双重校验的单例模式

package com.loujin.utils;

/**
* 基于volatile的双重检查单例模式
* @author jin
*
*/
public class SaveDoubleCheckLocking {

private volatile static SaveDoubleCheckLocking instance;
public static SaveDoubleCheckLocking getInStance(){
if(instance==null){
synchronized (SaveDoubleCheckLocking.class) {
if(instance==null){
instance = new SaveDoubleCheckLocking();
}
}
}
return instance;
}
}