java程序设计教程(第六版)课后习题答案.doc

pp2.3public class fudian public static void main(String args) float a=2.10f,b=3.70f; float Result1,Result2,Result3; Result1=a+b; Result2=a-b; Result3=a*b; System.out.println(Result1 is:+Result1); System.out.println(Result2 is:+Result2); System.out.println(Result3 is:+Result3);2.4public class TempConverter public static void main(String args) final int BASE = 32; final double CONVERSION_FACTOR = 5.0 / 9.0; double celsiusTemp; int fahrenheitTemp = 70; / value to convert celsiusTemp = (fahrenheitTemp - BASE)*CONVERSION_FACTOR; System.out.println (Fahrenheit Equivalent: + fahrenheitTemp); System.out.println (Celsius Temperature: + celsiusTemp);2.5public class yinglizhuanqianmi public static void main(String args) float Base=1.60935f;float Qianmi;float Yingli=19.85f;Qianmi=Yingli*Base;System.out.println (Ying Li: + Yingli); System.out.println (Qian Mi: +Qianmi);2.6public class TimeConverter1 public static void main(String args) int Hour=5,Minute=35,Second=51; int SECONDS; SECONDS=Hour*60*60+Minute*60+Second; System.out.println (+Hour+时+Minute+分+Second+秒); System.out.println (换算成秒: + SECONDS);2.7public class TimeConverter2 public static void main(String args) int SECONDS=10853; int Hour,Minute,Second; Second=SECONDS%60; Minute=(SECONDS-Second)%60; Hour=(SECONDS-Second-Minute*60)/3600; System.out.println (SECONDS+秒，转化为); System.out.println (Hour+时+Minute+分+Second+秒);2.9import java.util.*;public class Dollarbill public static void main(String args) float Dollar1,Dollar2; int Ten,Five,One,Quarters,Dimes,Nickles,Pennies; Scanner reader=new Scanner(System.in); System.out.println(输入币值：); Dollar1=reader.nextFloat(); Dollar2=Dollar1*100; Pennies= (int)Dollar2%5; Nickles=(int)Dollar2%10-Pennies)/5; Dimes=(int)Dollar2-Pennies-Nickles*5)%50/10; Quarters=(int)Dollar2%100/50; One=(int)Dollar2- Pennies-Nickles*5-Dimes*10-Quarters*50)%500/100; Five=(int)Dollar2%1000/500; Ten=(int)Dollar2/1000; System.out.println(Ten+ ten dollar bills); System.out.println(Five+ five dollar bills); System.out.println(One+ one dollar bills); System.out.println(Quarters+ quarters dollar bills); System.out.println(Dimes+ dimes dollar bills); System.out.println(Nickles+ nickles dollar bills); System.out.println(Pennies+ pennies dollar bills！);2.11import java.util.*;public class Fenshuzhuanhuan public static void main(String args) int x,y; double Result=0; Scanner reader=new Scanner(System.in); System.out.println(输入x：); x=reader.nextInt(); System.out.println(输入y：); y=reader.nextInt(); Result+=x/y; System.out.println (分数 +x+/+y); System.out.println (转换成小数是: + Result);2.16import javax.swing.JApplet;import java.awt.*;public class Olympiclogo extends JAppletpublic void paint (Graphics page) page.setColor(Color.blue); page.drawOval(25, 65, 40, 40); page.setColor(Color.yellow); page.drawOval (55, 65, 40, 40); page.setColor(Color.black); page.drawOval (85, 65, 40, 40); page.setColor(Color.green); page.drawOval (115, 65, 40, 40); page.setColor(Color.red); page.drawOval (145, 65, 40, 40);/ circle page.setColor(Color.cyan); page.drawString (OLYMPIC LOGO, 40, 30); 2.19import java.applet.*;import java.awt.*;public class Ex2_19 extends Appletpublic void paint (Graphics page)page.setColor(Color.BLACK);page.setFont(new Font(楷体,Font.ITALIC+Font.BOLD,30); page.drawString (林少锋, 40, 30);page.setColor(Color.blue);page.setFont(new Font(宋体,Font.BOLD,30); page.drawString (林少锋, 70, 80);2.20import java.applet.*;import java.awt.*;public class Ex2_20 extends Appletpublic void paint (Graphics page)page.drawOval(35, 35, 130, 130);page.setColor(Color.red);page.fillArc(35, 35, 130, 130,0,45);page.setColor(Color.blue);page.fillArc(35, 35, 130, 130,45,45);page.setColor(Color.yellow);page.fillArc(35, 35, 130, 130,90,45);page.setColor(Color.cyan);page.fillArc(35, 35, 130, 130,135,45);page.setColor(Color.gray);page.fillArc(35, 35, 130, 130,180,45);page.setColor(Color.green);page.fillArc(35, 35, 130, 130,225,45);page.setColor(Color.darkGray);page.fillArc(35, 35, 130, 130,270,45);page.setColor(Color.pink);page.fillArc(35, 35, 130, 130,315,45);PP4.1方法1import java.util.