Ninth java

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

Definition method:

package rectangle;
 public  class Rectangle {
     double length, width, area, per; 

    // Calculate area method 
    public  void getArea () { 
        area = length * width; 
    } 
    // Calculate perimeter method 
    public  void getPer () { 
        per = 2 * (length + width); 
    } 
    // Output rectangle length, width, height, area, and perimeter. 
    public  void showAll () { 
        System.out.println ( "Length:" + length + "Width is" + width + "Area" + area + "Perimeter" + per); 
    } 
}

Call method:

package rectangle;
 import java.util. * ;
 public  class gogogo {
     public  static  void main (String [] args) {
         // TODO Auto-generated method stub 
        Rectangle p = new Rectangle (); 
        Scanner input = new Scanner (System.in ); 
        System.out.println ( "Please enter the length and width of the rectangle" ); 
        System.out.print ( "The length of the rectangle is \ n" ); 
        p.length = input.nextDouble (); 
        System.out.println ( "The width of the rectangle is" ); 
        p.width = input.nextDouble();
        p.getArea();
        p.getPer();
        p.showAll();
    }

}