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单例模式（防止new 反射 clone 序列化破坏）

package com.tank.cn.singleton;import java.io.Serializable;public class Singleton implements Serializable{    private static Singleton instance = new Singleton();    private boolean isdoublecallStructorflag = false;    //防止反射破坏单例    private Singleton(){        if(!isdoublecallStructorflag){            isdoublecallStructorflag = !isdoublecallStructorflag;        }else{            try {                throw new Exception("不能通过反射创建单例！");            } catch (Exception e) {                e.printStackTrace();            }        }    }    public static Singleton getInstance(){        return instance;    }    //防止反序列化    private Singleton readResolve(){        return instance;    }    //防止colne    @Override    protected Object clone() throws CloneNotSupportedException {        return instance;    }}

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