*;public class CreateSphere /* * param args */public static void main(String args) / TODO 自动生成方法存根System.out.println(请输入直径d：);Scanner scan=new Scanner(System.in);double d=scan.nextDouble(); Sphere D=new Sphere(d);D.Square();D.Volum();System.out.println(D.toString();public class Sphere final double PI=3.14; double V,S; double d; Sphere(double d) this.d=d; public void Volum()V=(4/3)*PI*(d/2)*(d/2)*(d/2);public void Square()S=4*PI*(d/2)*(d/2);public String toString()String s=;String result1=Double.toString(S);String result2=Double.toString(V);s=(体积为：+result2+面积为：+result1);return s;方法2/Sphere.java public class Sphere private double diameter; public Sphere()/构造方法：无参数 this.diameter = 1.0; public Sphere(double d) /构造方法：带一个参数 this.diameter = d; public void setDiameter(double d) /设置直径值的方法 this.diameter = d; public double getDiameter()/获取直径值的方法 return this.diameter; public double volume()/计算球的体积 return 4*Math.PI*Math.pow(this.diameter/2,3)/3; public double area()/计算球的表面积 return 4*Math.PI*Math.pow(this.diameter/2,2); public String toString() String out = 该球体的直径为： + this.diameter + n + 该球体的表面积为： + this.area() + n +该球体的体积为： + this. volume(); return out; /MultiSphere.javaimport java.util.Scanner;public class MultiSphere public static void main(String args) Scanner scan = new Scanner(System.in); Sphere sphere1 = new Sphere(); Sphere sphere2 = new Sphere(3.5); System.out.println(sphere1: + sphere1 + n); System.out.println(sphere2: + sphere2 + n); System.out.println(sphere1和sphere2分别调用无参构造方法 + 和带一个参数的构造方法进行初始化。); System.out.print(现在，请输入一个数作为球sphere1的直径值：); sphere1.setDiameter(scan.nextDouble(); System.out.println(n + 更改过的sphere1: + sphere1); /PP 4.2方法1import java.util.Scanner;public class CreateDog /* * param args */public static void main(String args) / TODO 自动生成方法存根System.out.println(请输入狗的年龄age：);Scanner scan=new Scanner(System.in);int age=scan.nextInt();System.out.println(请输入狗的姓名name：);Scanner scan1=new Scanner(System.in);String name=scan1.next(); Kennel AGE=new Kennel(age);AGE.Age();System.out.println(AGE.toString();System.out.println(狗的名字是： +name);public class Kennelfinal int mul=7;int age;int agep;char name;Kennel(int age)this.age=age;=name;public void Age()agep=age*mul;public String toString()String s=;String r1=Integer.toString(age);String r2=Integer.toString(agep);s=(狗的年龄为：+r1+ 对应人的年龄为:+r2);return s;方法2class Dog1String name; int age; public Dog1() name=heizi; age=1; public Dog1(String n, int a ) name=n; age=a; public int DogAge(int Age) int age=Age/7; return(age); public void setName(String name1) name=name1; public String getName() return(name); public String toString() Dog1 d=new Dog1();return(这只狗叫++已经有+d.age+岁了。); public class Kennel public static void main(String args) Dog1 dog1=new Dog1();System.out.println(dog1的 name=+);System.out.println(dog1的 age=+dog1.age);Dog1 dog2=new Dog1(xiaobai,2);System.out.println(dog2的 name=+);System.out.println(dog2的age=+dog2.age);dog1.setName(diandian);dog1.getName();System.out.println(dog1的 name=+);int age=dog1.DogAge(35);System.out.println(age=+age);String r=dog1.toString();System.out.println(r=+r);/PP 4.4方法1public class Book /* * param args */public static void main(String args) / TODO 自动生成方法存根String info = null;Bookshelf book;Bookshelf INFO=new Bookshelf(info);INFO.BOOK();System.out.println(INFO.toString();public class Bookshelf String bookname;String author;String publish;String date;String books;String info;public Bookshelf(String info)bookname=JAVA;author=qwe;publish=Tsing HUA;date=19890322;=info;public String BOOK()info=bookname+author+publish+date;return info;public String toString()String bookinfo;bookinfo=书名：+bookname+ 作者：+author+n;bookinfo+=出版社：+publish+ +出版日期：+date;return bookinfo;方法2class Book String title,author,publisher,copyright; Book() title=JAVA 编程语言设计; author=John Lewis; publisher=电子工业出版社; copyright=xuesheng; Book(String t,String a,String p,String c) title= t; author=a; publisher=p; copyright=c; void setBook(String t1,String a1,String p1,String c1) title= t1; author=a1; publisher=p1; copyright=c1; String getBookTitle() return(title); String getBookAuthor() return(author);String getBookPublisher() return(publisher); String getBookCopyright() return(copyright); public String toString() Book bo=new Book();return (这本名叫+bo.title+ 书，作者是+bo.author+ 出版社是+bo.publisher+ 版权归+bo.copyright+所有); public class Bookshelf public static void main(String args) Book book=new Book();System.out.println(book.title+ +book.author+ +book.publisher+ +book.copyright);/ TODO Auto-generated method stub Book book1=new Book(C语言程序设计,谭浩强,清华出版社,zuozhe); System.out.println(book1.title+ +book1.author+ +book1.publisher+ +book1.copyright); book.setBook(JAVA 语言设计,William Loftus,西安电子出版社,sheng); book.getBookTitle(); book.getBookAuthor(); book.getBookPublisher(); book.getBookCopyright(); System.out.println(book.title+ +book.author+ +book.publisher+ +book.copyright); String