{"id":5347,"date":"2010-09-25T14:00:09","date_gmt":"2010-09-25T05:00:09","guid":{"rendered":"http:\/\/www.sssg.org\/blogs\/hiro345\/?p=5347"},"modified":"2010-09-25T14:06:43","modified_gmt":"2010-09-25T05:06:43","slug":"%e9%96%8f%e5%b9%b4%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6%e6%b0%97%e3%81%ab%e3%81%aa%e3%81%a3%e3%81%a6%e8%aa%bf%e3%81%b9%e3%81%9f","status":"publish","type":"post","link":"https:\/\/www.hiro345.net\/blogs\/hiro345\/archives\/5347.html","title":{"rendered":"\u958f\u5e74\u306b\u3064\u3044\u3066\u6c17\u306b\u306a\u3063\u3066\u8abf\u3079\u305f"},"content":{"rendered":"

\u958f\u5e74\u306b\u3064\u3044\u3066\u6c17\u306b\u306a\u3063\u305f\u306e\u3067\u8abf\u3079\u3066\u3057\u307e\u3063\u305f\u3002Wikipedia\u4fbf\u5229\u3002<\/p>\n

\u66a6\u306b\u3064\u3044\u3066\u306f\u3001\u3044\u308d\u3044\u308d\u3068\u7f60\u304c\u591a\u3044\u306e\u3067\u3001\u6c17\u306b\u306a\u3063\u305f\u3068\u304d\u306b\u78ba\u8a8d\u3092\u3057\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u300c\u660e\u6cbb – Wikipedia<\/a>\u300d\u3092\u8aad\u3081\u3070\u308f\u304b\u308a\u307e\u3059\u304c\u3001\u660e\u6cbb5\u5e74\u306b\u306f12\u67083\u65e5\u304b\u308912\u670831\u65e5\u307e\u3067\u306e29\u65e5\u9593\u304c\u5b58\u5728\u3057\u307e\u305b\u3093\u3002<\/p>\n

\u307e\u3041\u3001\u305d\u308c\u306f\u3044\u3044\u3068\u3057\u3066\u3001\u300c\u958f\u5e74 – Wikipedia<\/a>\u300d\u3092\u307f\u305f\u3089\u3001\u30e6\u30ea\u30a6\u30b9\u66a6\u3001\u30b0\u30ec\u30b4\u30ea\u30aa\u66a6\u3001\u65e5\u672c\u306b\u304a\u3051\u308b\u958f\u5e74\u306e\u6839\u62e0\u6cd5\u3001 \u4fee\u6b63\u30e6\u30ea\u30a6\u30b9\u66a6\u3068\u3044\u3063\u305f\u3042\u305f\u308a\u3092\u6c17\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u305d\u3046\u3067\u3059\u3002\u65e5\u672c\u3060\u3068\u300c\u65e5\u672c\u306b\u304a\u3051\u308b\u958f\u5e74\u306e\u6839\u62e0\u6cd5\u300d\u3092\u6839\u62e0\u3068\u3057\u3066\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u305f\u65b9\u304c\u826f\u3055\u305d\u3046\u3067\u3059\u3002\u30b0\u30ec\u30b4\u30ea\u30aa\u66a6\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u3088\u3046\u306a\u306e\u3067\u3001\u300cyear%4 == 0 && year%100 != 0 || year%400 == 0\u300d\u3067\u8a08\u7b97\u3057\u3066\u826f\u3055\u305d\u3046\u3067\u3059\u304c…<\/p>\n

\u3061\u306a\u307f\u306b\u30012800\u5e742\u670828\u65e5\u306e\u6b21\u306e\u65e5\u304b\u3089\u3001\u30b0\u30ec\u30b4\u30ea\u30aa\u66a6\u3068\u4fee\u6b63\u30e6\u30ea\u30a6\u30b9\u66a6\u3067\u306f\u300c\u305a\u308c\u300d\u304c\u751f\u3058\u308b\u3088\u3046\u306a\u306e\u3067\u3059\u304c\u3001\u77e5\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n

\u3055\u3066\u3001Java\u3067\u5b9f\u88c5\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u300c&&\u300d\u306f\u300c||\u300d\u3088\u308a\u3082\u512a\u5148\u9806\u4f4d\u304c\u9ad8\u3044\u306e\u3067\u5fc5\u8981\u306a\u3044\u306e\u3067\u3059\u304c\u3001\u3069\u3061\u3089\u304c\u5148\u306b\u8a08\u7b97\u3055\u308c\u308b\u306e\u304b\u308f\u304b\u308a\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u306b\u300c( )\u300d\u3067\u660e\u793a\u7684\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

