《设计模式》读懂UML类图

一、类中的主要关系

继承、实现、组合、聚合、依赖、关联

二、UML类图

三、代码实现

public class H2O {

}

public class O2 {

}

public interface Animal {

    public boolean life=false;//是否有生命

    public void eat(H2O h2o,O2 o2);//水和氧气 --依赖

}

public class Dog implements Animal { //--实现

    @Override

    public void eat(H2O h2o, O2 o2) {

        System.out.println("Bird:eat");

    }

}

public class Bird implements Animal { //--实现

    public Wing wing; //翅膀--组合

    public Bird(Wing wing){

        this.wing=wing;

    }

    @Override

    public void eat(H2O h2o, O2 o2) {

        System.out.println("Bird:eat");

    }

    public void layEggs(){

        System.out.println("Bird:layeggs");

    }

}

public class Wing {

    private String size;

    private String color;//0 black 1 red 2 white

    public Wing(String size,String color){

        this.size=size;

        this.color=color;

    }

}

public class Goose extends Bird{ //--继承

    public Goose(Wing wing) {

        super(wing);

    }

    public void layEggs(){

        System.out.println("Bird:layeggs");

    }

}

public class Penguin extends Bird{//--继承

    //企鹅的生存和天气关系很大 --关联

    private  Climate climate;

    public Penguin(Wing wing) {

        super(wing);

    }

    public void layEggs(){

        System.out.println("Bird:layeggs");

    }

}

public class Climate {

}

public class GooseGroup {

    private List<Goose> gooseList; //--聚合

    public void vFly(){

        System.out.println("GooseGroup:vFly");

    }

    public void straightFly(){

        System.out.println("GooseGroup:straightFly");

    }

}

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原创文章，转载请务必将下面这段话置于文章开头处（保留超链接）。
本文转发自程序媛说事儿，原文链接https://www.cnblogs.com/abc8023/p/10910741.html

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