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[Java] Diamond Pattern Java Program

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In this “Diamond Pattern” – We have written Java programs to print/draw Star (X) pattern by using different types of Java loops and you can execute and try these Java program through your IDE. This is most [100+] Frequently Asked Java Program on beginner level to check you Java Programming skills and Concept.

Logic

In the Diamond Pattern following this logic,

  • Diamond will draw in two phases upper part and lower part (just opposite logic)
  • First and last row will have only one symbol.
  • Consider spaces from left before print symbols
  • Once last symbol print jump cursor to next row (n)
Diamond Pattern

This post covers following ways to print Diamond Pattern:

Diamond Pattern Java Program: For Loop

This Diamond Java Program is following the below for loop logic:

package _1_patterns.diamond;

import java.util.Scanner;

public class DiamondPatterForLoop {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println("Enter Pattern Size : ");
		int size = sc.nextInt();

		System.out.print("Enter Symbol : ");
		char symbol = sc.next().charAt(0);

		drawDiamondPattern(size, symbol);

		// Close Scanner
		sc.close();
	}

	private static void drawDiamondPattern(int n, char c) {

		// prints upper section of the pattern
		for (int i = 1; i <= n; i++) {
			// print spaces from left
			for (int j = n; j > i; j--) {
				System.out.print(" ");
			}
			// print symbol in diamond
			for (int j = 0; j < (i - 1) * 2; j++) {
				System.out.print(c);
			}
			if (i == 0) {
				// throws cursor to the next line as first row will have one symbol
				System.out.print("\n");
			} else {
				// prints symbol and throws cursor to the next line
				System.out.print(c + "\n");
			}
		}
		// prints lower section of the pattern
		for (int i = n - 1; i >= 1; i--) {
			// print spaces from left
			for (int j = n; j > i; j--) {
				System.out.print(" ");
			}
			// print symbol of  diamond
			for (int j = 0; j < (i - 1) * 2; j++) {
				System.out.print(c);
			}
			if (i == 0) {
				// throws cursor to the next line because last row will have one symbol
				System.out.print("\n");
			} else {
				// prints symbol and throws cursor to the next line
				System.out.print(c + "\n");
			}
		}
	}
}

Output

Enter Pattern Size : 
8
Enter Symbol : X
       X
      XXX
     XXXXX
    XXXXXXX
   XXXXXXXXX
  XXXXXXXXXXX
 XXXXXXXXXXXXX
XXXXXXXXXXXXXXX
 XXXXXXXXXXXXX
  XXXXXXXXXXX
   XXXXXXXXX
    XXXXXXX
     XXXXX
      XXX
       X

Diamond Pattern Java Program: While Loop

This Diamond Java Program is following the below while loop logic:

package _1_patterns.diamond;

import java.util.Scanner;

public class DiamondPatterWhileLoop {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println("Enter Pattern Size : ");
		int size = sc.nextInt();

		System.out.print("Enter Symbol : ");
		char symbol = sc.next().charAt(0);

		drawDiamondPattern(size, symbol);

		// Close Scanner
		sc.close();
	}

	private static void drawDiamondPattern(int n, char c) {

		// prints upper section of the pattern
		int i = 0;
		while (i <= n) {
			// print spaces from left
			int j = n;
			while (j > i) {
				System.out.print(" ");
				j--;
			}
			// print symbol in diamond
			j = 0;
			while (j < (i - 1) * 2) {
				System.out.print(c);
				j++;
			}
			if (i == 0) {
				// throws cursor to the next line as first row will have one symbol
				System.out.print("\n");
			} else {
				// prints symbol and throws cursor to the next line
				System.out.print(c + "\n");
			}
			i++;
		}
		// prints lower section of the pattern
		i = n - 1;
		while (i >= 1) {
			// print spaces from left
			int j = n;
			while (j > i) {
				System.out.print(" ");
				j--;
			}
			// print symbol of diamond
			j = 0;
			while (j < (i - 1) * 2) {
				System.out.print(c);
				j++;
			}
			if (i == 0) {
				// throws cursor to the next line because last row will have one symbol
				System.out.print("\n");
			} else {
				// prints symbol and throws cursor to the next line
				System.out.print(c + "\n");
			}
			i--;
		}
	}
}

Output

Enter Pattern Size : 
8
Enter Symbol : $
       $
      $$$
     $$$$$
    $$$$$$$
   $$$$$$$$$
  $$$$$$$$$$$
 $$$$$$$$$$$$$
$$$$$$$$$$$$$$$
 $$$$$$$$$$$$$
  $$$$$$$$$$$
   $$$$$$$$$
    $$$$$$$
     $$$$$
      $$$
       $

Diamond Pattern Java Program: Do-While Loop

This Diamond Java Program is following the below do-while loop logic:

package _1_patterns.diamond;

import java.util.Scanner;

public class DiamondPatterDoWhileLoop {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println("Enter Pattern Size : ");
		int size = sc.nextInt();

		System.out.print("Enter Symbol : ");
		char symbol = sc.next().charAt(0);

		drawDiamondPattern(size, symbol);

		// Close Scanner
		sc.close();
	}

	private static void drawDiamondPattern(int n, char c) {

		// prints upper section of the pattern
		int i = 0;
		do {
			// print spaces from left
			int j = n;
			do {
				System.out.print(" ");
				j--;
			} while (j > i);
			// print symbol in diamond
			j = 0;
			do {
				System.out.print(c);
				j++;
			} while (j < (i - 1) * 2);
			if (i == 0) {
				// throws cursor to the next line as first row will have one symbol
				System.out.print("\n");
			} else {
				// prints symbol and throws cursor to the next line
				System.out.print(c + "\n");
			}
			i++;
		} while (i <= n);
		// prints lower section of the pattern
		i = n - 1;
		do {
			// print spaces from left
			int j = n;
			do {
				System.out.print(" ");
				j--;
			} while (j > i);
			// print symbol of diamond
			j = 0;
			do {
				System.out.print(c);
				j++;
			} while (j < (i - 1) * 2);
			if (i == 0) {
				// throws cursor to the next line because last row will have one symbol
				System.out.print("\n");
			} else {
				// prints symbol and throws cursor to the next line
				System.out.print(c + "\n");
			}
			i--;
		} while (i >= 1);
	}
}

Output

Enter Pattern Size : 
8
Enter Symbol : #
       #
      ###
     #####
    #######
   #########
  ###########
 #############
###############
 #############
  ###########
   #########
    #######
     #####
      ###
       #

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