Java\u306eString\u30af\u30e9\u30b9\u306f\u3001\u6700\u3082\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u308b\u30af\u30e9\u30b9\u306e\u4e00\u3064\u3067\u3059\u3002Java\u306eString\u30af\u30e9\u30b9\u306f\u3001java.lang\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
Java\u306eString\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n
Java\u3067\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u304c\u3001\u4ee5\u4e0b\u306b\u3044\u304f\u3064\u304b\u4eba\u6c17\u306e\u3042\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
<\/p>\n
<\/p>\n
\u4e8c\u91cd\u5f15\u7528\u7b26\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3059\u308b\u3068\u3001JVM\u306fString\u30d7\u30fc\u30eb\u3092\u691c\u7d22\u3057\u3066\u3001\u540c\u3058\u5024\u3067\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u4ed6\u306eString\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u307e\u3059\u3002\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u3001\u305d\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059\u3060\u3051\u3067\u3001\u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4f5c\u6210\u3057\u307e\u305b\u3093\u3002\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u5024\u3067\u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3066String\u30d7\u30fc\u30eb\u306b\u4fdd\u5b58\u3057\u307e\u3059\u3002<\/p>\n
new\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b
\n\u901a\u5e38\u306eJava\u30af\u30e9\u30b9\u3068\u540c\u3058\u3088\u3046\u306b\u3001new\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002String\u30af\u30e9\u30b9\u3067\u306f\u3001char\u914d\u5217\u3001byte\u914d\u5217\u3001StringBuffer\u3001StringBuilder\u304b\u3089String\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u3044\u304f\u3064\u304b\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002
\nString str = new String(“abc”);
\nchar[] a = {‘a’, ‘b’, ‘c’};
\nString str2 = new String(a);<\/p>\n
String\u30af\u30e9\u30b9\u306f\u3001equals()\u30e1\u30bd\u30c3\u30c9\u3068equalsIgnoreCase()\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u30662\u3064\u306e\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u306e\u5024\u3092\u6bd4\u8f03\u3057\u3066\u30012\u3064\u306e\u6587\u5b57\u5217\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u30022\u3064\u306e\u6587\u5b57\u5217\u304c\u7b49\u3057\u3044\u5834\u5408\u306ftrue\u3092\u8fd4\u3057\u3001\u7b49\u3057\u304f\u306a\u3044\u5834\u5408\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.string.examples;\r\n\r\n\/**\r\n * Java String Example\r\n * \r\n * @author scdev\r\n *\r\n *\/\r\npublic class StringEqualExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/creating two string object\r\n\t\tString s1 = \"abc\";\r\n\t\tString s2 = \"abc\";\r\n\t\tString s3 = \"def\";\r\n\t\tString s4 = \"ABC\";\r\n\t\t\r\n\t\tSystem.out.println(s1.equals(s2));\/\/true\r\n\t\tSystem.out.println(s2.equals(s3));\/\/false\r\n\t\t\r\n\t\tSystem.out.println(s1.equals(s4));\/\/false;\r\n\t\tSystem.out.println(s1.equalsIgnoreCase(s4));\/\/true\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
true\r\nfalse\r\nfalse\r\ntrue\r\n<\/code><\/pre>\nString\u30af\u30e9\u30b9\u306fComparable\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u304a\u308a\u3001compareTo()\u30e1\u30bd\u30c3\u30c9\u3068compareToIgnoreCase()\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30012\u3064\u306e\u6587\u5b57\u5217\u3092\u8f9e\u66f8\u7684\u306b\u6bd4\u8f03\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6bd4\u8f03\u306e\u305f\u3081\u306b\u3001\u4e21\u65b9\u306e\u6587\u5b57\u5217\u306fUnicode\u306e\u5024\u306b\u5909\u63db\u3055\u308c\u3001\u6574\u6570\u5024\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u6587\u5b57\u5217\u304c\u7b49\u3057\u3044\u5834\u5408\u306f\u30bc\u30ed\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u30bc\u30ed\u3088\u308a\u3082\u5927\u304d\u3044\u304b\u5c0f\u3055\u3044\u6574\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.examples;\r\n\r\n\/**\r\n * Java String compareTo Example\r\n * \r\n * @author scdev\r\n *\r\n *\/\r\npublic class StringCompareToExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tString a1 = \"abc\";\r\n\t\tString a2 = \"abc\";\r\n\t\tString a3 = \"def\";\r\n\t\tString a4 = \"ABC\";\r\n\t\t\r\n\t\tSystem.out.println(a1.compareTo(a2));\/\/0\r\n\t\tSystem.out.println(a2.compareTo(a3));\/\/less than 0\r\n\t\tSystem.out.println(a1.compareTo(a4));\/\/greater than 0\r\n\t\tSystem.out.println(a1.compareToIgnoreCase(a4));\/\/0\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u3001\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