str=book.toString(); System.out.print(str=+str);/PP4.5class FlightString name, origin,destination;int number; public Flight()name=西安国际机场;origin=西安;destination=北京;number=121; public Flight(String n,String o,String d,int num) name=n;origin=o;destination=d;number=num; public void setFlight(String n1,String o1,String d1,int num1) name=n1; origin=o1; destination=d1; number=num1; public String getName() return name; public String getOrigin() return origin; public String getDestination() return destination; public long getNumber() return number; public String toString() Flight fl=new Flight();return (这是++的+fl.number+航班，从+fl.origin+起飞到+fl.destination+降落。); public class FlightTest public static void main(String args) Flight flight=new Flight(); System.out.println(airline Flight=+); System.out.println(the flights origin=+flight.origin); System.out.println(destination citys=+flight.destination); System.out.println(flight number=+flight.number); Flight flight1=new Flight(天津航空,天津,西安,321); System.out.println(airline Flight=+); System.out.println(the flights origin=+flight1.origin); System.out.println(destination citys=+flight1.destination); System.out.println(flight number=+flight1.number); flight.setFlight(北京航空,北京,西安,125); flight.getName(); flight.getOrigin(); flight.getDestination(); flight.getNumber(); System.out.println(airline Flight=+); System.out.println(the flights origin=+flight.origin); System.out.println(destination citys=+flight.destination); System.out.println(flight number=+flight.number); String real=flight.toString(); System.out.println(real);/PP4.7class PairOfDiceprivate final int MAX=6;private int faceValue;private int faceValue1;public PairOfDice()faceValue=1;faceValue1=2;public int roll()faceValue=(int)(Math.random()*MAX)+1;return faceValue;public int roll1()faceValue1=(int)(Math.random()*MAX)+1;return faceValue1;public void setFaceValue(int value)faceValue=value;public int getFaceValue()return faceValue;public void setFaceValue1(int value)faceValue1=value;public int getFaceValue1()return faceValue1;public int Sum() int sum=faceValue+faceValue1; return sum;public String toString()String result=Integer.toString(faceValue);return result;public class RollingDice2 public static void main(String args) PairOfDice die1=new PairOfDice(); int faceValue=die1.roll();int faceValue1=die1.roll1();System.out.println(faceValue=+faceValue+ faceValue1=+faceValue1);int sum=die1.Sum();System.out.println(sum=+sum);PairOfDice die2=new PairOfDice();die2.setFaceValue(4);int faceValue2=die2.getFaceValue();System.out.println(faceValue2=+faceValue2);die2.setFaceValue1(3);int faceValue3=die2.getFaceValue1();System.out.println(faceValue3=+faceValue3); int sum2=die2.Sum();System.out.println(sum2=+sum2);App4.13源程序：/PushDisplayPanel.javaimport java.awt.*;import java.awt.event.*;importjavax.swing.*;public class PushDisplayPanel extends JPanel /* * */private static final long serialVersionUID = 8617749572451960356L;private int count;private JButton push;private JLabel label;intnum;int I=100;public PushDisplayPanel()push=new JButton(Push it!);push.addActionListener(new ButtonListener();label=newJLabel(Random:+count);add (push);add (label);setPreferredSize(new Dimension(400,100);setBackground(Color.pink);private classButtonListenerimplementsActionListenerpublicvoidactionPerformed(ActionEvent event)for(int j=0;jI;j+)num=(int)(Math.random()*100)+1;label.setText(Random:+num);/Random.javaimportjavax.swing.JFrame;public class Random public static void main(String args) JFrame frame=new JFrame(Random);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.getContentPane().add(new PushDisplayPanel();frame.pack();frame.setVisible(true);/App4.14源程序：/AddPanel.javaimport java.awt.*;import java.awt.event.*;importjavax.swing.*;public class AddPanel extends JPanel /* * */private static final long serialVersionUID = 8617749572451960356L;private int count;private JButton push,push1;private JLabel label;intnum=50;public AddPanel()push=new JButton(Add!);push1=new JButton(Minus!);push.addActionListener(new ButtonListener();push1.addActionListener(new ButtonListener();label=newJLabel(Number:+num);add (push);add (push1);add (label);setPreferredSize(new Dimension(400,100);setBackground(Color.pink);private classButtonListenerimplementsActionListenerpublicvoidactionPerformed(ActionEvent event)if(event.getSource()=push)num+;elsenum-;label.setText(Number:+num);/Number.javaimport javax.swing.JFrame;public class Number/* * param args */public static void main(String args) / TODO 自动生成方法存根