单例模式实现

    public static void main(String[] args) {
        Singleton single = Singleton.getInstance();
        System.out.println(single3.about());
    }
}

    public static void main(String[] args) {
        FruitFactory factory = new FruitFactory();
        Fruit apple = factory.create(Apple.class);
        apple.getColor();
        Fruit oringe = factory.create(Apple.class);
        oringe.getColor();
    }

    public static void main(String[] args) {
        Fruit apple = new Apple();   // Fruit 是一个抽象类（水果类模板），所有水果都继承它
        apple.getColor();
        Fruit oringe = new Oringe();
        oringe.getColor();
    }

代理模式详解

自己不能处理时交给下一级处理

Handle A_handle = new Handle();
Handle B_handle = new Handle();
Handle C_handle = new Handle();
A.setNextHandle(B);
B.setNextHandle(C);

Component c1 = new ConcreteComponent (); //首先创建需要被装饰的原始对象(即要被装饰的对象)  
Decorator decoratorA = new ConcreteDecoratorA(c1); //给对象透明的增加功能A并调用  
decoratorA .operation();  // decoratorA 对c1对象进行了装饰，

interface TwoSocket { // 二孔插头
    public void twoSocket();
}

class ThreeSocket {  // 三孔插头
    public void threeSocket() {
        System.out.println("i'm three socket");
    }
}

public class Adapter extends ThreeSocket implements TwoSocket{ // 适配器,同时有二孔和三孔
    public void twoSocket() { // 即使使用二孔插头也能插三孔插头
        super.threeSocket();
    }

    public static void main(String[] args) {
        TwoSocket t = new Adapter(); // 使用适配器
        t.twoSocket();
    }
}

观察者模式详解

门面模式详解