JAVA实习报告_2and3

信 息 工 程 学 院实验报告的内容与格式按任课教师的要求书写。 Java程序设计 实习报告学院:信息工程学院班级:姓名:学号: 成绩:1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。2.实验过程熟悉JAVA的编程环境实验题1 阅读如下程序，完成思考题。class CCircle double pi; double radius; double getRadius() /返回圆半径 return radius; void setCircle(double r, double p) /设置圆半径 pi=p; radius=r; public class Ex2_1 public static void main(String args) CCircle cir1=new CCircle(); /创建一个新圆类 cir1.setCircle(2.0,3.1416); /设置圆半径 System.out.println(radius=+cir1.getRadius(); / 输出圆半径 程序运行结果如下：实验题2 设计一个用来描述汽车的类，使用类的非静态成员变量来表示汽车的车主姓名、当前的速率和当前方向盘的转向角度，使用类的非静态成员方法来表示改变汽车的速率和停车两个操作。程序源代码如下：public class car String name;double speed;double angle;void car()=user;this.speed=0;this.angle=0;public String getname()return name;public void setuser(String name)=name;public void setSeppd(double speed)this.speed=speed;public double getspeed()return speed;public void setangle(double angle)this.speed=angle;public double getangle()return angle;public void stopcar()this.setangle(0);this.setSeppd(0);/* * param args */public static void main(String args) / TODO Auto-generated method stubcar A=new car();A.setuser(zhangyong);A.setSeppd(150);A.setangle(35);System.out.println(before stop car:);System.out.println(this cars belong to:+A.getname();System.out.println(now the speed is:+A.getspeed();System.out.println(now the car angle is+A.getangle();A.stopcar();System.out.println(stop car);System.out.println(this cars belong to:+A.getname();System.out.println(now the speed is:+A.getspeed();System.out.println(now the car angle is+A.getangle();运行结果：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。程序源代码如下：public class Myprogrem private int data; private String Str; public void SetData(int data) this.data=data; public void SetStr(String Str) this.Str=Str; public int getdata() return this.data; public String getStr() return this.Str; public String toString(int d) return String.valueOf(d); public static void main(String args) / TODO Auto-generated method stub Myprogrem M=new Myprogrem(); System.out.println(before change the values:); M.SetData(15); M.SetStr(zhangyong); System.out.println(M.data); System.out.println(M.Str); System.out.println(change the values:); M.SetData(20); M.SetStr(asdf); System.out.println(M.data); System.out.println(M.Str); 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();源代码如下：public class bankaccount String banknumber;double accountbalance;void bankaccoutn(String b)banknumber=b;accountbalance=5000;public String getaccountnumber()return this.banknumber;public double getaccountbalance()return this.accountbalance;public double getleftmoney()return accountbalance;public void savemoney(double money)accountbalance+=money;public void getmoney(double money)if(money=accountbalance)accountbalance-=money;elseSystem.out.println(只能取：+accountbalance);public bankaccount() / TODO Auto-generated constructor stub/* * param args */public static void main(String args) / TODO Auto-generated method stub bankaccount B=new bankaccount(); B.bankaccoutn(799524545253321346501); System.out.println(当前账号为：+B.getaccountnumber(); System.out.println(当前账号余额为：+B.getaccountbalance(); B.savemoney(21000); System.out.println(存入21000元后余额为：+B.getleftmoney(); B.getmoney(11500); System.out.println(11500元后余额为：+B.getleftmoney(); 运行结果如下：实验题5 定义链表类，实现单链表基本操作。提示：关键代码如下：public class Node public int data; Node next; public Node(int data) this.data = data; this.next=null; public void NodeDisplay() System.out.println (+data+); public class Link public Link () this.first=null; public boolean isEmpty() public void insertHeadNode(int data) public Node deleteHeadNode() public void findNode(int k) public void displayLink () public static void main (String args) 源代码如下：public class link private Node first;public link() / TODO Auto-generated constructor stubthis.first=null;public boolean isEmpty()if(this.first=null)return true;elsereturn false; public void insertHeadNode(int data)Node N=new Node(0);N.data=data;N.next=this.first.next;this.first.next=N; public Node deleteHeadNode() if(!isEmpty()this.first=this.first.next;return this.first.next;elseSystem.out.println(this link is enpty!);return null; public void findNode(int k)Node N=new Node(0);N=first.next;int i=0;while(N!=null)if(N.data=k)System.out.println(k+在节点中的位置为：+(i+1);break;N=N.next;+i;if(N=null)System.out.println(无此数！); public void displayLink ()if(this.first.next!=null)Node pro=new Node(0);pro=first.next;while(pro!=null)pro.NodeDisplay();pro=pro.next;elseSystem.out.println(link is empty！); public static void main (String args)link link = new link();link.first = new Node(0);System.out.println(没有插入数据:);link.displayLink();System.out.println(插入数据后:);link.insertHeadNode(1);link.insertHeadNode(2);link.insertHeadNode(3);link.insertHeadNode(4);link.insertHeadNode(5);link.displayLink();System.out.println(删除头结点:);link.deleteHeadNode();link.displayLink();System.out.println(查找数据3:);link.findNode(3);System.out.println(查找数据1:);link.findNode(1); 运行结果如下：实验三 面向对象编程（2）1实验目的（1）掌握Java中的继承机制及包（package）、接口（interface）等的设计方法。（2）掌握static、this、super等关键字的使用。