$ cat LeapYear.java
\npublic class LeapYear {
\n  public static void main(String[] args) {
\n    int y = Integer.parseInt(args[0]);
\n    boolean result = (y % 4 == 0) && ((y % 100 != 0) || (y % 400 == 0));
\n    System.out.println(result);
\n  }
\n}\n<\/div>\n

\u3064\u3044\u3067\u306b\u3001\u3053\u3093\u306a\u30c6\u30b9\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u3066\u307f\u307e\u3057\u305f\u30021\u884c\u3067\u8a08\u7b97\u5f0f\u3092\u8868\u3057\u3066\u3044\u308bSimple\u30af\u30e9\u30b9\u306e\u65b9\u304c\u3044\u3044\u306e\u3067\u3059\u304c\u3001\u5b9a\u7fa9\u3069\u304a\u308a\u306b\u66f8\u304d\u4e0b\u308d\u3059\u3068\u3001Basic\u30af\u30e9\u30b9\u306e\u3088\u3046\u306a\u611f\u3058\u306b\u306a\u308a\u307e\u3059\u3002\u52d5\u4f5c\u78ba\u8a8d\u306e\u305f\u3081\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001JUnit\u3067\u5b9f\u88c5\u3059\u308b\u306e\u304c\u666e\u901a\u3067\u3059\u304c\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u304b\u8ffd\u52a0\u3059\u308b\u306e\u304c\u9762\u5012\u3060\u3063\u305f\u306e\u3067\u666e\u901a\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n

$ cat LeapYear.java
\npublic class LeapYear {
\n  interface Checker {
\n    boolean isLeap(int y);
\n  }
\n  static class Simple implements Checker {
\n    public boolean isLeap(int y) {
\n      return (y % 4 == 0) && ((y % 100 != 0) || (y % 400 == 0));
\n    }
\n  }
\n  static class Basic implements Checker {
\n    public boolean isLeap(int y) {
\n      boolean result = false;
\n      if (y % 4 == 0) {
\n        result = true;
\n        if (y % 100 == 0) {
\n          result = false;
\n          if (y % 400 == 0) {
\n            result = true;
\n          }
\n        }
\n      }
\n      return result;
\n    }
\n  }
\n  public static void main(String[] args) {
\n    LeapYear.Checker app1 = new LeapYear.Simple();
\n    LeapYear.Checker app2 = new LeapYear.Basic();
\n    System.out.println("1900:false," + app2.isLeap(1900));
\n    System.out.println("1996:true ," + app2.isLeap(1996));
\n    System.out.println("1999:false," + app2.isLeap(1999));
\n    System.out.println("2000:true ," + app2.isLeap(2000));
\n    System.out.println("2001:false," + app2.isLeap(2001));
\n    System.out.println("2004:true ," + app2.isLeap(2004));
\n    int start = 1900;
\n    int end = 2800;
\n    for (int y = 1900 ; y<=2800 ; y+=4) {
\n      boolean result1 = app1.isLeap(y);
\n      boolean result2 = app2.isLeap(y);
\n      String s = result1 ? ", " : ",";
\n      if (result1 != result2) {
\n        System.out.println(y + ":" + result1 + s + result2);
\n      }
\n    }
\n  }
\n}\n<\/div>\n

\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u901a\u308a\u3002\u52d5\u4f5c\u78ba\u8a8d\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n

1900:false,false
\n1996:true ,true
\n1999:false,false
\n2000:true ,true
\n2001:false,false
\n2004:true ,true\n<\/div>\n

\u307e\u3041\u3001\u3061\u3087\u3063\u3068\u3057\u305f\u304a\u904a\u3073\u3067\u3059\u306d…<\/p>\n","protected":false},"excerpt":{"rendered":"

\u958f\u5e74\u306b\u3064\u3044\u3066\u6c17\u306b\u306a\u3063\u305f\u306e\u3067\u8abf\u3079\u3066\u3057\u307e\u3063\u305f\u3002Wikipedia\u4fbf\u5229\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2],"tags":[],"class_list":["post-5347","post","type-post","status-publish","format-standard","hentry","category-general","category-java"],"_links":{"self":[{"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/posts\/5347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/comments?post=5347"}],"version-history":[{"count":3,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/posts\/5347\/revisions"}],"predecessor-version":[{"id":5379,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/posts\/5347\/revisions\/5379"}],"wp:attachment":[{"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/media?parent=5347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/categories?post=5347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/tags?post=5347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}