Java Code for Pyramid of Numbers and Reverse

Here Is Your Pyramid
                  9
                8 9 8
              7 8 9 8 7
            6 7 8 9 8 7 6
          5 6 7 8 9 8 7 6 5
        4 5 6 7 8 9 8 7 6 5 4
      3 4 5 6 7 8 9 8 7 6 5 4 3
    2 3 4 5 6 7 8 9 8 7 6 5 4 3 2
  1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1

In this problem, at the end of each row we print ‘j’ where ‘j’ value will be from i to noOfRows and from noOfRows-1 to i.

import java.util.Scanner;
public class MainClass {
 public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  //Taking noOfRows value from the user
  System.out.println("How Many Rows You Want In Your Pyramid?");
  int noOfRows = sc.nextInt();
  //Initializing rowCount with 1
  int rowCount = 1;
  System.out.println("Here Is Your Pyramid");
  //Implementing the logic
  for (int i = noOfRows; i >= 1; i--) {
   //Printing i*2 spaces at the beginning of each row
   for (int j = 1; j <= i*2; j++) {
    System.out.print(" ");
   }
   //Printing j where j value will be from i to noOfRows
   for (int j = i; j <= noOfRows; j++) {
    System.out.print(j+" ");
   }
   //Printing j where j value will be from noOfRows-1 to i
   for (int j = noOfRows-1; j >= i; j--) {
    System.out.print(j+" ");
   }
   System.out.println();
   //Incrementing the rowCount
   rowCount++;
  }
 }
}

Java program to print reverse pyramid of numbers

Here Is Your Pyramid
1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1
  1 2 3 4 5 6 7 8 7 6 5 4 3 2 1
    1 2 3 4 5 6 7 6 5 4 3 2 1
      1 2 3 4 5 6 5 4 3 2 1
        1 2 3 4 5 4 3 2 1
          1 2 3 4 3 2 1
            1 2 3 2 1
              1 2 1
                1

In this problem, we iterate outer loop in the reverse order i.e from 1 to noOfRows and initialize the rowCount to noOfRows.

import java.util.Scanner;
public class MainClass {
 public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  //Taking noOfRows value from the user
  System.out.println("How Many Rows You Want In Your Pyramid?");
  int noOfRows = sc.nextInt();
  //Initializing rowCount with noOfRows
  int rowCount = noOfRows;
  System.out.println("Here Is Your Pyramid");
  //Implementing the logic
  for (int i = 0; i < noOfRows; i++) {
   //Printing i*2 spaces at the beginning of each row
   for (int j = 1; j <= i*2; j++) {
    System.out.print(" ");
   }
   //Printing j where j value will be from 1 to rowCount
   for (int j = 1; j <= rowCount; j++) {
    System.out.print(j+" ");
   }
   //Printing j where j value will be from rowCount-1 to 1
   for (int j = rowCount-1; j >= 1; j--) {
    System.out.print(j+" ");
   }
   System.out.println();
   //Decrementing the rowCount
   rowCount--;
  }
 }
}