{"id":24339,"date":"2024-03-17T01:06:15","date_gmt":"2024-03-16T16:06:15","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%80%8c%e3%80%8d%e3%81%a8%e3%80%8cequals%e3%80%8d%e3%82%92%e6%ad%a3%e3%81%97%e3%81%8f%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99\/"},"modified":"2024-03-22T08:55:16","modified_gmt":"2024-03-21T23:55:16","slug":"java%e3%81%a7%e3%80%8c%e3%80%8d%e3%81%a8%e3%80%8cequals%e3%80%8d%e3%82%92%e6%ad%a3%e3%81%97%e3%81%8f%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%80%8c%e3%80%8d%e3%81%a8%e3%80%8cequals%e3%80%8d%e3%82%92%e6%ad%a3%e3%81%97%e3%81%8f%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99\/","title":{"rendered":"Java\u3067\u300c==\u300d\u3068\u300cequals\u300d\u3092\u6b63\u3057\u304f\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"

Java\u3067\u306f\u3001==\u3068equals\u306f\u4e21\u65b9\u3068\u3082\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u3067\u3059\u304c\u3001\u305d\u308c\u3089\u306f\u7570\u306a\u308b\u76ee\u7684\u3068\u6319\u52d5\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

    \n
  1. \u6f14\u7b97\u5b50:<\/li>\n
  2. \u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306e\u6bd4\u8f03\u306f\u3001\u5024\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3067\u3059\u3002<\/li>\n
  3. \u53c2\u7167\u30c7\u30fc\u30bf\u578b\u3067\u306f\u3001\u6bd4\u8f03\u3055\u308c\u308b\u306e\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u304c\u540c\u3058\u304b\u3069\u3046\u304b\u3067\u3042\u308a\u3001\u3064\u307e\u308a\u540c\u3058\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3067\u3059\u3002<\/li>\n
  4. \u4f8b\u3048\u3070\u3001<\/li>\n
  5. int a = 5, b = 5;
    \nSystem.out.println(a == b); \/\/ \u7d50\u679c: trueString str1 = “hello”;
    \nString str2 = “hello”;
    \nString str3 = new String(“hello”);
    \nSystem.out.println(str1 == str2); \/\/ \u7d50\u679c: true
    \nSystem.out.println(str1 == str3); \/\/ \u7d50\u679c: false<\/li>\n
  6. equals() \u30e1\u30bd\u30c3\u30c9\uff1a<\/li>\n
  7. \u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306b\u5bfe\u3057\u3066\u306f\u3001equals() \u30e1\u30bd\u30c3\u30c9\u306f\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3055\u308c\u305a\u3001\u5f15\u304d\u7d9a\u304d == \u3067\u6bd4\u8f03\u3055\u308c\u307e\u3059\u3002<\/li>\n
  8. \u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u53c2\u7167\u30c7\u30fc\u30bf\u578b\u306e\u5834\u5408\u3001equals\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3068==\u306f\u540c\u3058\u3067\u3001\u53c2\u7167\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/li>\n
  9. \u901a\u5e38\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6bd4\u8f03\u30ed\u30b8\u30c3\u30af\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u305f\u3081\u306b\u3001equals() \u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002equals() \u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u969b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002- \u53cd\u5c04\u6027\uff1a\u3069\u3093\u306a\u975enull\u306e\u53c2\u7167 x \u306b\u5bfe\u3057\u3066\u3082\u3001x.equals(x) \u306ftrue\u3092\u8fd4\u3059\u3079\u304d\u3067\u3059\u3002
    \n– \u5bfe\u79f0\u6027\uff1a\u3069\u3093\u306a\u975enull\u306e\u53c2\u7167 x \u3068 y \u306b\u5bfe\u3057\u3066\u3082\u3001x.equals(y) \u304ctrue\u3092\u8fd4\u3059\u5834\u5408\u3001y.equals(x) \u3082true\u3092\u8fd4\u3059\u3079\u304d\u3067\u3059\u3002
    \n– \u63a8\u79fb\u6027\uff1a\u3069\u3093\u306a\u975enull\u306e\u53c2\u7167 x\u3001y\u3001z \u306b\u5bfe\u3057\u3066\u3082\u3001x.equals(y) \u304ctrue\u304b\u3064 y.equals(z) \u304ctrue\u306e\u5834\u5408\u3001x.equals(z) \u3082true\u3092\u8fd4\u3059\u3079\u304d\u3067\u3059\u3002
    \n– \u4e00\u8cab\u6027\uff1a\u3069\u3093\u306a\u975enull\u306e\u53c2\u7167 x\u3001y \u306b\u5bfe\u3057\u3066\u3082\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u60c5\u5831\u304c\u5909\u66f4\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001x.equals(y) \u3092\u8907\u6570\u56de\u547c\u3073\u51fa\u3057\u3066\u3082\u540c\u3058\u7d50\u679c\u304c\u8fd4\u308b\u3079\u304d\u3067\u3059\u3002
    \n– \u3069\u3093\u306a\u975enull\u306e\u53c2\u7167 x \u306b\u5bfe\u3057\u3066\u3082\u3001x.equals(null) \u306ffalse\u3092\u8fd4\u3059\u3079\u304d\u3067\u3059\u3002<\/li>\n
  10. \u4f8b\u3048\u3070\u3001<\/li>\n
  11. public class Person {
    \nprivate String name;
    \nprivate int age;\/\/ Constructor and other methods omitted<\/p>\n

