Ruler.java in pgm

Ruler.java

public class Ruler 

{ 

    public static void main(String[] args)

 { 

        String ruler1 = " 1 ";

        String ruler2 = ruler1 + "2" + ruler1;

        String ruler3 = ruler2 + "3" + ruler2;

        String ruler4 = ruler3 + "4" + ruler3;

        String ruler5 = ruler4 + "5" + ruler4;

        System.out.println(ruler1);

        System.out.println(ruler2);

        System.out.println(ruler3);

        System.out.println(ruler4);

        System.out.println(ruler5);

    }

}