实验2 信息133-魏达-2013013272 (2).doc

实验2 面向对象编程（Part one）实验目的掌握Java程序面向对象编程的基本架构，会运用面向对象的思想编写Java程序。信息133 魏达 2013013272实验题1 阅读如下程序，完成思考题。class CCircle double pi; double radius; double getRadius() return radius; void setCircle(double r, double p) pi=p; radius=r; public class Ex2_1 public static void main(String args) CCircle cir1=new CCircle(); cir1.setCircle(2.0,3.1416); System.out.println(radius=+cir1.getRadius(); 基本要求 运行程序并观察运行结果。 思考问题 试述程序中主要语句的作用。运行结果：radius=2.0主要语句的作用：class CCircle double pi; double radius; /变量声明 double getRadius() /方法定义 return radius; void setCircle(double r, double p) /方法定义 pi=p; radius=r; public class Ex2_1 public static void main(String args) CCircle cir1=new CCircle(); /创建对象 cir1.setCircle(2.0,3.1416); /调用方法 System.out.println(radius=+cir1.getRadius(); /输出结果实验题2 设计一个用来描述汽车的类Car，使用类的非静态成员变量来表示汽车的车主姓名name、当前的速率speed:1. 创建构造函数为成员变量赋初值。2. 使用类的非静态成员方法来表示改车主姓名changeName操作, 并通过该方法显示修改后的车主名称。3. 使用类的非静态成员方法来表示改变汽车的速率changSpeed操作，并通过该方法显示修改后的车速。4. 使用类的非静态成员方法来表示停车stop操作，并通过该方法显示停车后的车速。5. 创建一个Car类的对象，初始状态时，车主名称是自己的名字，speed=0。6. 分别调用这三个方法，更改车名为朋友的名字，车速为20，停车车速为0，并且得到如下的结果：public class Test2 public static void main(String args) Car car=new Car();car.setName(好友);car.setSpeed(20);System.out.println(当前速度为：+car.getSpeed();System.out.println(车主为：+car.getName();System.out.println(停车后，车速为：+car.stop();car.changName(好人啊);car.changSpeed(50);System.out.println(当前速度为：+car.getSpeed();System.out.println(车主为：+car.getName();System.out.println(停车后，车速为：+car.stop();class CarString name;double speed;public String getName() return name;public void setName(String name) = name;public double getSpeed() return speed;public void setSpeed(double speed) this.speed = speed;public String changName(String name)=name;return ;public double changSpeed(double speed)this.speed=speed;return this.speed;public double stop()speed=0;return speed;实验题3 定义一个类MyProgram，包含两个属性：一个是private的整型属性data、一个是private的String类型的属性str，封装这两个属性的四个方法setData（）和getData（）、setStr( )和getStr（）；将这两个属性转变为字符串的方法是toStr（）。编写程序，使用MyProgram类，实现数据的访问和修改，并调用toStr（）方法显示该类的属性。基本要求 编写完整程序。思考问题 试述程序中各个方法的作用。程序：public class Test3 public static void main(String args) MyProgram program=new MyProgram();program.setData(20);program.setStr(bac); System.out.println(getData():+program.getData(); System.out.println(getStr():+program.getStr();System.out.println(toStr():+program.toStr();class MyProgramprivate int data;private String str;public void setData(int data)this.data=data;public int getData()/System.out.println(+data);return data;public void setStr(String str)this.str=str;public String getStr()return str;public String toStr()String str_one;str_one= str+data;return str_one;程序中各个方法的作用：setData():设置data属性getData():获取data属性setStr():设置str属性getStr():获取str属性toStr():将data和str转换为字符串实验题4定义一个类实现银行帐户的概念，包括的变量有帐号和存款余额，包括的方法有存款、取款、查询余额和”显示帐号”。定义主类，创建帐户类的对象，并完成相应操作。提示：关键代码如下：public int getleftmoney()return leftmoney;public void savemoney(double money)leftmoney+=money;public void getmoney(double money)if(money=leftmoney)leftmoney-=money;elseSystem.out.println(只能取：+leftmoney);bankaccount ba=new bankaccount(888123,1000);ba.savemoney(21000);System.out.println(存入21000元后余额为：+ba.getleftmoney();ba.getmoney(11500);System.out.println(11500元后余额为：+ba.getleftmoney();程序：public class Test4 public static void main(String args) BankAccount ba=new BankAccount(888123,1000);ba.savemoney(21000);System.out.println(存入21000元后余额为：+ba.getleftmoney();ba.getmoney(11500);System.out.println(取款11500元后余额为：+ba.getleftmoney();class BankAccount private int leftmoney;private int account;public int getAccount() return