4-3最后留的问题的代码有人可以写一份给我吗
抽象类那个
5 回答
abstract class Shape{
abstract int getArea(int r,int o);
abstract int getPm(int r,int o);
}
public class Circle extends Shape{
public int r,o;
public int area,pm;
public int getArea(int r,int o){
return 3*r*r;
}
public int getPm(int r,int o){
return 6*r;
}
}
public class Rectangle extends Shape{
public int length;
public int width;
public int area;
public int pm;
public int getArea(int length,int width){
return length*width;
}
public int getPm(int length,int width){
return 2*(length+width);
}
}
class Initial
{
public static void main (String args[])
{
Circle c = new Circle();
c.r = 2;c.o=5;
c.area = c.getArea(c.r,c.o);
c.pm = c.getPm(c.r,c.o);
System.out.println("area = "+c.area+"pm = "+c.pm );
Rectangle rt = new Rectangle();
rt.width = 1;
rt.length = 1;
rt.area = rt.getArea(rt.width,rt.length);
rt.pm = rt.getPm(rt.width,rt.length);
System.out.println("Area = "+rt.area+"pm = "+rt.pm);
}
}
package com.proA2;
public abstract class Shape {//抽象类shape
public abstract void perimeter(double a,double b);//求每个子类的周长
public abstract void area(double a,double b);//求每个子类的面积
}
package com.proA2;
public class Rectangle extends Shape {//子类：矩形Rectangle
@Override
public void perimeter(double a,double b) {//求周长
// TODO Auto-generated method stub
double Long = (a+b)*2;//得矩形周长
System.out.println("矩形的周长为"+Long);
}
@Override
public void area(double a,double b) {//求面积
// TODO Auto-generated method stub
double Area = a*b;//得矩形面积
System.out.println("矩形的面积为"+Area);
}
}
package com.proA2;
public class Circle extends Shape {//子类：圆形Circle
@Override
public void perimeter(double a,double b) {//求周长
// TODO Auto-generated method stub
double Long = a*3.14;//得圆形周长
System.out.println("圆形的周长为"+Long);
}
@Override
public void area(double a,double b) {//求面积
// TODO Auto-generated method stub
double Area = 3.14*((a/2)*(a/2));
System.out.println("圆形的面积为"+Area);
}
}
package com.proA2;
public class Initail {
public static void main(String[] args) {
Shape object1 = new Rectangle();//父类Shape引用指向Rectangle。
Shape object2 = new Circle();//父类Shape引用指向Circle。
object1.perimeter(5, 6);//Rectangle类的长和宽。
object1.area(5, 6);
object2.perimeter(9,0);//Circle类的直径
object2.area(9, 0);
}
}
package test;
public abstract class shape {
public abstract double getArea(double a,double b);
public abstract double getPm(double a,double b);
}
package test;
public class Circle extends shape {
public double area=0;
public double pm=0;
public double r=0;
@Override
public double getArea(double r, double b) {
// TODO Auto-generated method stub
area=r*r*3.14;
System.out.println("圆的半径为："+r+"\n面积为："+area);
return area;
}
@Override
public double getPm(double r, double b) {
// TODO Auto-generated method stub
pm=2*r*3.14;
System.out.println("圆的半径为："+r+"\n周长为："+pm);
return pm;
}
}
package test;
public class Rectangle extends shape {
public double area=0;
public double pm=0;
public double length=0;
public double width=0;
@Override
public double getArea(double length, double width) {
// TODO Auto-generated method stub
area=length*width;
System.out.println("长方形的长为："+length+"\t宽为:"+width+"\n面积为："+area);
return area;
}
@Override
public double getPm(double length, double width) {
// TODO Auto-generated method stub
pm=(width+length)*2;
System.out.println("长方形的长为："+length+"\t宽为:"+width+"\n周长为："+pm);
return pm;
}
}
package test;
public class Initial {
public static void main(String[] args) {
// TODO Auto-generated method stub
shape circle=new Circle();
shape rectangle=new Rectangle();
double r=5.6;
double width=3.2;
double length=2.5;
circle.getArea(r, 0);
circle.getPm(r, 0);
rectangle.getArea(width, length);
rectangle.getPm(width, length);
}
}
package imooc;
public abstract class Shape {
public abstract void lo(double a,double b);
public abstract void so(double a,double b);
}
public class Rectangle extends Shape {
@Override
public void lo(double a, double b) {
// TODO Auto-generated method stub
System.out.println("长方形的周长："+(a+b)*2);
}
@Override
public void so(double a, double b) {
// TODO Auto-generated method stub
System.out.println("长方形的面积："+a*b);
}
}
public class Cercle extends Shape {
final double PI=3.14;
@Override
public void lo(double a, double b) {
// TODO Auto-generated method stub
System.out.println("圆形的周长是："+a*2*PI);
}
@Override
public void so(double a, double b) {
// TODO Auto-generated method stub
System.out.println("圆形的面积是："+a*a*PI);
}
}
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Shape l=new Rectangle();
l.lo(4,5);
l.so(4,5);
Shape s=new Cercle();
s.lo(5,5);
s.so(5,5);
}
}
长方形的周长：18.0
长方形的面积：20.0
圆形的周长是：31.400000000000002
圆形的面积是：78.5
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