u72ec\u81ea\u306e\u4eee\u60f3\u30de\u30b7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u3067\u305d\u306e\u3088\u3046\u306a\u9694\u96e2\u3092\u5b9f\u73fe\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u305d\u306e\u30d7\u30ed\u30bb\u30b9\u306f\u304b\u306a\u308a\u306e\u30e1\u30ac\u30d0\u30a4\u30c8\u306e\u30e1\u30e2\u30ea\u3092\u6d88\u8cbb\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001Java\u306f\u52b9\u7387\u7684\u306b\u30ea\u30bd\u30fc\u30b9\u3092\u7ba1\u7406\u3059\u308b\u305f\u3081\u306b\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u307e\u3059\u3002Java\u306f\u72ec\u81ea\u306e\u4eee\u60f3\u30de\u30b7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u306b\u95a2\u9023\u3059\u308b\u30ea\u30bd\u30fc\u30b9\u306e\u6d88\u8cbb\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u5927\u898f\u6a21\u3067\u8907\u96d1\u3067\u9577\u6642\u9593\u5b9f\u884c\u3055\u308c\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u304a\u3044\u3066\u512a\u308c\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u767a\u63ee\u3057\u307e\u3059\u3002<\/p>\n<p>\u8a00\u3044\u63db\u3048\u308b\u3068\u3001\u4ed6\u306e\u8a00\u8a9e\u3067\u306f\u753b\u9762\u306b\u8868\u793a\u3059\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3059\u308b\u305f\u3081\u306b\u3082\u3063\u3068\u7c21\u5358\u3067\u52b9\u7387\u7684\u306a\u65b9\u6cd5\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001Java\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u3068\u4e92\u63db\u6027\u306e\u3042\u308b\u8907\u96d1\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u304a\u3081\u3067\u3068\u3046\u3054\u3056\u3044\u307e\u3059\uff01\u6700\u521d\u306eJava\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u66f8\u3051\u307e\u3057\u305f\u306d\u3002<\/p>\n<p>Hello.java\u30d5\u30a1\u30a4\u30eb\u5185\u306e\u30b3\u30fc\u30c9\u3092\u5f15\u304d\u7d9a\u304d\u4f7f\u3063\u3066\u3001\u30c6\u30ad\u30b9\u30c8\u3092\u5909\u66f4\u3057\u305f\u5834\u5408\u3084\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u524a\u9664\u3057\u305f\u5834\u5408\u306e\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u305f\u3060\u3057\u3001Hello.java\u30d5\u30a1\u30a4\u30eb\u3092\u5909\u66f4\u3059\u308b\u305f\u3073\u306b\u30b3\u30fc\u30c9\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\uff08javac 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