2实验内容实验题1 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 Shape9; / 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(); 程序源代码如下：Shape类：public class shape void draw()void erase()public shape() / TODO Auto-generated constructor stub/* * param args */public static void main(String args) / TODO Auto-generated method stubSquare类：public class square extends shapevoid draw()System.out.println(square.draw();void erase() System.out.println(suqre.erase();public square() / TODO Auto-generated constructor stub/* * param args */public static void main(String args) / TODO Auto-generated method stubTriangle类：public class Triangle extends shapevoid draw()System.out.println(Triangle.draw(); void erase() System.out.println(Triangle.erase();public Triangle() / TODO Auto-generated constructor stub/* * param args */public static void main(String args) / TODO Auto-generated method stubCircle类：public class circle extends shapevoid draw() System.out.println(Circle.draw();void erase() System.out.println(Circle.erase();public circle() / TODO Auto-generated constructor stub/* * param args */public static void main(String args) / TODO Auto-generated method stubShapes类：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 shape9; for(int i = 0; i s.length; i+) / Fill up the array with shapessi = randShape();for(int i = 0; i s.length; i+)si.draw();程序运行结果如下：实验题2 有两个类：MobileManagement和Mobile，分别描述如图3.7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3.8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3.9 所示。 E365, 1780 RMB M330, 1450 RMB图3.4 手机及价格图图3.5 运行结果图程序源代码如下：.nwsuaf.jp.p3下的MobileManagement类：package .nwsuaf.jp.p3;import javax.swing.JOptionPane;public class MobileManagement /* Defines the entry point of the application. */public static void main(String args) Mobile mobile1 = new Mobile(E365, 1780);Mobile mobile2 = new Mobile(M330, 1450);JOptionPane.showMessageDialog(null, Mobile phones:nn+mobile1.getName()+n+mobile2.getName();.nwsuaf.jp.p3.data下的Mobile类：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;/* 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;运行结果如下：实验题3 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.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3.10所示。程序源码如下：.nwsuaf.jp.p4.data中Product类：package .nwsuaf.jp.p4.data;public abstract class Prouduct 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 Prouduct() /* 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(Prouduct product) return new Float(product.getPrice().compareTo(price);.nwsuaf.jp.p4.data中Mp3Player类：package .nwsuaf.jp.p4.data;public class MP3player extends Prouduct private String name; private float price; private int memory;public MP3player(String name,int memory,float price) / TODO Auto-generated constructor =name;this.price=price;this.memory=memory;+count;public String getMP3playername()return ;public float getMP3playerprice()return this.price;public int getmemory()return this.memory;public String toString () return +(+this.memory+ MB),+this.price+ RMB;.nwsuaf.jp.p4.data中Mobile类：package .nwsuaf.jp.p4.data;public class Mobile extends Prouductprivate String name;private float price;private String WTO;public Mobile(String WTO,String name,float price) / TODO Auto-generated constructor =name;this.price=price;this.WTO=WTO;+count;public String getName()return ;public float getprice()return this.price;public String getWTO()return this.WTO;public String toString()return + on +this.WTO+, +this.price+ RMB;.nwsuaf.jp.p4中的主类Store：package .nwsuaf.jp.p4;import .nwsuaf.jp.p4.data.*;public class Store extends Prouduct public String toString()return + +this.price+ ;/* 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);Prouduct prouducts=mobile1,mobile2,player1,player2, player3;Arrays.sort(prouducts);String text = ;for(int index = 0; index prouducts.length; +index)text += prouductsindex.toString()+n;/ Displays the two mobile phones in a dialog box.JOptionPane.showMessageDialog(null,The products are:nn+text+nThere are +Prouduct.getCount()+ products.);程序运行结果如下：实验题4 用LIST存放对象。利用面向对象的思想，创建以下类：Person类，包含Person的姓名和身份证号码。Student类，首先是一个Person，除此之外，包含学生的语文、数学、英文课的成绩。Teacher类，首先是一个Person，除此之外，包含教师的工资。 请创建 姓名 张三 身份证号 12310000的Person对象。 请创建 姓名 李四 身份证号 12320000 语文： 89 数学： 93 英文： 94的Student对象。 请创建 姓名 王五 身份证号 12330000 工资： 3000的Teacher对象。 将这些对象存放在List中，并打印出List中存放的内容。程序源代码如下：Person类：public class Person implements Comparable String name;String ID;public Person() / TODO Auto-generated constructor stubpublic void setperson(String name,String ID)=name;this.ID=ID;public String getname()return ;public String getID()return this.ID;public String toString() return 姓名：++ +身份证号：+this.ID;public int hashcode()return .hashCode()+this.ID.hashCode();public boolean equals(Object o)if(this=null)return false;else if(!(o instanceof Person)return false;elsePerson p=(Person)o;if(this.getID().compareTo(p.getID()0)return true;else if(this.getID().compareTo(p.getID()=0&this.getID().compareTo(p.getID()b)return 1;else if(a=b)return 0;elsereturn -1;Student类：public class Student extends Persondouble chinese;double math;double english;public Student(String name,String ID,double chinses,double math,double english) / TODO Auto-generated constructor =name;this.ID=ID;this.chinese=chinses;this.math=math;this.english=english;public double getchinses()return this.chinese;public double getmath()return this.math;public double getenglish()return this.english;public String toString()return 姓名：++ +身份证号：+this.ID+ 语文成绩：+this.chinese+ 英语成绩：+this.english+ 数学成绩：+this.math;Teacher类：public class Teacher extends Persondouble salar;public Teacher(String name, String ID, double salar) / TODO Auto-generated constructor stub =name; this.ID=ID; this.salar=salar;public double getsalar()return this.salar;public String toString()return 姓名：++ +省份证号：+this.ID+ +工资：+this.salar;List类：import java.util.ArrayList;public class List public List() / TODO Auto-gene