Java设计模式 Singleton

一些资源管理器常常设计成单例模式

1.懒汉（线程安全）

//懒汉
public class Singleton {
    private static Singleton singleton;
    private Singleton() {}
    public static synchronized Singleton getSingleton() {
        if (singleton == null) {
            singleton = new Singleton();
        }
        return singleton;
    }
}

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2.饿汉

//饿汉
public class Singleton {
    private static final Singleton singleton = new Singleton();
    private Singleton () {}
    public static Singleton getSingleton() {
        return singleton;
    }
}

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