单例模式的最佳实现（Java）

Posted 2022-11-16 南飞的孤雁

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;
    

    public Object readResolve() 
        return getInstance();