1、父類作為方法的形參

語句：修飾符 父類類型 方法名(){}

2、父類作為方法返回值

語句：修飾符 void/返回值類型 方法名(父類類型 形參名){}

代碼例子：

動物類：

/*** @author Mr.Wang* 寵物類**/ public abstract class Animals {private int health;//健康值private int love;//親密度private String name;//名字public int getHealth() {return health;}public void setHealth(int health) {if(health<0||health>100){//System.out.println("健康值應該在0至100之間，默認值為60。");this.health=60;return;}this.health = health;}public int getLove() {return love;}public void setLove(int love) {this.love = love;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Animals() {}public Animals(int health, int love, String name) {if(health<0||health>100){System.out.println("健康值應該在0至100之間，默認值為60。");this.health=60;}else {this.health = health;}this.love = 60;this.name = name;}//寵物自白public void print() {System.out.println("寵物的自白：");System.out.println("我的名字叫"+this.getName()+"，健康值是"+this.getHealth()+",初始親密度為"+this.getLove());}public void play() {};public void Bath() {System.out.println("主人正在給"+this.getName()+"洗澡");} }

企鵝類：

/*** @author Mr.Wang* 企鵝類**/ public class Penguin extends Animals{private String sex;public Penguin() {}public Penguin(int health, int love, String name,String sex) {super(health, love, name);this.sex = sex;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public void print() {super.print();System.out.println("我是一只"+this.sex+this.getName());}public void play() { System.out.println("主人在跟"+this.getName()+"玩水");} }

狗狗類：

/*** @author Mr.Wang* 狗狗類**/ public class Dog extends Animals{private String type;public Dog() {}public Dog(int health, int love, String name,String type) {super(health, love, name);this.type = type;}public String getType() {return type;}public void setType(String type) {this.type = type;}public void print() {super.print();System.out.println("我是一只"+this.type);}public void play() {System.out.println("主人正在跟"+this.getName()+"玩飛盤");} }

主人類：

public class Master {public Animals toPlay(int num) {if(num == 1) {return new Dog(90,90,"皮蛋","拉布拉多");}else {return new Penguin(90,90,"小胡","Q仔");}}public void toBath(Animals animals) {animals.Bath();}}

測試類：

public class Text03 {public static void main(String[] args) {Master master = new Master();Animals animals = master.toPlay(1);animals.play();master.toBath(animals);} }

測試運行結果：

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轉載于:https://www.cnblogs.com/Dean-0/p/11203434.html

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