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0922继承，练习题目-作业
1.实现如下类之间的继承关系，并编写Music类来测试这些类。
package workhome0922休息;public class People { protected double height; protected double weight; public double getHeight() { return height; } public void setHeight(double height) { this.height = height; } public double getWeight() { return weight; } public void setWeight(double weight) { this.weight = weight; } //方法 public void speakHello() { System.out.print("我是一个人"+" "); } public void averageHeight() { System.out.print("我有身高"+" "); } public void averageWeight() { System.out.println("我有体重"+" "); } }package workhome0922休息;public class ChinaPeople extends People { public void speakHello() { System.out.print("中国人"+" "); } public double averageHeight(double height) {// return height; this.height=height;//为什么要把height赋给父类的height？？？？？？ return this.height; } public double averageWeight(double weight) { this.weight=weight; return this.weight; } public void chinaGongFu() { System.out.println("中国功夫"+"太极拳"); }}package workhome0922休息;public class AmericanPeople extends People { public void speakHello() { System.out.print("美国人"); } public double averageHeight(double height) { this.height=height; return this.height; } public double averageWeight(double weight) { this.weight=weight; return this.weight; } public void americanBoxing() { System.out.println("美国功夫："+"直拳"); }}package workhome0922休息;public class Peopletest { public static void main(String[] args) { //实例化人 People p=new People(); p.speakHello(); p.averageHeight(); p.averageWeight(); //实例化中国人 ChinaPeople c=new ChinaPeople(); c.speakHello(); System.out.print(""+"身高:"+c.averageHeight(171.2)); System.out.print(" "+"体重:"+c.averageWeight(125)+" "); c.chinaGongFu(); //实例化美国人 AmericanPeople a=new AmericanPeople(); a.speakHello(); System.out.print(" "+"身高:"+a.averageHeight(180)); System.out.print(" "+"体重:"+a.averageWeight(160)+" "); a.americanBoxing(); }}
2.创建如下三个类：（People类中的三个方法分别输出一些信息，ChinaPeople
和AmericanPeople类重写父类的三个方法）。
package workhome0922休息;public class Instrument { //方法-输出:弹奏乐器 public void play() { System.out.println("弹奏乐器"); }}package workhome0922休息;public class Wind extends Instrument { //方法1-输出：弹奏Wind public void play() { System.out.println("弹奏Wind"); } //方法2-输出：调用Wind的play2 public void play2() { System.out.println("调用Wind的play2"); }}package workhome0922休息;public class Brass extends Instrument { //方法1-输出：弹奏brass public void play() { System.out.println("弹奏brass"); } //方法2-输出：调用brass的play2 public void play2() { System.out.println("调用brass的play2"); }}package workhome0922休息;public class Music { //调用对象i的play方法 public static void tune(Instrument i) { i.play(); } public static void main(String[] args) { Wind w=new Wind(); Music.tune(w); w.play2(); Brass b=new Brass(); Music.tune(b); }}
3.编写一个Java应用程序，该程序包括3个类：Monkey类、People类和主类E。
要求：
(1) Monkey类中有个构造方法：Monkey (String s)，并且有个public void speak()
方法，在speak方法中输出“咿咿呀呀......”的信息。
(2)People类是Monkey类的子类，在People类中重写方法speak(),在speak方法
中输出“小样的，不错嘛！会说话了！”的信息。
(3)在People类中新增方法void think()，在think方法中输出“别说话！认真思考！”的信息。
(4)在主类E的main方法中创建Monkey与People类的对象类测试这2个类的功能。
package workhome2;public class Monkey { //构造方法 Monkey(String s) { super(); System.out.println(s+1); } Monkey(int ss) { System.out.println(ss); } //方法 public void speak() { System.out.println("咿咿呀呀......"); }}package workhome2;public class People extends Monkey { //继承构造方法 public People(String s) { super(s); System.out.println(s+10); } //重写父类方法speak public void speak() { System.out.println("小样的，不错嘛！会说话了"); } //新增方法 public void think() { System.out.println("别说话！认真思考！"); }}package workhome2;public class E { public static void main(String[] args) { //创建Monkey对象 Monkey m=new Monkey("10"); m.speak(); //创建People对象 People p=new People("10"); p.speak(); p.think(); }}
4.定义类Human，具有若干属性和功能；定义其子类Man、Woman；
在主类Test中分别创建子类、父类和上转型对象，并测试其特性。
