Java Program to Print Diamond Number Pattern

Write a Java program to print Diamond number pattern using for loop.

import java.util.Scanner;

public class DiamondNumber1 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k;
		
		System.out.print("Enter Diamond Number Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Diamond Number Pattern");
		
		for (i = 1 ; i <= rows; i++ ) 
		{
			for (j = 1 ; j <= rows - i; j++ ) 
			{
				System.out.print(" ");	
			}
			for (k = 1 ; k <= i * 2 - 1; k++ ) 
			{
				System.out.print(k);
			}
			System.out.println();
		}
		
		for (i = rows - 1 ; i > 0; i-- ) 
		{
			for (j = 1 ; j <= rows - i; j++ ) 
			{
				System.out.print(" ");
			}
			for (k = 1 ; k <= i * 2 - 1; k++ ) 
			{
				System.out.print(k);
			}
			System.out.println();
		}
	}
}

It is another way of writing a Java program to print the diamond pattern of numbers.

import java.util.Scanner;

public class DiamondNumber2 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k, l;
		
		System.out.print("Enter Rows = ");
		int rows = sc.nextInt();
				
		for (i = 1 ; i <= rows; i++ ) 
		{
			for (j = 1 ; j <= rows - i; j++ ) 
			{
				System.out.print(" ");	
			}
			for (k = i ; k >= 1; k-- ) 
			{
				System.out.print(k);
			}
			for (l = 2 ; l <= i; l++) 
			{
				System.out.print(l);
			}
			System.out.println();
		}
		
		for (i = rows - 1 ; i > 0; i-- ) 
		{
			for (j = 1 ; j <= rows - i; j++ ) 
			{
				System.out.print(" ");
			}
			for (k = i ; k >= 1; k-- ) 
			{
				System.out.print(k);
			}
			for (l = 2 ; l <= i; l++) 
			{
				System.out.print(l);
			}
			System.out.println();
		}
	}
}

Enter Rows = 8

       1
      212
     32123
    4321234
   543212345
  65432123456
 7654321234567
876543212345678
 7654321234567
  65432123456
   543212345
    4321234
     32123
      212
       1

Java diamond numbers program using while loop.

import java.util.Scanner;

public class DiamondNumber3 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Rows = ");
		int rows = sc.nextInt();
		

		int i = 1, j, k, l;
		
		while (i <= rows ) 
		{
			j = 1 ;
			while ( j <= rows - i ) 
			{
				System.out.print(" ");
				j++;
			}
			
			k = i ;
			while (k >= 1 ) 
			{
				System.out.print(k);
				k--;
			}
			
			l = 2 ; 
			while (l <= i) 
			{
				System.out.print(l);
				l++;
			}
			System.out.println();
			i++;
		}
		
		i = rows - 1 ;
		while ( i > 0 ) 
		{
			j = 1 ;
			while (j <= rows - i ) 
			{
				System.out.print(" ");
				j++;
			}
			
			k = i ;
			while ( k >= 1 ) 
			{
				System.out.print(k);
				k--;
			}
			
			l = 2 ; 
			while (l <= i) 
			{
				System.out.print(l);
				l++;
			}
			System.out.println();
			i--;
		}
	}
}

Enter Rows = 9

        1
       212
      32123
     4321234
    543212345
   65432123456
  7654321234567
 876543212345678
98765432123456789
 876543212345678
  7654321234567
   65432123456
    543212345
     4321234
      32123
       212
        1