单例模式
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/** * * 实现单例模式 * */public class SingleTon {//懒汉方式/*private static SingleTon singleTon;private SingleTon(){}public static SingleTon getInstance(){ if(singleTon == null){ synchronized(SingleTon.class){ if(singleTon == null){ singleTon = new SingleTon(); } } } return singleTon;}*///饱汉方式/*private static SingleTon singleTon = new SingleTon();private SingleTon(){}public static SingleTon getInstance(){return singleTon;}*///静态块方式private static SingleTon singleTon;private SingleTon(){}static{singleTon = new SingleTon();}public static SingleTon getInstance(){return singleTon;}}
