通过abstract抽象类来计算周长和面积的源代码 如下 已成功运行 有不同想法可以交流
已成功运行 有不同想法可以交流
3 回答
1.
package com.imooc;
public abstract class Shape {
public abstract void ares();
public abstract void girth();
}
2.
package com.imooc;
public class Rec extends Shape {
private int l;
private int w;
public Rec(int l,int w) {
this.l=l;
this.w=w;
}
@Override
public void ares() {
System.out.println("长方形面积为: "+l*w);
}
@Override
public void girth() {
System.out.println("长方形周长为: "+(l+w)*2);
}
}
3.
package com.imooc;
public class Squ extends Shape {
private int r;
public Squ() {
}
public Squ(int r) {
this.r=r;
}
@Override
public void ares() {
System.out.println("圆面积: "+Math.PI*r*r);
}
@Override
public void girth() {
System.out.println("圆周长: "+Math.PI*2*r);
}
}
4.
package com.imooc;
public class Initial {
public static void main(String[] args) {
Shape R=new Rec(15,8);
Shape S=new Squ(7);
R.ares();
R.girth();
S.ares();
S.girth();
}
}
1.
package jszcmj;
public abstract class shape {
public double pi=3.14;
public abstract void Reactangle(double a,double b);
public abstract void Circle(double a);
}
2.
package jszcmj;
public class ReacLong extends shape {
@Override
public void Reactangle(double a, double b) {
// TODO Auto-generated method stub
double rt=(a+b)*2;
System.out.println("矩形周长为："+rt);
}
@Override
public void Circle(double a) {
// TODO Auto-generated method stub
double cc=pi*a*2;
System.out.println("圆形周长为："+cc);
}
}
3.
package jszcmj;
public class Cirmian extends shape {
@Override
public void Reactangle(double a, double b) {
// TODO Auto-generated method stub
double rtm=a*b;
System.out.println("矩形面积为："+rtm);
}
@Override
public void Circle(double a) {
// TODO Auto-generated method stub
double ccm=pi*a*a;
System.out.println("圆形面积为；"+ccm);
}
}
4.
package jszcmj;
public class Initail {
public static void main(String[] args) {
// TODO Auto-generated method stub
shape sh1=new ReacLong();
shape sh2=new Cirmian();
sh1.Reactangle(10, 20);
sh2.Reactangle(10, 20);
sh1.Circle(4);
sh2.Circle(4);
}
}举报
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