题目内容
Java 双层校验锁单列模式
题目答案
//双层校验锁单列模式
public class Singleton{
private static Singleton singleton ;
private Singleton() {}
public static Singleton getInstance() {
if(singleton==null) {
synchronized (singleton) {
if(singleton == null) {
singleton=new Singleton();
}
}
}
return singleton;
}
}
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