2018-08-14

最新推荐文章于 2020-10-15 16:55:21 发布

liuqun69

最新推荐文章于 2020-10-15 16:55:21 发布

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public class Singleton {  
    private static class SingletonHolder {  
        private static final Singleton INSTANCE = new Singleton();  
    }  
    private Singleton (){}  
    public static final Singleton getInstance() {  
        return SingletonHolder.INSTANCE; 
    }  
}