can we use scanner class,class , object and methods to get output without using constructor ????

im getting error here..i hav used scanner class for the input at the run time ..and created the object to call the methods...why am i getting error here... can we get output using scanner class , object and methods without using constructor???

//Program to illustrate the classes and objects import java.lang.*; import java.util.*; class Rectangle1 { int length,width; double area,perimeter;

public  void  calArea()
{
    area=length*width;
}
public  void calPerimeter()
{
    perimeter=2*(length+width);
}

public  void    display()
{
    System.out.println("Length:"+length);
    System.out.println("Width:"+width);
    System.out.println("Area:"+area);
    System.out.println("Perimeter:"+perimeter);
}


public  static  void  main(String  args[])
{

                             Rectangle1  r1=new  Rectangle1();
                             Scanner s=new Scanner(System.in);

                             System.out.println("enter the length and width");
                             int l= s.nextInt();
                             int w=s.nextInt();


    r1.calArea();
    r1.calPerimeter();
    r1.display();

}

}

December 30, 2012 at 3:47 PM

ANSWER Please