Here is the code that will display some pattern of numbers in the form pyramid.

class Pattern 
{
    public static void main(String[] args){

        for(int i=1;i<=4;i++){
            for(int j=1;j<=i;j++){
                System.out.print(j);
        }
         System.out.println();
        }
         System.out.println();
        for(int i=4;i>=1;i--){
        for(int j=1;j<i+1;j++){
            System.out.print(j);
        }
          System.out.println();
        }
    }
}