Java程序设计实用教程 书中代码(2)

break;

default: System.out.println(\彩票不是三等奖\ }

switch(d2) { case 29 : case 46 :

case 21 : System.out.println(\彩票是二等奖\ break;

default: System.out.println(\彩票不是二等奖\ }

switch(d3) { case 875 : case 326 :

case 596 : System.out.println(\彩票是一等奖\ break;

default: System.out.println(\彩票不是一等奖\ } } } }

Example3_2.java

import java.util.Scanner; public class Example3_2 {

public static void main(String args[]) { Scanner reader = new Scanner(System.in); System.out.println(\输入彩票号回车确认\ int number = reader.nextInt();

Administrator person = new Administrator(); person.giveMess(number); } }

例3-3

ComputerSum.java

public class ComputerSum {

void giveSum(int number,int length) { if(number<=9&&number>=1) {

long sum=0,a=number,item=a,n=length,i=1; for(i=1;i<=n;i++) { sum=sum+item; item=item*10+a; }

System.out.println(sum); } else {

System.out.println(\请给出正确的数字\

} } }

Example3_3.java

public class Example3_3 {

public static void main(String args[]) {

ComputerSum computer = new ComputerSum(); computer.giveSum(8,10); } }

例3-4

Example3_4.java

public class Example3_4 {

public static void main(String args[]) { double sum=0,item=1; int i=1,n=20; while(i<=n) { sum=sum+item; i=i+1;

item=item*(1.0/i); }

System.out.println(\ } }

例3-5

Example3_5.java

public class Example3_5 {

public static void main(String args[]) { for(char c='a';c<='z';c++) { switch(c) { case 'a' : case 'z' :

case 'm' : continue; }

System.out.print(c); }

System.out.println(\

long sum=0,i=1,max=1931918,N=0; while(true) { sum=sum+i; if(sum>max) { N=i-1;

break; } i++; }

System.out.println(\满足1+2+...+n<=\的最大整数n为\ } }

例4-1

Vehicle.java

public class Vehicle {

double speed; //变量声明部分,刻画速度 int power; //变量声明部分,刻画功率 void speedUp(int s) { //方法定义,刻画加速功能 speed=speed+s; }

void speedDown(int d) { //方法定义,刻画减速功能 speed=speed-d; }

void setPower(int p) { power=p; }

int getPower() { return power; }

double getSpeed() { return speed; } }

例4-2

Example4_2.java

public class Example4_2 {

public static void main(String args[]) { Vehicle car1,car2; //声明2个对象

car1 = new Vehicle(); //为对象car1分配变量，使用new 运算符和默认的构造方法 car2 = new Vehicle(); //为对象car2分配变量，使用new 运算符和默认的构造方法 car1.setPower(128); car2.setPower(76);

System.out.println(\的功率是：\ System.out.println(\的功率是：\ car1.speedUp(80); car2.speedUp(100);

System.out.println(\目前的速度：\ System.out.println(\目前的速度：\ car1.speedDown(10);

car2.speedDown(20);

System.out.println(\目前的速度：\ System.out.println(\目前的速度：\ } }

例4-3

Example4_3.java

public class Example4_3 {

public static void main(String args[]) { Vehicle carOne,carTwo,carThree; carOne = new Vehicle(); carTwo = new Vehicle(); carOne.speedUp(60); carTwo.speedUp(90);

System.out.println(\目前的速度：\ System.out.println(\目前的速度：\ carOne = carTwo; carThree = carTwo;

System.out.println(\目前的速度：\ System.out.println(\目前的速度：\ System.out.println(\目前的速度：\ carOne=null; //carOne成为一个空对象

System.out.println(\目前的速度：\发生NullPointerException异常 } }

例4-4

Circle.java

public class Circle { double radius,area; void setRadius(double r) { if(r>0){ radius=r; } }

double getRadius(){ return radius; }

double getArea(){

area=3.14*radius*radius; return area; } }

Example4_4.java

public class Example4_4 {

public static void main(String args[]) { Circle circle=new Circle(); double w=12.76; circle.setRadius(w);

System.out.println(\圆的半径：\ System.out.println(\圆的面积：\

System.out.println(\更改向方法参数r传递值的w的值为100\ w=100;

System.out.println(\

System.out.println(\圆的半径：\ } }

例4-5

TV.java

public class TV {

int channel; //电视频道 void setChannel(int m) { if(m>=1){ channel=m; } }

int getChannel(){ return channel; }

void showProgram(){ switch(channel) {

case 1 : System.out.println(\综合频道\ break;

case 2 : System.out.println(\经济频道\ break;

case 3 : System.out.println(\文艺频道\ break;

case 4 : System.out.println(\国际频道\ break;

case 5 : System.out.println(\体育频道\ break;

default : System.out.println(\不能收看\频道\ } } }

Chineses.java

public class Chineses {

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