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单子模式的双重检测

andy_wang_5

发贴: 101
积分: 14

于 2007-09-25 11:28

public class LazySingleton {
public static LazySingleton m_instance = null;
/**
*私有的默认构造函数,保证外界没办法直接实列化。
*/
private LazySingleton() {}
/**
*静态工厂方法，返回此类的惟一实列
*/
public static LazySingleton getInstance() {
if (m_instance == null) {
//more than one threads might be here!!!
synchronized (LazySingleton.class) {
if (m_instance == null) {
m_instance = new LazySingleton();
}
}
}
return m_instance;
}
}

为什么如上的双重检测不适用于java,而使用与C++ ?请高手指点。

鹰行折翼再盼凌云

作者	Re:单子模式的双重检测 [Re:andy_wang_5]
JiafanZhou 版主发贴: 736 积分: 61	于 2007-09-25 17:11 C++ uses a different thread scheduling mechanism which is different from the one in Java in essence. When I was a kid I used to pray every night for a new bike. Then I realized that The Lord doesn't work that way, so I stole one and asked him to forgive me.

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