account;public int getleftmoney() return leftmoney;public void savemoney(double money) leftmoney += money;public void getmoney(double money) if (money 0) this.width=w; public double getWidth() return width; public void setLength (double h) if(length 0) this.length =h; public double getLength () return length; 程序：Rectangle.javapublic class Rectangle double width,length; public void setWidth(double w) if(w 0) this.width=w; public double getWidth() return width; public void setLength (double h) if(h 0) this.length =h; public double getLength () return length; Cuboid.javapublic class Cuboid Rectangle rect;int height;Cuboid(Rectangle rect,int height)this.rect=rect;this.height=height;public void setBottomWidth(double a)rect.setWidth(a);public double getBottomWidth()return rect.getWidth();public void setBottomLength(double b)rect.setLength(b);public double getBottomLength()return rect.length; public double getVolme() double m; double n; m=rect.getWidth(); n=rect.getLength();return m*n*height; 实验题6 有图形类的父类Shape，参照圆Circle类补充完整正方性Square和三角形Triangle类，并分析运行结果。class Shape void draw() void erase() class Circle extends Shape void draw() System.out.println(Circle.draw();void erase() System.out.println(Circle.erase();class Square extends Shape void draw() void erase() class Triangle extends Shape void draw() void erase() public class Shapes public static Shape randShape() switch(int)(Math.random() * 3) default: / To quiet the compiler case 0: return new Circle();case 1: return new Square();case 2: return new Triangle(); public static void main(String args) Shape s = new Shape3; / Fill up the array with shapes:for(int i = 0; i s.length; i+)si = randShape(); / Make polymorphic method calls:for(int i = 0; i s.length; i+)si.draw(); 程序：package TestFive;class Shape void draw() void erase() class Circle extends Shape void draw() System.out.println(Circle.draw();void erase() System.out.println(Circle.erase();class Square extends Shape void draw() System.out.println(Squre.draw();void erase() System.out.println(Square.erase();class Triangle extends Shape void draw() System.out.println(Triangle.draw();void erase() System.out.println(Triangle.erase();public class Shapes public static Shape randShape() switch (int) (Math.random() * 3) default: / To quiet the compilercase 0:return new Circle();case 1:return new Square();case 2:return new Triangle();public static void main(String args) Shape s = new Shape3; / Fill up the array with shapes:for (int i = 0; i s.length; i+)si = randShape(); / Make polymorphic method calls:for (int i = 0; i s.length; i+)si.draw();实验题7有两个类：MobileManagement和Mobile，分别描述如图所示两部手机名称及价格，类MobileManagement在包.nwsuaf.jp.p3中，而Mobile在包.nwsuaf.jp.p3.data中。它们代码如下。运行MobileManagement.java，你应该看到如图所示结果。基本要求 在空白处填写相关代码并修改上面程序，使程序能够显示两部手机的价格和数量，运行结果如图所示。E365, 1780 RMB M330, 1450 RMB手机及价格图程序Mobile.java源代码：public class Mobile /* Holds the name of the mobile. */private String name;/* Holds the price of the mobile. */private float price;/* Creates a new mobile object. */public Mobile(String name, float price) = name;this.price = price;/* Gets the name of the mobile. */public String getName() return name;/* Gets the price of the mobile. */Public float getPrice() return price;程序MobileManagement.java源代码：import javax.swing.JOptionPane;public class MobileManagement /* Defines the entry point of the application. */public static void main(String args) / Creates two mobile phone objects.Mobile mobile1 = new Mobile(E365, 1780); Mobile mobile2 = new Mobile(M330, 1450);/ Displays the two mobile phones in a dialog