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[Java] Hollow Diamond Pattern Java Program

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In this “Hollow 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 Hollow Diamond Pattern following this logic,

  • Hollow 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 symbol and spaces before second symbol
  • Once last symbol print jump cursor to next row (\n)
Hollow Diamond Pattern

This post covers following ways to print Hollow Diamond Pattern:

  • Hollow Diamond Pattern Java Program: Using for Loop
  • Hollow Diamond Pattern Java Program: Using While Loop
  • Hollow Diamond Pattern Java Program : Using Do-While Loop

Hollow Diamond Pattern Java Program: For Loop

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

package _1_patterns.hollow_diamond;

import java.util.Scanner;

public class HollowDiamondPatterForLoop {

	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);

		drawHollowDiamondPattern(size, symbol);

		// Close Scanner
		sc.close();
	}

	private static void drawHollowDiamondPattern(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(" ");
			}
			// prints symbol
			System.out.print(c);
			// print spaces in diamond
			for (int j = 1; j < (i - 1) * 2; j++) {
				System.out.print(" ");
			}
			if (i == 1) {
				// 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(" ");
			}
			// prints symbol
			System.out.print(c);
			// print spaces of hollow diamond
			for (int j = 1; j < (i - 1) * 2; j++) {
				System.out.print(" ");
			}
			if (i == 1) {
				// 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
      X X
     X   X
    X     X
   X       X
  X         X
 X           X
X             X
 X           X
  X         X
   X       X
    X     X
     X   X
      X X
       X

Hollow Diamond Pattern Java Program: While Loop

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

package _1_patterns.hollow_diamond;

import java.util.Scanner;

public class HollowDiamondPatterWhileLoop {

	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);

		drawHollowDiamondPattern(size, symbol);

		// Close Scanner
		sc.close();
	}

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

		// prints upper section of the pattern
		int i = 1;
		while (i <= n) {
			// print spaces from left
			int j = n;
			while (j > i) {
				System.out.print(" ");
				j--;
			}
			// prints symbol
			System.out.print(c);
			// print spaces in diamond
			j = 1;
			while (j < (i - 1) * 2) {
				System.out.print(" ");
				j++;
			}
			if (i == 1) {
				// 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--;
			}
			// prints symbol
			System.out.print(c);
			// print spaces of hollow diamond
			j = 1;
			while (j < (i - 1) * 2) {
				System.out.print(" ");
				j++;
			}
			if (i == 1) {
				// 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 : &
       &
      & &
     &   &
    &     &
   &       &
  &         &
 &           &
&             &
 &           &
  &         &
   &       &
    &     &
     &   &
      & &
       &

Hollow Diamond Pattern Java Program: Do-While Loop

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

package _1_patterns.hollow_diamond;

import java.util.Scanner;

public class HollowDiamondPatterDoWhileLoop {

	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);

		drawHollowDiamondPattern(size, symbol);

		// Close Scanner
		sc.close();
	}

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

		// prints upper section of the pattern
		int i = 1;
		do {
			// print spaces from left
			int j = n;
			do {
				System.out.print(" ");
				j--;
			} while (j > i);
			// prints symbol
			System.out.print(c);
			// print spaces in diamond
			j = 1;
			do {
				System.out.print(" ");
				j++;
			} while (j < (i - 1) * 2);
			if (i == 1) {
				// 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);
			// prints symbol
			System.out.print(c);
			// print spaces of hollow diamond
			j = 1;
			do {
				System.out.print(" ");
				j++;
			} while (j < (i - 1) * 2);
			if (i == 1) {
				// 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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