单例设计模式的代码
class Single { private int num; public void setNum(int num) { this.num = num; } public int getNum() { return num; } private Single () {} private static Single s = new Single(); public static Single getInstance() { return s; } } class SingleDemo { public static void main(String[] args) { Single s1 = Single.getInstance(); Single s2 = Single.getInstance(); s1.setNum(70); System.out.println(s2.getNum()); } }
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