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java程序设计教程 第六版 课后习题答案.doc
pp2.3
public 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
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;
celsiusTemp = (fahrenheitTemp - BASE)*CONVERSION_FACTOR;
System.out.println ("Fahrenheit Equivalent: " + fahrenheitTemp);
System.out.println ("Celsius Temperature: " + celsiusTemp);
// value to convert
}
}
2.5
public 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);
}
}
2.6
public 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);
}
}
2.7
public 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");
}
}
2.9
import 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！");
}
}
2.11
import 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);
}
}
2.16
import javax.swing.JApplet;
import java.awt.*;
public class Olympiclogo extends JApplet{
{
public 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);
}
}
2.19
import 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.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);
}
}
2.20
import 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(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 1
import 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.java
import 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:
System.out.println("sphere2:
System.out.println("sphere1 和 sphere2 分别调用无参构造方
" + sphere1 + "\n");
" + sphere2 + "\n");
"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
sphere1.setDiameter(scan.nextDouble());
System.out.println("\n" + "更改过的 sphere1:
" +
法" +
值：");
sphere1);
}
}
//////////////////////////////////////////////////////////
PP 4.2
方法 1
import 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 Kennel{
final int mul=7;
int age;
int agep;
char name;
Kennel(int age){
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 2
class Dog1
{
String 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()
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