西农java实验二.doc

实验2 面向对象编程实验目的掌握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。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; / getRadius方法的返回值 void setCircle(double r, double p) /定义setCircle方法及其变量 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(); 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. 创建构造函数为三个成员变量赋初值。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package zuoye;public class Car String name; int speed; int ChangSpeed; String changeName; String changeName (String s) return name; void stop(int s) System.out. println (停车后，车速为:0);void ChangSpeed(int s)System.out. println (当前车速为：+s);public static void main(String args) Car my =new Car(); my.changeName=yuwei; my.ChangSpeed(20);System.out. println ( 车主为：+my.changeName );my.stop(0);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。package zuoye;public class MyProgram private int data; private String str; public void setData(int data) |定义setData this.data=data; public int getData() |定义getData return data; public void setStr(String str) |定义setStr this.str=str; |定义getStr public String getstr() return str; public String toStr() String s=data + +str; return s; public static void main(String arg) MyProgram p=new MyProgram(); |创建对象 p.setData(9999); |方法调用 p.setStr(abcd); |方法调用System.out.println(变换后的字符+p.toStr(); 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。package zuoye;public class bankaccount int leftmoney; String bankaccount; public void setbankaccount(String bankaccount) this.bankaccount=bankaccount; public String getbankaccount() return bankaccount; public void setleftmoney(int leftmoney) this.leftmoney=leftmoney; 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(h 0) this.length =h; public double getLength () return length; package zuoye;public class cuboid double BottomWidth,BottomLength,height; public void setBottomWidth(double BottomWidth ) if(BottomWidth 0) this.BottomWidth=BottomWidth; public double getBottomWidth() return BottomWidth; public void setBottomLength (double BottomLength) if(BottomLength 0) this.BottomLength =BottomLength; public double getBottomLength () return BottomLength; public void setheight(double height ) if(height 0) this.height=height; public double getheight() return BottomLength; public double getVolme() return BottomLength*BottomWidth*height; public static void main(String args) Rectangle rect=new Rectangle(); rect.setLength(3); rect.setWidth(4); cuboid a=new cuboid(); a.setBottomLength(3); a.setBottomWidth(4); a.setheight(5); System.out.println(柱形的底面长方形的长为+rect.length+柱形的底面长方形的宽为：+rect.width+柱形的高为+a.height); System.out.println(它的体积是+a.getVolme(); 实验题5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。package zuoye;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(Square.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: 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; for(int i = 0; i s.length; i+)si = randShape(); for(int i = 0; i s.length; i+)si.draw(); 实验题6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。package .nwsuaf.jp.p3.data;public class Mobile /* Holds the name of the mobile. */private String name;/* Holds the price of the mobile. */private float price; private int number;/* Creates a new mobile object. */public Mobile(String name, float price,int number) = name;this.price = price; this.number=number;/* Gets the name of the mobile. */public String getName() return name;/* Gets the price of the mobile. */public float getPrice() return price;public int getnumber()return number;package .nwsuaf.jp.p3;import javax.swing.JOptionPane;import .nwsuaf.jp.p3.data.Mobile;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, 1780,1);Mobile mobile2 = new Mobile(M330, 1450,1);int s=mobile1.getnumber()+mobile2.getnumber();/ Displays the two mobile phones in a dialog box. JOptionPane.showMessageDialog(null, Mobile phones:nn+mobile1.getName()+: +mobile1.getPrice()+RMB+n +mobile2.getName()+: +mobile2.getPrice()+RMB+n+There are +s+mobile phones);实验题7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：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。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 products are:n +mobile1.getName()+ mobile2.getName()+ player3.getName() + n + player2.getName() + n+player1.getName() + nThere are + Product.getCount() + products.); package .nwsuaf.jp.p4.data;public class Mobile extends Product private String MakePlace; public Mobile(String makePlace,String name, float Price ) super(name, Price); this.MakePlace = makePlace; public String getMakePlace() return MakePlace; public void setMakePlace(String makePlace) MakePlace = makePlace; Override public String getName() / TODO Auto-generated method stub return name + on + MakePlace + Mobile, + price + RMBn; package .nwsuaf.jp.p4.data;public class Mp3Player extends Product private long MemorySize; public Mp3Player(String name, long memorySize,float Price) super(name, Price); this.MemorySize = memorySize; public long getMemorySize() return MemorySize; public void setMemorySize(long memorySize) MemorySize = memorySize; public String getName() return name + ( + MemorySize + MB + ), + price + RMB; package .nwsuaf.jp.p4.data;public abstract class Product implements Comparable protected String name;protected float price; protected static int count; protected Product(String name, float price) = name;this.price = price;+count;public String getName() return name;public float getPrice() return price;public static int getCount() return count;public int compareTo(Product product) return new Float(product.getPrice().compareTo(price);实验题8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。package zuoyou;public class Employee extends Personprotected String ID;protected double wage;protected int workAge;public Employee(String name, String address,String ID,double wage,int workAge) super(name, address);this.ID=ID;this.wage=wage;this.workAge=workAge;public String getID() return ID;public double getWage() return wage;public int getWorkAge() return workAge;public void printInfo()System.out.println(name:+this.getName()+ address:+this.getAddress()+ id:+this.getID()+ wage:+this.getWage()+ workAge:+this.getWorkAge();System.out.println(name:+this.getName()+ address:+this.getAddress()+ id:+this.getID()+ wage:+new Add().addWage(null, this.getWage()+ workAge:+this.getWorkAge();package zuoyou;public class Manager extends Employee protected String level;public Manager(String name, String address, String ID, double wage,int workAge,String level) super(name, address, ID, wage, workAge);this.level=level;public