0\r\n-3\r\n32\r\n0\r\n<\/code><\/pre>\n\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001String compareTo \u306e\u4f8b\u3092\u8aad\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n
Java\u306e\u6587\u5b57\u5217\u30e1\u30bd\u30c3\u30c9<\/h3>\n
\u4f8b\u984c\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f7f\u3063\u3066\u3001\u3044\u304f\u3064\u304b\u306e\u4eba\u6c17\u306e\u3042\u308bString\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\n- \n
split()<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\n- \n
Java\u306eString split()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5206\u5272\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002split()\u30e1\u30bd\u30c3\u30c9\u306b\u306f2\u3064\u306e\u30d0\u30ea\u30a2\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\nsplit(String regex)\uff1a\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5206\u5272\u3057\u3001\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002
\nsplit(String regex, int limit)\uff1a\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5206\u5272\u3057\u3001\u914d\u5217\u306e\u8981\u7d20\u3092\u6307\u5b9a\u3055\u308c\u305f\u5236\u9650\u306b\u3088\u3063\u3066\u5236\u9650\u3057\u307e\u3059\u3002\u6307\u5b9a\u3055\u308c\u305f\u5236\u9650\u304c2\u306e\u5834\u5408\u3001\u30e1\u30bd\u30c3\u30c9\u306f\u30b5\u30a4\u30ba2\u306e\u914d\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.examples;<\/p>\n
\/**
\n* Java String split example
\n*
\n* @author scdev
\n*
\n*\/
\npublic class StringSplitExample {<\/p>\n
public static void main(String[] args) {<\/p>\n
String s = “a\/b\/c\/d”;
\nString[] a1 = s.split(“\/”);
\nSystem.out.println(“\u6b63\u898f\u8868\u73fe\u306e\u307f\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5206\u5272\uff1a”);
\nfor (String string : a1) {
\nSystem.out.println(string);
\n}
\nSystem.out.println(“\u5236\u9650\u3092\u6307\u5b9a\u3057\u3066\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5206\u5272\uff1a”);
\nString[] a2 = s.split(“\/”, 2);
\nfor (String string : a2) {
\nSystem.out.println(string);
\n}
\n}<\/p>\n
}<\/p>\n
\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u7d50\u679c\u306f\uff1a
\n\u6b63\u898f\u8868\u73fe\u306e\u307f\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5206\u5272\uff1a
\na
\nb
\nc
\nd
\n\u5236\u9650\u3092\u6307\u5b9a\u3057\u3066\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5206\u5272\uff1a
\na
\nb\/c\/d<\/p>\n
contains(CharSequence s)
\nJava\u306eString contains()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u304c\u6307\u5b9a\u3055\u308c\u305f\u6587\u5b57\u5217\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u542b\u3093\u3067\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u304c\u6307\u5b9a\u3055\u308c\u305f\u6587\u5b57\u5217\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u542b\u3093\u3067\u3044\u308b\u5834\u5408\u306ftrue\u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002
\npackage com.scdev.examples;<\/p>\n
\/**
\n* Java String contains() Example
\n*
\n* @author scdev
\n*
\n*\/
\npublic class StringContainsExample {<\/p>\n
public static void main(String[] args) {
\nString s = “Hello World”;<\/p>\n
System.out.println(s.contains(“W”));\/\/true
\nSystem.out.println(s.contains(“X”));\/\/false
\n}<\/p>\n
}<\/p>\n
\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u7d50\u679c\u306f\uff1a
\ntrue
\nfalse<\/p>\n
length()
\nJava\u306eString length()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u8fd4\u3057\u307e\u3059\u3002
\npackage com.scdev.examples;<\/p>\n
\/**
\n* Java String length
\n*
\n* @author scdev
