The seventh week homework (Friday)

Define a rectangle class Rectangle: (knowledge point: creation and use of objects)
1 Define three methods: getArea () for area, getPer () for perimeter, showAll () output length, width, area, perimeter in the console respectively long.
2 There are 2 attributes: long length, wide width
3 Create a Rectangle object, and output related information

 

 1 package dfishf;
 2 
 3 public class homework {
 4     int length;
 5     int width;
 6 
 7     public void getArea() {
 8         System.out.println(length * width);
 9     }
10 
11     public void getPer() {
12         System.out.println((length + width) * 2);
13     }
14 
15     public void showAll() {
16         System.out.println("长是" + length);
17          System.out.println ("Width is" + width);
 18          System.out.println ("Area is" );
 19          getArea ();
 20          System.out.println ("Perimeter is" );
 21          getPer ( );
 22      }
 23 }

 

 

 1 package dfishf;
 2 
 3 public class homework {
 4 
 5     public static void main(String[] args) {
 6 
 7         Rectangle r1=new Rectangle();
 8         r1.width=10;
 9         r1.length=50;
10         r1.getArea();
11         r1.getPer();
12         r1.showAll();
13     }
14 }