3回答

• 

  sunshine彩虹雨

  2016-09-26 20:06:39

  已采纳

  import java.util.Scanner;

  public class Rectangle extends Shape{

  public Rectangle(){//无参构造函数

  a = 0;

  b = 0;

  }

  public Rectangle(int a,int b){//有参构造函数

  this.a = a;

  this.b = b;

  }

  public void area(){

  int area = a*b;

  System.out.println("矩形面积area:"+area);

  }

  public void cm(){

  int cm = (a+b)*2;

  System.out.println("矩形周长cm:"+cm);

  }

  public static void main(String[] args) {

  System.out.println("请输入长：");

  Scanner input = new Scanner(System.in);

  int temp1 = input.nextInt();

  System.out.println("请输入宽：");

  int temp2 = input.nextInt();

  Rectangle R1 = new Rectangle(temp1,temp2);

  R1.area();

  R1.cm();

  }

  }

  
  

  3 0

  sunshi... 回复慕码人238...

  直接定义变量需要用到setter函数赋给对象，不如用构造函数来的方便

  2016-10-06 17:12:10

  共 3 条回复 >

• 

  慕村4056671

  2016-09-26 19:48:31

  sanner放在方法中试试，而不是直接放在类下面

  0 0
• 

  qq_微笑勉强的有点心疼_0

  2016-09-26 19:33:07

  你把Scanner 放到main方法中

  0 0