box.JOptionPane.showMessageDialog(null, Mobile phones:nn+mobile1.getName()+n+mobile2.getName(); 实验题8有四个类，主类Store在包.nwsuaf.jp.p4中，Mobile、Mp3Player、Product在包.nwsuaf.jp.p4.data中，Mobile、Mp3Player是Product的子类，Product和Store代码如下：Store.java源代码：package .nwsuaf.jp.p4;import java.util.Arrays;import javax.swing.JOptionPane;import .nwsuaf.jp.p4.data.Mobile;import .nwsuaf.jp.p4.data.Mp3Player;import .nwsuaf.jp.p4.data.Product;public class Store /* Defines the entry point of the application. */public static void main(String args) / Creates two mobile phone objects.Mobile mobile1 = new Mobile(China Mobile, E365,1780);Mobile mobile2 = new Mobile(China Mobile, M330,1450);Mp3Player player1 = new Mp3Player(Meizo X3, 256, 399);Mp3Player player2 = new Mp3Player(Meizo E5, 512, 580);Mp3Player player3 = new Mp3Player(Xlive XM MP3 Play,256, 930);Product products=mobile1,mobile2,player1,player2, player3;Arrays.sort(products);String text = ;for(int index = 0; index products.length; +index)text += productsindex.toString()+n;/ Displays the two mobile phones in a dialog box.JOptionPane.showMessageDialog(null,The productsare:nn+text+nThere are +Product.getCount()+ products.);Product.java源代码：package .nwsuaf.jp.p4.data;public abstract class Product implements Comparable /* Holds the name of the product. */protected String name;/* Holds the price of the product. */protected float price;/* Holds the number of products. */protected static int count;/* Create a new product object. */protected Product(String name, float price) = name;this.price = price;+count;/* Gets the name of the product. */public String getName() return name;/* Gets the price of the product. */public float getPrice() return price;/* Gets the number of products. */public static int getCount() return count;/* Compares this product with the given product. */public int compareTo(Product product) return new Float(product.getPrice().compareTo(price); 基本要求 设计类Mobile和类MP3Player，使它们和类Product、Store组成一个完整的程序，且运行结果如图所示。程序：package cn.eau.nwsuaf.jp.p4.data;public class Mobile extends ProductString size;public String getSize() return size;public void setSize(String size) this.size = size;Public Mobile(String name,String size,float price)super(name,price);this.size=size;public String toString()return size+on+name+,+price+ RMB;package cn.eau.nwsuaf.jp.p4.data;public class Mp3Player extends Productint RAM;public int getRAM() return RAM;public void setRAM(int rAM) RAM = rAM;public Mp3Player(String name,int RAM,float price)super(name,price);this.RAM=RAM;public String toString()return name+(+RAM+MB),+price+RMB;实验题9实现一个名为Person的类和它的子类Employee， Manager是Employee的子类，设计一个接口Add用于涨工资，接口中有一个抽象方法addVage（）。普通员工一次能涨10，经理能涨20。具体要求如下：（1）Person类中的属性有：姓名name（String类型），地址address（String类型）并写出该类的构造方法；（2）Employee类中的属性有：工号ID（String型），工资wage（double类型），工龄（int型），写出该类的构造方法；（3）Manager类中的属性有：级别level（String类型），写出该类的构造方法；编写一个测试类，产生一个员工和一个经理并输出其具有的信息, 之后给这两个人增加工资，然后再次输出信息。程序：package test;public interface Add double addVage();package test;public class Person String name;String address;public String getName() return name;public void setName(String name) = name;public String getAddress() return address;public void setAddress(String address) this.address = address;person (String name,String address)=name;this.address=address;package test;public class Employee extends Person implements Add String ID;double vage;int workAge;public String getID() return ID;public void setID(String ID) this.ID = ID;public double getVage() return vage;public void setVage(double vage) this.vage = vage;public int getWorkAge() return workAge;publ