设计一个点类,他仅包含两个属性:横坐标和纵坐标.通过继承点类再设计一个圆类,他除了有一个圆心还有半径,还应该能计算周长和面积等,编写一个程序来测试所设计的类能否实现预定功能.
class Point{
private double h;//横坐标
private double z;//纵坐标
public Point(double h,double z){
this.h=h;
this.z=z;
}
public Point{
}
public double geth(){
return this.h;
}
public doubel seth(double h){
this.h=h;
}
public double getz(){
return this.z;
}
public double setz(double z){
this.z=z;
} }
class Circle extends Point{
private double hc;//圆心的横坐标
private double zc;//圆心的纵坐标
private double radius;
private double perimeter;
private double area;
private double pi=3.14;
private double D;
public Circle(double hc,double zc){
this.hc=hc;
this.zc=zc;
}
public double sethc(double hc){
this.hc=hc;
}
public double gethc(){
return this.hc;
}
public double setzc(double zc){
this.zc=zc;
}
public double gethc(){
return this.zc;
}
D=((geth()-gethc())*(geth()-gethc()))+((getz()-getzc())*(getz()-getzc()));
public static void main(String[] args){
Point p=new Point(3,4);
Circle c=new Circle(0,0);
System.out.println("圆的面积为:"+(pi*D)); }
}
请帮忙修改
class Point{
private double h;//横坐标
private double z;//纵坐标
public Point(double h,double z){
this.h=h;
this.z=z;
}
public Point{
}
public double geth(){
return this.h;
}
public doubel seth(double h){
this.h=h;
}
public double getz(){
return this.z;
}
public double setz(double z){
this.z=z;
} }
class Circle extends Point{
private double hc;//圆心的横坐标
private double zc;//圆心的纵坐标
private double radius;
private double perimeter;
private double area;
private double pi=3.14;
private double D;
public Circle(double hc,double zc){
this.hc=hc;
this.zc=zc;
}
public double sethc(double hc){
this.hc=hc;
}
public double gethc(){
return this.hc;
}
public double setzc(double zc){
this.zc=zc;
}
public double gethc(){
return this.zc;
}
D=((geth()-gethc())*(geth()-gethc()))+((getz()-getzc())*(getz()-getzc()));
public static void main(String[] args){
Point p=new Point(3,4);
Circle c=new Circle(0,0);
System.out.println("圆的面积为:"+(pi*D)); }
}
请帮忙修改
/**
* project_name: Test
* package_name: CSDN_Test_20071126
* package_declaration: package CSDN_Test_20071126;
* filename: Circle.java
* author: yuhaiming
* date: 2007-11-29
*/
package CSDN_Test_20071126;class Point{
private double h;//横坐标
private double z;//纵坐标
public Point(double h,double z){
this.h=h;
this.z=z;
}
public Point(){
}
public double getH(){
return this.h;
}
public void setH(double h){
this.h=h;
}
public double getZ(){
return this.z;
}
public void setZ(double z){
this.z=z;
} }
public class Circle extends Point{
private double hc;//圆心的横坐标
private double zc;//圆心的纵坐标
private double radius;
private double perimeter;
private double area;
private double pi=3.14;
private double D;
public Circle(double hc,double zc){
this.hc=hc;
this.zc=zc;
}
public void setHc(double hc){
this.hc=hc;
}
public double getHc(){
return this.hc;
}
public void setZc(double zc){
this.zc=zc;
}
public double getZc(){
return this.zc;
}
public static void main(String[] args){
Point p=new Point(3,4);
Circle c=new Circle(0,0);
c.D=((p.getH()-c.getHc())*(p.getH()-c.getHc()))+((p.getZ()-c.getZc())*(p.getZ()-c.getZc()));
System.out.println("圆的面积为:"+(c.pi*c.D)); }
}
private double h;//
private double z;
public Point(){
}
public Point(double h,double z){
this.h=h;
this.z=z;
}
public Point (Point p){
this.h=p.h;
this.z=p.z;
}
public double getH() {
return h;
}
public void setH(double h) {
this.h = h;
}
public double getZ() {
return z;
}
public void setZ(double z) {
this.z = z;
}
}class Circle extends Point{
private Point yuanxin;
private double radius;
private double perimeter;
private double area;
public Circle(){
}
public Circle(Point yuanxin,double radius){
super(yuanxin);
this.radius=radius;
}
public double getPerimeter(){
return 2*Math.PI*radius;
}
public double getArea(){
return Math.PI*radius*radius;
}
}public class Test{
public static void main(String[] args) {
Point p=new Point(30,5);
Circle circle=new Circle(p,8);
System.out.println(circle.getArea());
System.out.println(circle.getPerimeter());
}
}
应该可以