\n*
\n*\/
\npublic class StringLengthExample {<\/p>\n
public static void main(String[] args) {<\/p>\n
String s1 = “abc”;
\nString s2 = “abcdef”;
\nString s3 = “abcdefghi”;<\/p>\n
System.out.println(s1.length());\/\/3
\nSystem.out.println(s2.length());\/\/6
\nSystem.out.println(s3.length());\/\/9<\/p>\n
}<\/p>\n
}<\/p>\n
replace()
\nJava\u306eString replace()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u306e\u7279\u5b9a\u306e\u90e8\u5206\u3092\u4ed6\u306e\u6587\u5b57\u5217\u3067\u7f6e\u304d\u63db\u3048\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002replace()\u30e1\u30bd\u30c3\u30c9\u306b\u306f4\u3064\u306e\u30d0\u30ea\u30a2\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
replace(char oldChar, char newChar)\uff1a\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u5185\u306e\u3059\u3079\u3066\u306eoldChar\u306e\u51fa\u73fe\u3092newChar\u3067\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002
\nreplace(CharSequence target, CharSequence replacement)\uff1a\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u5185\u306etarget\u30ea\u30c6\u30e9\u30eb\u3092replacement\u30ea\u30c6\u30e9\u30eb\u3067\u305d\u308c\u305e\u308c\u7f6e\u63db\u3057\u307e\u3059\u3002
\nreplaceAll(String regex, String replacement)\uff1a\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6b63\u898f\u8868\u73fe\u306b\u4e00\u81f4\u3059\u308b\u90e8\u5206\u6587\u5b57\u5217\u306e\u3059\u3079\u3066\u306e\u51fa\u73fe\u3092\u6307\u5b9a\u3055\u308c\u305f\u7f6e\u63db\u6587\u5b57\u5217\u3067\u7f6e\u63db\u3057\u307e\u3059\u3002
\nreplaceFirst(String regex, String replacement)\uff1a\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6b63\u898f\u8868\u73fe\u306b\u4e00\u81f4\u3059\u308b\u6700\u521d\u306e\u90e8\u5206\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3055\u308c\u305f\u7f6e\u63db\u6587\u5b57\u5217\u3067\u7f6e\u63db\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.examples;<\/p>\n
\/**
\n* Java String replace
\n*
\n* @author scdev
\n*
\n*\/
\npublic class StringReplaceExample {<\/p>\n
public static void main(String[] args) {<\/p>\n
\/\/replace(char oldChar, char newChar)
\nString s = “Hello World”;
\ns = s.replace(‘l’, ‘m’);
\nSystem.out.println(“l\u3092m\u306b\u7f6e\u304d\u63db\u3048\u305f\u5f8c\uff1a”);
\nSystem.out.println(s);<\/p>\n
\/\/replaceAll(String regex, String replacement)
\nString s1 = “Hello scdev, Hello scdev”;
\ns1 = s1.replaceAll(“Hello”, “Hi”);
\nSystem.out.println(“\u7f6e\u63db\u5f8c\uff1a”);
\nSystem.out.println(s1);<\/p>\n
\/\/replaceFirst(String regex, String replacement)
\nString s2 = “Hello guys, Hello world”;
\ns2 = s2.replaceFirst(“Hello”, “Hi”);
\nSystem.out.println(“\u7f6e\u63db\u5f8c\uff1a”);
\nSystem.out.println(s2);<\/p>\n
}<\/p>\n
}<\/p>\n
\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u7d50\u679c\u306f\uff1a
\nl\u3092m\u306b\u7f6e\u304d\u63db\u3048\u305f\u5f8c\uff1a
\nHemmo Wormd
\n\u7f6e\u63db\u5f8c\uff1a
\nHi scdev, Hi scdev
\n\u7f6e\u63db\u5f8c\uff1a
\nHi guys, Hello world<\/p>\n
format()
\nJava\u306eString format()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u3092\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002java String format()\u30e1\u30bd\u30c3\u30c9\u306b\u306f2\u3064\u306e\u30d0\u30ea\u30a2\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
format(Locale l, String format, Object… args)\uff1a\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u30ed\u30b1\u30fc\u30eb\u3001\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3001\u304a\u3088\u3073\u5f15\u6570\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3057\u307e\u3059\u3002
\nformat(String format, Object… args)\uff1a\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u5f15\u6570\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.examples;<\/p>\n
import java.util.Locale;<\/p>\n
\/**
\n* Java String format
\n*
\n* @author scdev
\n*
\n*\/
\npublic class StringFormatExample {<\/p>\n
public static void main(String[] args) {<\/p>\n
String s = “scdev.com”;
\n\/\/ %s\u306f\u6587\u5b57\u5217\u3092\u8ffd\u52a0\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059
