JAVA 书中第四章的例题
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还有学校没有讲到的，也多少写了点：以备后用了：摘出了其中一部分，限于篇幅就不全贴出来了，这毕竟是技术论坛，不该发这些菜鸟级的代码的
package tom.jiafei;
class Tom{
void speak(){
System.out.println("Tom类在tom.jiafei包中");
}
}
public class Example4_10{
public static void main(String args[]){
Tom cat=new Tom();
cat.speak();
System.out.println("Example4_10类也在tom.jiafei包中");
}
}
import java.util.Date;
public class Example4_11{
public static void main(String args[]){
Date date=new Date();
System.out.printf("本地机器的时间:\n%s",date);
}
}
import tom.jiafei.*;
public class Example4_12{
public static void main(String args[ ]){
SquareEquation equation=new SquareEquation(4,5,1);
equation.getRoots();
equation.setCoefficient(-3,4,5);
equation.getRoots();
}
}
public class Example4_13{
private int money;
Example4_13(){
money=2000;
}
private int getMoney(){
return money;
}
public static void main(String args[ ]){
Example4_13 exa=new Example4_13(); //对象exa在Example4_13类中
exa.money=3000;
int m=exa.getMoney();
System.out.println("money="+m);
}
}
贴图费劲，就不贴图了
class Lader{
double above,bottom,height;
Lader(){}
Lader(double a,double b,double h){
above=a;
bottom=b;
height=h;
}
public void setAbove(double a){
above=a;
}
public void setBottom(double b){
bottom=b;
}
public void setHeight(double h){
height=h;
}
double computeArea(){
return (above+bottom)*height/2.0;
}
}
public class Example4_1{
public static void main(String args[]){
double area1=0,area2=0;
Lader laderOne,laderTwo;
laderOne=new Lader();
laderTwo=new Lader(10,88,20);
laderOne.setAbove(16);
laderOne.setBottom(26);
laderOne.setHeight(100);
laderTwo.setAbove(300);
laderTwo.setBottom(500);
area1=laderOne.computeArea();
area2=laderTwo.computeArea();
System.out.println("laderOne的above,bottom和height:"+ laderOne.above+","+laderOne.bottom+","+laderOne.height);
System.out.println("laderOne的面积："+area1);
System.out.println("laderTwo的above,bottom和height:"+
laderTwo.above+","+laderTwo.bottom+","+laderTwo.height);
System.out.println("laderTwo的面积："+area2);
}
}
class Lader{
double above,height; //实例变量
static double bottom; //类变量
void setAbove(double a){
above=a;
}
void setBottom(double b){
bottom=b;
}
double getAbove(){
return above;
}
double getBottom(){
return bottom;
}
}
class Example4_2{
public static void main(String args[]){
Lader.bottom=60; //Lader的字节码被加载到内存，通过类名操作类变量
Lader laderOne,laderTwo;
System.out.println("现在所有Lader对象的bottom都是"+Lader.bottom);
laderOne=new Lader();
laderTwo=new Lader();
System.out.println("laderOne的bottom:"+laderOne.getBottom());
System.out.println("laderTwo的bottom:"+laderTwo.getBottom());
laderOne.setAbove(11);
laderTwo.setAbove(22);
laderTwo.setBottom(100);
System.out.println("现在所有Lader对象的bottom都是"+Lader.bottom);
System.out.println("laderOne的above:"+laderOne.getAbove());
System.out.println("laderTwo的above:"+laderTwo.getAbove());
}
}
class Tom{
final int MAX=100;
static final int MIN=20;
}
public class Example4_3{
public static void main(String args[ ]){
System.out.println(Tom.MIN);
Tom cat=new Tom();
int x=0;
x=Tom.MIN+cat.MAX;
System.out.println(x);
}
}
class Tom{
void f(int x,double y){
x=x+1;
y=y+1;
System.out.printf("参数x和y的值分别是:%d,%3.2f\n",x,y);
}
}
public class Example4_5{
public static void main(String args[]){
int x=10;
double y=12.58;
Tom cat=new Tom();
cat.f(x,y);
System.out.printf("main方法中x和y的值仍然分别是:%d,%3.2f\n",x,y);
}
}
