l练习题代码
求4.3后面的练习题代码？？
5 回答
package Shape;
public abstract class Shape {
public abstract void Girth();
public abstract void Area();
public static void main(String args[]){
Shape r = new Rectangle(5,4);
r.Girth();
r.Area();
Shape c = new Circle(5);
c.Girth();
c.Area();
}
}
package Shape;
public abstract class Shape {
public abstract void Girth();
public abstract void Area();
public static void main(String args[]){
Shape r = new Rectangle(5,4);
r.Girth();
r.Area();
Shape c = new Circle(5);
c.Girth();
c.Area();
}
}
package Shape;
public class Circle extends Shape {
int radius;
public Circle(int radius){
this.radius = radius;
}
public void Girth() {
double Girth = radius * 2 * 3.14;
System.out.println("圆形的周长为：" + Girth);
}
public void Area() {
double Area = radius * radius * 3.14;
System.out.println("圆形的面积为：" + Area);
}
}
class Text //测试类
{
public static void main(String[] args)
{
Shape s1 = new Rectangle1();
Shape s2 = new Circle();
s1.girth(3,4);
s1.size(5,2);
s2.girth(6.0);
s2.size(10.0);
}
}
abstract class Shape //父类
{
public abstract void girth(int a,int b);
public abstract void size(int a,int b);
public abstract void girth(double r);
public abstract void size(double r);
}
class Rectangle1 extends Shape//子类1
{
public void girth(int a,int b)
{
int gir;
gir = (a + b)*2;
System.out.println("矩形的周长为：" + gir );
}
public void size(int a,int b)
{
int si;
si = a * b;
System.out.println("矩形的面积为：" + si);
}
public void girth(double r){}
public void size(double r){}
}
class Circle extends Shape//子类2
{
double pai = 3.1415926;
double r;
public void girth(double r)
{
double gir = pai *r;
System.out.println("圆的周长为：" + gir);
}
public void size(double r)
{
double si;
si = pai * (r *r)/4;
System.out.println("圆的面积为：" + si);
}
public void girth(int a,int b){}
public void size(int a,int b){}
}
我用抽象写不出来啊，一直报错 类不是抽象的，并且未覆盖抽象方法，最后只能这样写了
public class Text //测试类
{
public static void main(String[] args)
{
Shape s1 = new Rectangle1();
Shape s2 = new Circle();
s1.zhouChang(3,4);
s1.squareMeasure(5,2);
s2.zhouChang(6.0);
s2.squareMeasure(10.0);
}
}
class Shape //父类
{
public void zhouChang(int a,int b){}
public void squareMeasure(int a,int b){}
public void zhouChang(double r){}
public void squareMeasure(double r){}
}
class Rectangle1 extends Shape //矩形
{
public void zhouChang(int a,int b)
{
int zc;
zc = (a + b)*2;
System.out.println("矩形的周长为：" + zc );
}
public void squareMeasure(int a,int b)
{
int sm;
sm = a * b;
System.out.println("矩形的面积为：" + sm);
}
}
class Circle extends Shape //圆形
{
double pai = 3.1415926;
public void zhouChang(double r)
{
double zc = pai *r;
System.out.println("圆的周长为：" + zc);
}
public void squareMeasure(double r)
{
double sm;
sm = pai * (r *r)/4;
System.out.println("圆的面积为：" + sm);
}
}
查看1条回复
package com.Shape;
public abstract class Shape {
public abstract void girth();
public abstract void area();
}
package com.Shape;
public class Rentanle extends Shape {
public void girth() {
// TODO Auto-generated method stub
System.out.println("长方形的周长=2*（长+宽）");
}
public void area() {
// TODO Auto-generated method stub
System.out.println("长方形的面积=长*宽");
}
}
package com.Shape;
public class Circle extends Shape {
public void girth() {
// TODO Auto-generated method stub
System.out.println("圆形的周长=π*直径");
}
public void area() {
// TODO Auto-generated method stub
System.out.println("圆形的面积=π*r*r");
}
}
package com.Shape;
public class Initial {
public static void main(String[] args) {
// TODO Auto-generated method stub
Shape s1 =new Rentanle();
s1.area();
s1.girth();
Shape s2=new Circle();
s2.area();
s2.girth();
}
}亲测可用，好像有个单词写错了，但是懒得改了。给你参考一下吧，交流一下。
举报
0/150
提交
取消
