总结：java设计模式之----单例模式singeton

总结：没什么好说的，单例模式就是创建全局唯一的实例

//懒汉模式
public class Singleton {
    private  Singleton(){ }
    private  static  Singleton instance = null;
    public  static synchronized Singleton getInstance() {
        if (instance == null){
            instance = new Singleton();
        }
        return  instance;
    }
}

//恶汉模式
class Singleton1 {
    private  Singleton1(){ }
    private  static Singleton1 instance1 = new Singleton1();
    public  static  Singleton1 getInstance() {
        return  instance1;
    }
}