设计模式的一些日常记录

public class Singleton {

    private static final Singleton singleton = new  Singleton();

    private Singleton(){ }

    //通过该方法获得实例对象
    public static Singleton getSigleton(){
        return singleton;
    }

    public static void  talk(){
        System.out.println("我被执行了");
    }

}


public class Client {

    public static void main(String[] args) {
        Singleton singleton1 = Singleton.getSigleton();
        Singleton singleton2 = Singleton.getSigleton();
        System.out.println(singleton1 ==  singleton2);
        System.out.println(singleton1.equals(singleton2));
    }
}

执行结果：
true
true

/**
 * 抽象产品类
 */
public abstract class Human {
    //不同种族的肤色不同
    public abstract void getColor();

    //不同种族语言不同
    public abstract void getTalk();

}

public class BlackHuman extends Human {


    @Override
    public void getColor() {
        System.out.println("黑色人种的皮肤是黑色的");
    }

    @Override
    public void getTalk() {
        System.out.println("黑色人种通用语言英语");
    }
}


public class YellowHuman extends Human {


    @Override
    public void getColor() {
        System.out.println("黄色人种的皮肤是黄色的");
    }

    @Override
    public void getTalk() {
        System.out.println("黄色人种通用语言是普通话");
    }
}


/**
 * 抽象人类创建工厂
 *
 */
public abstract class AbstractFactory {
    //获取人类对象
    public abstract <T extends Human> T createHuman(Class c);

}

/**
 * 具体工厂类
 */
public class HumanFactory extends AbstractFactory {

    @Override
    public <T extends Human> T createHuman(Class c) {
        //定义一个生产的人种
        Human  human = null;
        try {
            human = (T)(Class.forName(c.getName())).newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return  (T)human;
    }
}

public class Client {
    public static void main(String[] args) {
        //创建一个人类工厂
        AbstractFactory factory = new HumanFactory();

        BlackHuman blackHuman = factory.createHuman(BlackHuman.class);
        blackHuman.getColor();
        blackHuman.getTalk();

        YellowHuman yellowHuman = factory.createHuman(YellowHuman.class);
        yellowHuman.getColor();
        yellowHuman.getTalk();
    }
}