public class Tom{
int leg;
Tom(int n){
this.cry(); //可以省略this，即将this.cry();写成cry();
leg=n;
this.cry();
}
void cry(){
System.out.println("我是Tom ,我现在有"+leg+"条腿");
}
public static void main(String args[]){
Tom cat=new Tom(4); //当调用构造方法Tom时，其中的this就是对象cat
}
}
还有第四章的一部分代码，第四章例题有点多嘛，这么神奇，看来学过的也要看看这本奇书了：
public class Example4_16{
public static void main(String args[ ]){
char a[]={'a','b','c','D','E','F'};
for(int i=0;i<a.length;i++){
if(Character.isLowerCase(a[i])){
a[i]=Character.toUpperCase(a[i]);
}
else if(Character.isUpperCase(a[i])){
a[i]=Character.toLowerCase(a[i]);
}
}
for(int i=0;i<a.length;i++){
System.out.printf("%6c",a[i]);
}
}
}
Rectangle.java
public class Rectangle{
private double x,y,width,height;
public void setX(double x){
this.x=x;
}
public double getX(){
return x;
}
public void setY(double y){
this.y=y;
}
public double getY(){
return y;
}
public void setWidth(double width){
if(width<=0)
this.width=0;
else
this.width=width;
}
public double getWidth(){
return width;
}
public void setHeight(double height){
if(height<=0)
height=0;
else
this.height=height;
}
public double getHeight(){
return height;
}
}
Circle.java
public class Circle{
private double x,y,radius;
public void setX(double x){
this.x=x;
}
public double getX(){
return x;
}
public void setY(double y){
this.y=y;
}
public double getY(){
return y;
}
public void setRadius(double radius){
if(radius<0)
this.radius=0;
else
this.radius=radius;
}
public double getRadius(){
return radius;
}
}
Geometry.java
public class Geometry{
private Rectangle rect;
private Circle circle;
Geometry(Rectangle rect,Circle circle){
this.rect=rect;
this.circle=circle;
}
public void setCirclePosition(double x,double y){
circle.setX(x);
circle.setY(y);
}
public void setCircleRadius(double radius){
circle.setRadius(radius);
}
public void setRectanglePosition(double x,double y){
rect.setX(x);
rect.setY(y);
}
public void setRectangleWidthAndHeight(double w,double h){
rect.setWidth(w);
rect.setHeight(h);
}
public void showState(){
double circleX=circle.getX();
double rectX=rect.getX();
if(rectX-circleX==circle.getRadius()*2)
System.out.println("图形中的矩形在圆的右侧");
if(circleX-rectX==rect.getWidth())
System.out.println("图形中的矩形在圆的左侧");
}
}
MainClass.java
public class MainClass{
public static void main(String args[]){
Rectangle rect1=new Rectangle(),
rect2=new Rectangle();
Circle circle1=new Circle(),
circle2=new Circle();
Geometry geometryOne,geometryTwo;
geometryOne=new Geometry(rect1,circle1);
geometryOne.setRectanglePosition(30,40);
geometryOne.setRectangleWidthAndHeight(120,80);
geometryOne.setCirclePosition(150,30);
geometryOne.setCircleRadius(60);
geometryTwo=new Geometry(rect2,circle2);
geometryTwo.setRectanglePosition(160,160);
geometryTwo.setRectangleWidthAndHeight(120,80);
geometryTwo.setCirclePosition(40,30);
geometryTwo.setCircleRadius(60);
geometryOne.showState();
geometryTwo.showState();
}
}
class Employee{
private double salary=1800;
public void setSalary(double salary){
if(salary>1800&&salary<=6000){
this.salary=salary;
}
}
public double getSalary(){
return salary;
}
}
public class Example4_14{
public static void main(String args[]){
Employee zhang=new Employee();
Employee wang=new Employee();
zhang.setSalary(100);
System.out.println("zhang的薪水："+zhang.getSalary());
wang.setSalary(3888);
//wang.salary=88888;是非法的，因为对象wang已经不在Employee类中
