矩形

 

代码

 

package 四则;
import java.util.*;

public class mianji {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Scanner b=new Scanner(System.in);
  juxing a=new juxing();
  System.out.println("输入长");
  double chang = b.nextInt();
  System.out.println("输入宽");
  double kuan = b.nextInt();//声明对象
  a.chang=chang;
  a.kuan=kuan;//调用对象
  System.out.println("面积"+a.area());
  System.out.println("周长"+a.zhouchang());
 }
}
 class juxing {
     double chang;
     double kuan;
     double zhouchang;
     double area;
     double area() {//方法
      double a = 0;
      a=(double) (chang*kuan);
   return a;
     }
     double zhouchang() {
      
      double b=0;
      b=(double) 2*(chang+kuan);
   return b;
      
     }
 }