java程序设计教程第六版课后习题答案.docx

1、java程序设计教程第六版课后习题答案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); 2.4

2、public 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: + fahre

3、nheitTemp); 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); 2.6pub

4、lic 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) in

5、t 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 Do

6、llar1,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)D

7、ollar2%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+ quarter

8、s 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

9、 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 JApplet public void p

10、aint (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

11、 (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 Applet public void paint (Graphics page) page.setColor(Color.BLACK); page.setFont(new Font(楷体,Font.ITALIC+Font.BOLD,30); page.drawStri

12、ng (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 Applet public void paint (Graphics page) page.drawOval(35, 35, 130, 130); page.setColor(Color.red); page.fillArc(

13、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.setColo

14、r(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)

15、/ 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()

16、 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

17、：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(

18、)/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) Sca

19、nner 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：);

20、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.

21、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 Kennel final int mul=7; int age; int agep; char name; Kennel(int age)

22、this.age=age; this.name=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 Dog1 String name; int age; public Dog1() name=heizi; age=1; public Dog1(String n, int a

23、) 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+d.name+已经有+d.age+岁了。); public class Kennel public static void main(String args) Dog1 dog

24、1=new Dog1(); System.out.println(dog1的 name=+dog1.name); System.out.println(dog1的 age=+dog1.age); Dog1 dog2=new Dog1(xiaobai,2); System.out.println(dog2的 name=+dog2.name); System.out.println(dog2的age=+dog2.age); dog1.setName(diandian); dog1.getName(); System.out.println(dog1的 name=+dog1.name); int a

25、ge=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.pr

26、intln(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=; this.info=info; public String BOOK() info=bookname+author+publish+date; return info

27、; 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,Str

28、ing 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(