\nSystem.out.println(String.format(“\u3053\u308c\u306f%s\u3067\u3059”, s));<\/p>\n
\/\/Locale.US\u3092\u4f7f\u7528
\nSystem.out.println(String.format(Locale.US, “%f”, 3.14));
\n}
\n}<\/p>\n
\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u7d50\u679c\u306f\uff1a
\n\u3053\u308c\u306fscdev.com\u3067\u3059
\n3.140000<\/p>\n
substring()
\n\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u57fa\u3065\u3044\u3066\u6587\u5b57\u5217\u306e\u4e00\u90e8\u3092\u8fd4\u3057\u307e\u3059\u3002
\npackage com.scdev.examples;<\/p>\n
\/**
\n* Java String substring
\n*
\n*\/
\npublic class StringSubStringExample {<\/p>\n
public static void main(String[] args) {<\/p>\n
String s = “This is scdev.com”;
\ns = s.substring(8,18);
\nSystem.out.println(s);
\n}
\n}<\/p>\n
\u6587\u5b57\u5217\u306e\u7d50\u5408<\/h3>\n
Java\u3067\u306f\u3001\u6587\u5b57\u5217\u306e\u9023\u7d50\u306f\u975e\u5e38\u306b\u57fa\u672c\u7684\u306a\u64cd\u4f5c\u3067\u3059\u3002\u6587\u5b57\u5217\u306f\u3001\u300c+\u300d\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u304b\u3001concat\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u9023\u7d50\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
package com.scdev.examples;\r\n\r\n\/**\r\n * Java String concatenation\r\n * \r\n * @author scdev\r\n *\r\n *\/\r\npublic class StringConcatExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tString s1 = \"Hello\";\r\n\t\tString s2 = \"World\";\r\n\t\tString s3 = s1 + s2;\r\n\t\t\/\/using + operator\r\n\t\tSystem.out.println(\"Using + operator: \");\r\n\t\tSystem.out.println(s3);\r\n\t\t\r\n\t\t\/\/using concat method\r\n\t\tSystem.out.println(\"Using concat method: \");\r\n\t\tSystem.out.println(s1.concat(s2));\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n
Using + operator: \r\nHelloWorld\r\nUsing concat method: \r\nHelloWorld\r\n<\/code><\/pre>\nJava\u3067\u306e\u6587\u5b57\u5217\u9023\u7d50\u306b\u95a2\u3059\u308b\u3088\u308a\u8a73\u3057\u3044\u60c5\u5831\u306f\u3001\u3053\u306e\u6295\u7a3f\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
Java\u306eString\u30d7\u30fc\u30eb<\/h3>\n
\u30e1\u30e2\u30ea\u7ba1\u7406\u306f\u3001\u3069\u3093\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u3068\u3063\u3066\u3082\u6700\u3082\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002Java\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306f\u3001\u4ed6\u306e\u30af\u30e9\u30b9\u3068\u306f\u5c11\u3057\u3060\u3051\u7570\u306a\u308a\u307e\u3059\u3002Java\u3092\u3088\u308a\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u3082\u306e\u306b\u3059\u308b\u305f\u3081\u306b\u3001JVM\u306f\u6587\u5b57\u5217\u306e\u305f\u3081\u306e\u7279\u5225\u306a\u30e1\u30e2\u30ea\u9818\u57df\u3067\u3042\u308b\u300cString Constant Pool\u300d\u3092\u5c0e\u5165\u3057\u307e\u3057\u305f\u3002\u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb\u3092\u4f5c\u6210\u3059\u308b\u969b\u3001\u305d\u308c\u304c\u3059\u3067\u306b\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u5185\u306b\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u3082\u3057\u5b58\u5728\u3057\u3066\u3044\u308c\u3070\u3001\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u5185\u306e\u65e2\u5b58\u306e\u6587\u5b57\u5217\u306e\u53c2\u7167\u3092\u8fd4\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u984c\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
package com.scdev.examples;\r\n\r\n\/**\r\n * Java String Pool Example\r\n * \r\n *\/\r\npublic class StringPoolExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tString a = \"abc\";\r\n\t\tString b = \"abc\";\r\n\t\tString c = \"def\";\r\n\t\t\r\n\t\t\/\/same reference\r\n\t\tif (a==b) {\r\n\t\t\tSystem.out.println(\"Both string refer to the same object\");\r\n\t\t}\r\n\t\t\r\n\t\t\/\/different reference\r\n\t\tif (a==c) {\r\n\t\t\tSystem.out.println(\"Both strings refer to the same object\");\r\n\t\t}else {\r\n\t\t\tSystem.out.println(\"Both strings refer to the different object\");\r\n\t\t}\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u3001\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n
