java程序设计教程(第六版)课后习题答案

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; // value to convert

celsiusTemp = (fahrenheitTemp - BASE)*CONVERSION_FACTOR; System.out.println ("Fahrenheit Equivalent: " + fahrenheitTemp);

System.out.println ("Celsius Temperature: " + celsiusTemp);

}

}

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();

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