public class Singleton {
// Private constructor prevents instantiation from other classes private Singleton() { }
/** * SingletonHolder is loaded on the first execution of Singleton.getInstance() * or the first access to SingletonHolder.INSTANCE, not before. */ private static class SingletonHolder {
public static final Singleton INSTANCE =
new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.INSTANCE;
}
}
99%的Java程序员实现不了一个完美的单例模式，看看Wiki上给出的最佳实现： 通过单例模式全面了解Double-checked locking以及并发时候的锁的问题：
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