Both string refer to the same object\r\nBoth strings refer to the different object\r\n<\/code><\/pre>\nJava\u306eString Pool\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u306e\u6295\u7a3f\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
String\u30af\u30e9\u30b9\u306eintern()\u30e1\u30bd\u30c3\u30c9<\/h3>\n
\u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3059\u308b\u3068\u3001\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u306b\u4f5c\u6210\u3055\u308c\u307e\u3059\u304c\u3001\u540c\u3058\u5024\u3092\u6301\u3064\u6587\u5b57\u5217\u3092new\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u4f5c\u6210\u3057\u305f\u5834\u5408\u3001\u30d2\u30fc\u30d7\u30e1\u30e2\u30ea\u304b\u3089\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u306b\u79fb\u52d5\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304b\uff1f\u3053\u306e\u5834\u5408\u3001intern()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6b63\u6e96\u8868\u73fe\u3092\u8fd4\u3057\u307e\u3059\u3002new\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u4f5c\u6210\u3055\u308c\u305f\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066intern()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u30d7\u30fc\u30eb\u306b\u540c\u3058\u5024\u3092\u6301\u3064String\u304c\u65e2\u306b\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u5b58\u5728\u3059\u308b\u5834\u5408\u3001\u30d7\u30fc\u30eb\u304b\u3089\u305d\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3057\u307e\u3059\u3002\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u30d7\u30fc\u30eb\u306b\u540c\u3058\u5185\u5bb9\u3092\u6301\u3064\u65b0\u3057\u3044String\u3092\u4f5c\u6210\u3057\u3066\u53c2\u7167\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.examples;\r\n\r\n\/**\r\n * Java String intern\r\n * \r\n * @author scdev\r\n *\r\n *\/\r\npublic class StringInternExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tString s1 = \"scdev\";\r\n\t\tString s2 = \"scdev\";\r\n\t\tString s3 = new String(\"scdev\");\r\n\t\t\r\n\t\tSystem.out.println(s1==s2);\/\/true\r\n\t\tSystem.out.println(s2==s3);\/\/false\r\n\t\t\r\n\t\tString s4 = s3.intern();\r\n\t\tSystem.out.println(s1==s4);\/\/true\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u8a73\u3057\u304f\u306f\u3001Java\u306eString intern\u30e1\u30bd\u30c3\u30c9\u306b\u95a2\u3059\u308b\u3053\u306e\u6295\u7a3f\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u6587\u5b57\u5217\u306e\u4e0d\u5909\u6027\u306e\u5229\u70b9<\/h3>\n
\u6587\u5b57\u5217\u304c\u4e0d\u5909\u306e\u30af\u30e9\u30b9\u3067\u3042\u308b\u3053\u3068\u306e\u5229\u70b9\u306e\u3044\u304f\u3064\u304b\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059:<\/p>\n
\n- \n
\u6587\u5b57\u5217\u306e\u5b9a\u6570\u30d7\u30fc\u30eb\u306f\u3001\u3057\u305f\u304c\u3063\u3066\u30e1\u30e2\u30ea\u3092\u7bc0\u7d04\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\n- \n
\u5909\u66f4\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u78ba\u4fdd\u3055\u308c\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\n- \n
\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\u30af\u30e9\u30b9\u306e\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3067\u3059\u3002<\/ol>\nSting\u30a4\u30df\u30e5\u30fc\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u30e1\u30ea\u30c3\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u306e\u6295\u7a3f\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
Java 8\u306eString join()\u30e1\u30bd\u30c3\u30c9<\/h2>\n
Java 8\u3067\u306f\u3001String\u30af\u30e9\u30b9\u306b\u65b0\u3057\u3044static\u306ajoin()\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u533a\u5207\u308a\u6587\u5b57\u306e\u30b3\u30d4\u30fc\u3068\u3001CharSequence\u306e\u8981\u7d20\u306e\u30b3\u30d4\u30fc\u3092\u7d50\u5408\u3057\u305f\u65b0\u3057\u3044String\u3092\u8fd4\u3057\u307e\u3059\u3002\u7c21\u5358\u306b\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n
List<String> words = Arrays.asList(new String[]{\"Hello\", \"World\", \"2019\"});\r\nString msg = String.join(\" \", words);\r\nSystem.out.println(msg);\r\n<\/code><\/pre>\nOutput: \u3053\u3093\u306b\u3061\u306f\u4e16\u754c2019\u5e74<\/p>\n
