Java program to print reverse pyramid of numbers

Pattern3

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--;
		}
	}
}

Pattern 4

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++;
		}
	}
}