System.out.println("wang的薪水："+wang.getSalary());
}
}
package tom.jiafei;
class Tom{
void speak(){
System.out.println("Tom类在tom.jiafei包中");
}
}
public class Example4_10{
public static void main(String args[]){
Tom cat=new Tom();
cat.speak();
System.out.println("Example4_10类也在tom.jiafei包中");
}
}
import java.util.Date;
public class Example4_11{
public static void main(String args[]){
Date date=new Date();
System.out.printf("本地机器的时间:\n%s",date);
}
}
import tom.jiafei.*;
public class Example4_12{
public static void main(String args[ ]){
SquareEquation equation=new SquareEquation(4,5,1);
equation.getRoots();
equation.setCoefficient(-3,4,5);
equation.getRoots();
}
}
public class Example4_13{
private int money;
Example4_13(){
money=2000;
}
private int getMoney(){
return money;
}
public static void main(String args[ ]){
Example4_13 exa=new Example4_13(); //对象exa在Example4_13类中
exa.money=3000;
int m=exa.getMoney();
System.out.println("money="+m);
}
}
贴图费劲，就不贴图了
class Lader{
double above,bottom,height;
Lader(){}
Lader(double a,double b,double h){
above=a;
bottom=b;
height=h;
}
public void setAbove(double a){
above=a;
}
public void setBottom(double b){
bottom=b;
}
public void setHeight(double h){
height=h;
}
double computeArea(){
return (above+bottom)*height/2.0;
}
}
public class Example4_1{
public static void main(String args[]){
double area1=0,area2=0;
Lader laderOne,laderTwo;
laderOne=new Lader();
laderTwo=new Lader(10,88,20);
laderOne.setAbove(16);
laderOne.setBottom(26);
laderOne.setHeight(100);
laderTwo.setAbove(300);
laderTwo.setBottom(500);
area1=laderOne.computeArea();
area2=laderTwo.computeArea();
System.out.println("laderOne的above,bottom和height:"+ laderOne.above+","+laderOne.bottom+","+laderOne.height);
System.out.println("laderOne的面积："+area1);
System.out.println("laderTwo的above,bottom和height:"+
laderTwo.above+","+laderTwo.bottom+","+laderTwo.height);
System.out.println("laderTwo的面积："+area2);
}
}
class Lader{
double above,height; //实例变量
static double bottom; //类变量
void setAbove(double a){
above=a;
}
void setBottom(double b){
bottom=b;
}
double getAbove(){
return above;
}
double getBottom(){
return bottom;
}
}
class Example4_2{
public static void main(String args[]){
Lader.bottom=60; //Lader的字节码被加载到内存，通过类名操作类变量
Lader laderOne,laderTwo;
System.out.println("现在所有Lader对象的bottom都是"+Lader.bottom);
laderOne=new Lader();
laderTwo=new Lader();
System.out.println("laderOne的bottom:"+laderOne.getBottom());
System.out.println("laderTwo的bottom:"+laderTwo.getBottom());
laderOne.setAbove(11);
laderTwo.setAbove(22);
laderTwo.setBottom(100);
System.out.println("现在所有Lader对象的bottom都是"+Lader.bottom);
System.out.println("laderOne的above:"+laderOne.getAbove());
System.out.println("laderTwo的above:"+laderTwo.getAbove());
}
}
class Tom{
final int MAX=100;
static final int MIN=20;
}
public class Example4_3{
public static void main(String args[ ]){
System.out.println(Tom.MIN);
Tom cat=new Tom();
int x=0;
x=Tom.MIN+cat.MAX;
System.out.println(x);
}
}
class Tom{
void f(int x,double y){
x=x+1;
y=y+1;
System.out.printf("参数x和y的值分别是:%d,%3.2f\n",x,y);
}
}
public class Example4_5{
public static void main(String args[]){
int x=10;
double y=12.58;
Tom cat=new Tom();
cat.f(x,y);
System.out.printf("main方法中x和y的值仍然分别是:%d,%3.2f\n",x,y);
}
}
public class Tom{
int leg;
Tom(int n){
this.cry(); //可以省略this，即将this.cry();写成cry();
leg=n;
this.cry();
