Java基础特殊应用
古老的代码，java代替goto,代码没有实际的意思，测试这种功能而已。注释解释啦功能。不知道还有没人会这样用。只是测试下这个功能。
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public class Test {public static String test1(String args){if(args.equals("a1")){if (!args.equals("a1")) {return "a other!";}return "a1";}else{if (!args.equals("b1")) {if (args.equals("b2")) {return "b2";}else{return "b other!";}}return "b1";}}public static String test2(String args){return args.equals("a1")?( args.equals("a1")?"a1":"a other!" ):( args.equals("b1")?"b1":(args.equals("b2")?"b2":"b other!") );}public static void main(String[] args) {System.out.println(test1("a1"));System.out.println(test2("a1"));System.out.println("-------------");System.out.println(test1("b1"));System.out.println(test2("b1"));System.out.println("===============");System.out.println(test1("a1d"));System.out.println(test2("a1d"));System.out.println("-------------");System.out.println(test1("b1d"));System.out.println(test2("b1d"));System.out.println("===============");System.out.println(test1("b2"));System.out.println(test2("b2"));System.out.println("-------------"); }}?对于if(if else) else( if else)更简单
三目运算符的效率和if else差不多，一亿次的运算也相差32毫秒左右，而加强的for比普通的for效率要高很多，不到一倍，本地的测试：
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int[] arrays = new int[10000];int[] results = new int[10000];long startTime = System.currentTimeMillis();for (int i = 0; i < arrays.length; i++) { for (int j = 0; j < arrays.length; j++) { results[j] = arrays[j]; } } long endTime = System.currentTimeMillis(); System.out.println("普通for循环：" + (endTime - startTime) + "毫秒"); startTime = System.currentTimeMillis(); for (int i : arrays) { for (int j : arrays) { results[j] = arrays[j]; } } endTime = System.currentTimeMillis(); System.out.println("加强for循环：" + (endTime - startTime) + "毫秒"); ??
结果如下：
普通for循环：360毫秒
加强for循环：250毫秒
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下面的代码集中方法是同一种效果
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public static void main(String[] args) {boolean boo1 = "415sdg".matches("\\^\\d \\$ ");// if it contains theboolean boo2 = "1515151515".matches("\\d*"); // if it not containsString a = "a";System.out.println(threetype(a));System.out.println(ifelse(a));System.out.println(ifelse(a));System.out.println(zhezhong(a));System.out.println(zhezhong2(a));a = "b";System.out.println("===================");System.out.println(threetype(a));System.out.println(ifelse(a));System.out.println(ifelse(a));System.out.println(zhezhong(a));System.out.println(zhezhong2(a));a = "c";System.out.println("===================");System.out.println(threetype(a));System.out.println(ifelse(a));System.out.println(ifelse(a));System.out.println(zhezhong(a));System.out.println(zhezhong2(a));a = "d";System.out.println("===================");System.out.println(threetype(a));System.out.println(ifelse(a));System.out.println(ifelse(a));System.out.println(zhezhong(a));System.out.println(zhezhong2(a));a = "d6%^&*(((()_++++|";System.out.println("===================");System.out.println(threetype(a));System.out.println(ifelse(a));System.out.println(ifelse(a));System.out.println(zhezhong(a));System.out.println(zhezhong2(a));}public static String threetype(String args) {return "a".equals(args) ? "a" : ("b".equals(args) ? "b" : ("c".equals(args) ? "c" : ("d".equals(args) ? "d" : "other!")));}public static String ifelse(String args) {String a = "";if ("a".equals(args)) {a = "a";} else {if ("b".equals(args)) {a = "b";} else {if ("c".equals(args)) {a = "c";} else {if ("d".equals(args)) {a = "d";} else {a = "other!";}}}}return a;}public static String zhezhong(String args) {String a = "";boolean boo = "a".equals(args) || "b".equals(args) || "c".equals(args)|| "d".equals(args);if (boo) {a = args;} else {a = "other!";}return a;}public static String zhezhong2(String args) {boolean boo = "a".equals(args) || "b".equals(args) || "c".equals(args)|| "d".equals(args);return boo ? args : "other!";}一种是if else太多看的人头晕，一种是代码让人看着苦涩难懂。一种是代码臃肿，一种是代码简洁。?那么你更喜欢那种呢？
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public String toman(String inrole){return "a".equals(inrole)? "a":("b".equals(inrole)?"b":("c".equals(inrole)?"c":("d".equals(inrole)?"d":"others！")));} 1 楼 Coder211 2011-03-01 不错，文章写的很好！不过多个三元运算符，严重的降低了可读性，很不好！