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| [size=1em][size=1em]class Single{
[size=1em] //一加载类,对象就已经存在了
[size=1em] private static Single s = new Single();
[size=1em] private Single(){}
[size=1em] public static Single getInstance(){
[size=1em] return s ;
[size=1em] }
[size=1em]}
[size=1em]class SingleDemo{
[size=1em] public static void main(String[] args){
[size=1em] Single s1 = Single.getInstance();
[size=1em] Single s2 = Single. getInstance();
[size=1em] System.out.println(s1 == s2);
[size=1em] }
[size=1em]}
|