java面试题-Java基础部分-程序 04 淩亂°似流年 2022-01-21 05:37 217阅读 0赞 编写写一个 Singleton //饱汉模式 public class SingleTon { private SingleTon(){} //实例化放在静态代码块里可提高程序的执行效率,但也可能更占用空间 private final static SingleTon instance =new SingleTon(); public static SingleTon getInstance(){ return instance; } } //饥汉模式 public class SingleTon { private SingleTon(){} private static instance = null;//newSingleTon(); public static synchronized SingleTon getInstance(){ if(instance == null) instance = new SingleTon(); return instance; } }
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