PP喜的博客

策略模式+Enum策略接口public interface Strategy { int calc(int a, int b);}Context，传入不同的策略，完成不同实现public class Context { private Strategy strategy; Context(Strategy strategy) { this.strategy = strategy; } public int work(int a, in

饿汉模式使用类的时候就已经将对象创建完毕，常见的方法就是直接new实例化。public class MyObject { private static MyObject instance = new MyObject(); private MyObject() { } public static MyObject getInstance() { ...