}
void cry(){
System.out.println("我是Tom ,我现在有"+leg+"条腿");
}
public static void main(String args[]){
Tom cat=new Tom(4); //当调用构造方法Tom时，其中的this就是对象cat
}
}
还有第四章的一部分代码，第四章例题有点多嘛，这么神奇，看来学过的也要看看这本奇书了：
public class Example4_16{
public static void main(String args[ ]){
char a[]={'a','b','c','D','E','F'};
for(int i=0;i<a.length;i++){
if(Character.isLowerCase(a[i])){
a[i]=Character.toUpperCase(a[i]);
}
else if(Character.isUpperCase(a[i])){
a[i]=Character.toLowerCase(a[i]);
}
}
for(int i=0;i<a.length;i++){
System.out.printf("%6c",a[i]);
}
}
}
Rectangle.java
public class Rectangle{
private double x,y,width,height;
public void setX(double x){
this.x=x;
}
public double getX(){
return x;
}
public void setY(double y){
this.y=y;
}
public double getY(){
return y;
}
public void setWidth(double width){
if(width<=0)
this.width=0;
else
this.width=width;
}
public double getWidth(){
return width;
}
public void setHeight(double height){
if(height<=0)
height=0;
else
this.height=height;
}
public double getHeight(){
return height;
}
}
Circle.java
public class Circle{
private double x,y,radius;
public void setX(double x){
this.x=x;
}
public double getX(){
return x;
}
public void setY(double y){
this.y=y;
}
public double getY(){
return y;
}
public void setRadius(double radius){
if(radius<0)
this.radius=0;
else
this.radius=radius;
}
public double getRadius(){
return radius;
}
}
Geometry.java
public class Geometry{
private Rectangle rect;
private Circle circle;
Geometry(Rectangle rect,Circle circle){
this.rect=rect;
this.circle=circle;
}
public void setCirclePosition(double x,double y){
circle.setX(x);
circle.setY(y);
}
public void setCircleRadius(double radius){
circle.setRadius(radius);
}
public void setRectanglePosition(double x,double y){
rect.setX(x);
rect.setY(y);
}
public void setRectangleWidthAndHeight(double w,double h){
rect.setWidth(w);
rect.setHeight(h);
}
public void showState(){
double circleX=circle.getX();
double rectX=rect.getX();
if(rectX-circleX==circle.getRadius()*2)
System.out.println("图形中的矩形在圆的右侧");
if(circleX-rectX==rect.getWidth())
System.out.println("图形中的矩形在圆的左侧");
}
}
MainClass.java
public class MainClass{
public static void main(String args[]){
Rectangle rect1=new Rectangle(),
rect2=new Rectangle();
Circle circle1=new Circle(),
circle2=new Circle();
Geometry geometryOne,geometryTwo;
geometryOne=new Geometry(rect1,circle1);
geometryOne.setRectanglePosition(30,40);
geometryOne.setRectangleWidthAndHeight(120,80);
geometryOne.setCirclePosition(150,30);
geometryOne.setCircleRadius(60);
geometryTwo=new Geometry(rect2,circle2);
geometryTwo.setRectanglePosition(160,160);
geometryTwo.setRectangleWidthAndHeight(120,80);
geometryTwo.setCirclePosition(40,30);
geometryTwo.setCircleRadius(60);
geometryOne.showState();
geometryTwo.showState();
}
}
class Employee{
private double salary=1800;
public void setSalary(double salary){
if(salary>1800&&salary<=6000){
this.salary=salary;
}
}
public double getSalary(){
return salary;
}
}
public class Example4_14{
public static void main(String args[]){
Employee zhang=new Employee();
Employee wang=new Employee();
zhang.setSalary(100);
System.out.println("zhang的薪水："+zhang.getSalary());
wang.setSalary(3888);
//wang.salary=88888;是非法的，因为对象wang已经不在Employee类中
System.out.println("wang的薪水："+wang.getSalary());
}
}
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