Program:

1
1 2 1
1 2 3 2 1
1 2 3 4 3 2 1

• Program:

  public class NumberPattern5
  {
      public static void main(String[] args)
      {
          for(int i=1; i<=4; i++)
          {
              for(int j=1; j<=i; j++)
              {
                  System.out.print(j+" ");
              }
              for(int j=i-1; j>=1; j--)
              {
                  System.out.print(j+" ");
              }
              System.out.println();
          }
      }
  }