package workhome3;public class Human { //人的属性 public String leg; public String foot; public String getLeg() { return leg; } public void setLeg(String leg) { this.leg = leg; } public String getFoot() { return foot; } public void setFoot(String foot) { this.foot = foot; } //人的方法 public void run() { System.out.println("可以跑"); } public void jump() { System.out.println("可以跳"); } public int Int(int a) { a=a+1; return a; }}package workhome3;public class Man extends Human { //男人的方法 public void run() { System.out.println("可以跑快"); } public void jump() { System.out.println("可以跳高"); } public void eat() { System.out.println("吃饭睡觉打豆豆"); } }package workhome3;public class Woman extends Human { //女人的方法 public void run() { System.out.println("可以跑慢"); } public void jump() { System.out.println("可以跳矮"); }}package workhome3;public class humantest { public static void main(String[] args) { //向上转型 Human h1=new Man(); h1.setFoot("人有两条腿"); System.out.println(h1.getFoot()); h1.run(); System.out.println(h1.Int(10)); //向下转型 Man m1=(Man)h1; m1.setFoot("男人有两条比女人长的腿"); System.out.println(m1.getFoot()); m1.jump(); System.out.println(m1.Int(10)); m1.eat(); }}
6.按要求编写一个Java应用程序：
（1）定义一个类，描述一个矩形，包含有长、宽两种属性，和计算面积方法。
（2）编写一个类，继承自矩形类，同时该类描述长方体，具有长、宽、高属性，和计算体积的方法。
（3）编写一个测试类，对以上两个类进行测试，创建一个长方体，定义其长、宽、高，输出其底面积和体积。
package workhome4;public class jivxing {// 包含有长、宽两种属性，和计算面积方法。 private double chang; private double kuan; public double getChang() { return chang; } public void setChang(double chang) { this.chang = chang; } public double getKuan() { return kuan; } public void setKuan(double kuan) { this.kuan = kuan; } //方法 public double mianji(double chang,double kuan) { this.chang=chang; this.kuan =kuan; return this.chang*this.kuan; }}package workhome4;public class jivxing2 extends jivxing { private double gao; public double getGao() { return gao; } public void setGao(double gao) { this.gao = gao; } public double tiji(double chang,double kuan,double gao) { this.gao=gao; return super.mianji(chang, kuan)*this.gao; }}package workhome4;public class test { public static void main(String[] args) { // TODO Auto-generated method stub jivxing2 j=new jivxing2(); System.out.println(j.mianji(1, 2)); System.out.println(j.tiji(1, 2, 3)); }}
7.
编写一个Java应用程序，设计一个汽车类Vehicle，包含的属性有车轮个数
wheels和车重weight。小车类Car是Vehicle的子类，其中包含的属性有载人数
loader。卡车类Truck是Car类的子类，其中包含的属性有载重量payload。每个
类都有构造方法和输出相关数据的方法。最后，写一个测试类来测试这些类的功
能。
package workhome4;public class Vehicle { //wheels和车重weight private int wheel;//轮胎数量 private double weight;//车重 public int getWheel() { return wheel; } public void setWheel(int wheel) { this.wheel = wheel; } public double getWeight() { return weight; } public void setWeight(double weight) { this.weight = weight; } //构造方法 public Vehicle(int wheel,double weight) { super(); this.wheel=wheel; this.weight=weight; } //方法 public void vv() { System.out.print("轮胎数："+this.wheel+" "+"车重："+this.weight+" "); }}package workhome4;public class Car extends Vehicle { private int loader;//载人数 public int getLoader() { return loader; } public void setLoader(int loader) { this.loader = loader; } public Car(int wheel,double weight,int loader) { super(wheel,weight); this.loader=loader; } //方法 public void cc() { System.out.println(); super.vv(); System.out.print("和载人数"+this.loader+" "); } }package workhome4;public class Truck extends Car { private double payload;//载重量 public double getPayload() { return payload; } public void setPayload(double payload) { this.payload = payload; } public Truck(int wheel, double weight, int loader, double payload) { super(wheel, weight, loader); this.payload=payload; }//方法 public void tt() { super.cc(); System.out.println("载重量"+this.payload+" "); } }package workhome4;public class cartest { public static void main(String[] args) { Vehicle v=new Vehicle(4,99999); v.vv(); Car c=new Car(4,888888,3); c.cc(); Truck t=new Truck(4,777777,6,90000.888); t.tt(); } }
8.编写一个Shape类，具有属性：周长和面积；
定义其子类三角形和矩形，分别具有求周长的方法。
定义主类E，在其main方法中创建三角形和矩形类的对象，
并赋给Shape类的对象a、b，使用对象a、b来测试其特性。
0922继承，练习题目-作业
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