Java 9\u306e\u6587\u5b57\u5217\u30e1\u30bd\u30c3\u30c9<\/h2>\n
Java 9\u306e\u30ea\u30ea\u30fc\u30b9\u3067String\u30af\u30e9\u30b9\u306b\u306f2\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u305d\u308c\u3089\u306fcodePoints()\u3068chars()\u3067\u3059\u3002\u3069\u3061\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3082IntStream\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u3001\u305d\u306e\u4e0a\u3067\u3044\u304f\u3064\u304b\u306e\u64cd\u4f5c\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u7c21\u5358\u306b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
String s = \"abc\";\r\n\r\ns.codePoints().forEach(x -> System.out.println(x));\r\n\r\ns.chars().forEach(x -> System.out.println(x));\r\n<\/code><\/pre>\n\u51fa\u529b\uff1a<\/p>\n
97\r\n98\r\n99\r\n97\r\n98\r\n99\r\n<\/code><\/pre>\nJava 11\u3067\u306f\u3001String\u30af\u30e9\u30b9\u306b\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/h2>\n
Java 11\u306e\u30ea\u30ea\u30fc\u30b9\u3067\u306f\u3001String\u30af\u30e9\u30b9\u306b\u591a\u304f\u306e\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\n- isBlank() – returns true if the string is empty or contains only white space codepoints, otherwise false.<\/li>\n
- lines() – returns a stream of lines extracted from this string, separated by line terminators.<\/li>\n
- strip(), stripLeading(), stripTrailing() – for stripping leading and trailing white spaces from the string.<\/li>\n
- repeat() – returns a string whose value is the concatenation of this string repeated given number of times.<\/li>\n<\/ul>\n
\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u305f\u5177\u4f53\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
package com.scdev.strings;\r\n\r\nimport java.util.List;\r\nimport java.util.stream.Collectors;\r\n\r\n\/**\r\n * JDK 11 New Functions in String class\r\n * \r\n * @author scdev\r\n *\r\n *\/\r\npublic class JDK11StringFunctions {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ isBlank()\r\n\t\tString s = \"abc\";\r\n\t\tSystem.out.println(s.isBlank());\r\n\t\ts = \"\";\r\n\t\tSystem.out.println(s.isBlank());\r\n\r\n\t\t\/\/ lines()\r\n\t\tString s1 = \"Hi\\nHello\\rHowdy\";\r\n\t\tSystem.out.println(s1);\r\n\t\tList lines = s1.lines().collect(Collectors.toList());\r\n\t\tSystem.out.println(lines);\r\n\r\n\t\t\/\/ strip(), stripLeading(), stripTrailing()\r\n\t\tString s2 = \" Java, \\tPython\\t \";\r\n\t\tSystem.out.println(\"#\" + s2 + \"#\");\r\n\t\tSystem.out.println(\"#\" + s2.strip() + \"#\");\r\n\t\tSystem.out.println(\"#\" + s2.stripLeading() + \"#\");\r\n\t\tSystem.out.println(\"#\" + s2.stripTrailing() + \"#\");\r\n\r\n\t\t\/\/ repeat()\r\n\t\tString s3 = \"Hello\\n\";\r\n\t\tSystem.out.println(s3.repeat(3));\r\n\t\ts3 = \"Co\";\r\n\t\tSystem.out.println(s3.repeat(2));\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u51fa\u529b:<\/p>\n
false\r\ntrue\r\nHi\r\nHello\r\nHowdy\r\n[Hi, Hello, Howdy]\r\n# Java, \tPython\t #\r\n#Java, \tPython#\r\n#Java, \tPython\t #\r\n# Java, \tPython#\r\nHello\r\nHello\r\nHello\r\n\r\nCoCo\r\n<\/code><\/pre>\nJava\u306eString\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u3001\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u6587\u5b57\u5217\u64cd\u4f5c\u306e\u4f8b\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n
\u5f0a\u793e\u306eGitHub\u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089\u3001\u3082\u3063\u3068\u591a\u304f\u306e\u6587\u5b57\u5217\u306e\u4f8b\u3092\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u53c2\u7167\uff1aAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u306eString\u30af\u30e9\u30b9\u306f\u3001\u6700\u3082\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u308b\u30af\u30e9\u30b9\u306e\u4e00\u3064\u3067\u3059\u3002Java\u306eString\u30af\u30e9\u30b9\u306f\u3001java.lang\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002 Java\u306eString Basically, string is a […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-617","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n
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