第七周上机作业2

1 定义三个方法：getArea()求面积、getPer()求周长，showAll()分别在控制台输出长、宽、面积、周长。

package test1;

public class Rectangle {
    int length;
    int width;
    
    public void getArea(){
        System.out.println(length * width);
    }

    public void getPer(){
        System.out.println((length + width)*2);
    }
    public void showAll(){
        System.out.println("长是" + length);
        System.out.println("宽是" + width);
        System.out.println("面积是");
        getArea();
        System.out.println("周长是");
        getPer();
    }
}

package test1;
import java.util.Scanner;
public class Homework {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         Rectangle a1 = new Rectangle();
         Scanner input = new Scanner(System.in);
         System.out.print("请输入长:");
         a1.length = input.nextInt();
         System.out.print("请输入宽:");
         a1.width = input.nextInt();
         a1.showAll();
    }

}