    @Override
    \npublic boolean equals(Object obj) {
    \nif (this == obj) {
    \nreturn true;
    \n}
    \nif (obj == null || getClass() != obj.getClass()) {
    \nreturn false;
    \n}
    \nPerson person = (Person) obj;
    \nreturn age == person.age && Objects.equals(name, person.name);
    \n}
    \n}<\/p>\n

    \u2192Person\u30af\u30e9\u30b9\u3067\u306f\u3001\u540d\u524d\u3068\u5e74\u9f62\u3092\u6bd4\u8f03\u3059\u308bequals\u30e1\u30bd\u30c3\u30c9\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n

  12. \u5229\u7528\u4f8b:<\/li>\n
  13. Person person1 = new Person(“Alice”, 20);
    \nPerson person2 = new Person(“Alice”, 20);
    \nPerson person3 = new Person(“Bob”, 25);System.out.println(person1.equals(person2)); \/\/ \u7d50\u679c true
    \nSystem.out.println(person1.equals(person3)); \/\/ \u7d50\u679c false<\/li>\n<\/ol>\n

    \u307e\u3068\u3081\uff1a<\/p>\n

      \n
    1. \u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306e\u5024\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001\u307e\u305f\u3001\u53c2\u7167\u30c7\u30fc\u30bf\u578b\u306e\u53c2\u7167\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/li>\n
    2. equals()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u53c2\u7167\u578b\u30c7\u30fc\u30bf\u306e\u5024\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u304c\u3001\u5177\u4f53\u7684\u306a\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u306b\u57fa\u3065\u3044\u3066\u518d\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

      Java\u3067\u306f\u3001==\u3068equals\u306f\u4e21\u65b9\u3068\u3082\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u3067\u3059\u304c\u3001\u305d\u308c\u3089\u306f\u7570\u306a\u308b\u76ee\u7684\u3068\u6319\u52d5\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002 \u6f14\u7b97\u5b50: \u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306e\u6bd4\u8f03\u306f\u3001\u5024\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3067\u3059\u3002 \u53c2\u7167\u30c7\u30fc\u30bf\u578b\u3067\u306f\u3001\u6bd4\u8f03\u3055\u308c\u308b\u306e\u306f\u30aa\u30d6\u30b8 […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-24339","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJava\u3067\u300c==\u300d\u3068\u300cequals\u300d\u3092\u6b63\u3057\u304f\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u300c\u300d\u3068\u300cequals\u300d\u3092\u6b63\u3057\u304f\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067\u300c==\u300d\u3068\u300cequals\u300d\u3092\u6b63\u3057\u304f\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u306f\u3001==\u3068equals\u306f\u4e21\u65b9\u3068\u3082\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u3067\u3059\u304c\u3001\u305d\u308c\u3089\u306f\u7570\u306a\u308b\u76ee\u7684\u3068\u6319\u52d5\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002 \u6f14\u7b97\u5b50: \u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306e\u6bd4\u8f03\u306f\u3001\u5024\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3067\u3059\u3002 \u53c2\u7167\u30c7\u30fc\u30bf\u578b\u3067\u306f\u3001\u6bd4\u8f03\u3055\u308c\u308b\u306e\u306f\u30aa\u30d6\u30b8 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u300c\u300d\u3068\u300cequals\u300d\u3092\u6b63\u3057\u304f\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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