面向对象复习题.doc

1. 按要求编写Java应用程序。（1）建立一个名叫Cat的类：属性：姓名、毛色、年龄 行为：显示姓名、喊叫（2）编写主类：创建一个对象猫，姓名为“妮妮”，毛色为“灰色”，年龄为2岁，在屏幕上输出该对象的毛色和年龄，让该对象调用显示姓名和喊叫两个方法。public class Cat String name;String color;int age;public void ShowNme()System.out.println(我叫+name);public void Bark()System.out.println(喵喵-);public class Test /* * param args */public static void main(String args) / TODO Auto-generated method stubCat cat=new Cat();=妮妮;cat.color=灰色;cat.age=2;cat.ShowNme();cat.Bark();System.out.println(毛色：+cat.color);System.out.println(年龄：+cat.age); 2. 按要求编写Java应用程序。（1）创建一个叫做People的类：属性：姓名、年龄、性别、身高行为：说话、计算加法、改名编写能为所有属性赋值的构造方法；（2）创建主类：创建一个对象：名叫“张三”，性别“男”，年龄18岁，身高1.80；让该对象调用成员方法：说出“你好！”public class People String name;int age;String sex;double height;public People(String name,int age,String sex,double height)=name;this.age=age;this.sex=sex;this.height=height;public void speak()System.out.println(你好!);public void add()public void rename()public class Test /* * param args */public static void main(String args) / TODO Auto-generated method stubPeople people=new People(张三,18,男,1.80);=张三;people.age=18;people.sex=男;people.height=1.80;people.speak();System.out.println(姓名：++n年龄:+people.age+n性别：+people.sex+n身高：+people.height);3利用接口做参数，写个计算器，能完成+-*/运算（1）定义一个接口Compute含有一个方法int computer(int n,int m);（2）设计四个类分别实现此接口，完成+-*/运算（3）设计一个类UseCompute，含有方法：public void useCom(Compute com, int one, int two)此方法要求能够：a用传递过来的对象调用computer方法完成运算 b输出运算的结果（4）设计一个测试类，调用UseCompute中的方法useCom来完成+-*/运算public interface Compute int computer(int n,int m);public class Compute1 implements Computepublic int computer(int n,int m)return n+m;public class Compute2 implements Computepublic int computer(int n,int m)return n-m;public class Compute3 implements Computepublic int computer(int n,int m)return n*m;public class Compute4 implements Computepublic int computer(int n,int m)return n/m;public class UseCompute public void useCom(Compute com,int one,int two)puter(one, two);public class Test /* * param args */public static void main(String args) / TODO Auto-generated method stubCompute c1=new Compute1();System.out.println(puter(10,2);Compute c2=new Compute2();System.out.println(puter(10, 2);Compute c3=new Compute3();System.out.println(puter(10, 2);Compute c4=new Compute4();System.out.println(puter(10, 2);4. 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。 (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。public class People extends Monkeypublic People(String s)super(s);public void speak()System.out.println(小样的，不错嘛！会说话了！);public void think()System.out.println(别说话！认真思考！);public class E /* * param args */public static void main(String args) / TODO Auto-generated method stubMonkey monkey=new Monkey(a);monkey.speak();People people=new People(a);people.speak();people.think();public class Monkey public Monkey(String s)public void speak()System.out.println(咿咿呀呀.);5. 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。public class Vehicle int wheels;double weight;public Vehicle(int wheels,double weight)this.wheels=wheels;this.weight=weight;public void print()System.out.println(汽车：+n车轮有+wheels+个+n车重：+weight+吨);public class Car extends Vehicleint loader;public Car(int wheels,double weight,int loader)super(wheels,weight);this.loader=loader;public void print()System.out.println(汽车：+n车轮有+wheels+个+n车重：+weight+吨+n载人数:+loader);public class Truck extends Cardouble payload;public Truck(int wheels,double weight,int loader,double payload)super(wheels,weight,loader);this.payload=payload;public void print()System.out.println(汽车：+n车轮有+wheels+个+n车重：+weight+吨+n载人数:+loader);public class Test /* * param args */public static void main(String args) / TODO Auto-generated method stubVehicle vi=new Vehicle(4,2);vi.print();Car car=new Car(4,5,3);car.print();Truck truck=new Truck(6,3,5,6);truck.print();6. 实现如下类之间的继承关系，并编写Music类来测试这些类。public class Instrument public void play()System.out.println(弹奏乐器);public class Wind extends Instrument public void play()System.out.println(弹奏Wind);public void play2()System.out.println(调用wind的play2);public class Brass extends Instrumentpublic void play()System.out.println(弹奏Brass);public void play2()Syste