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Integer

Integer i = 100; Integer j = 100; Integer m = new Integer(100); Integer x = 200; Integer y = 200; System.out.println(i == j); System.out.println(i == m); System.out.println(x == y); 为什么i==j是true;x==y是false? 解答:有些primitive值会被unbox成常量、不可变的wrapper对象,-127到127之间的值是不可变的wrapper类型,虚拟机对i和j使用了同样的对象实例及内存 ...
<?php $myStr = 789696;                       // An integer. $myVar = 2;                            // Another integer. $myStr = "This is my favorite band: "; // Strings are more fun. $myStr = $myStr . "U" . $myVar;        // Doing this is OK, too. echo "$myVar\n"; ?&g ...
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