Java Program to Print Rhombus Star Pattern

Write a Java Program to print rhombus star pattern using for loop. This rhombus star example uses multiple for loops nested inside a for loop to iterate the rhombus rows.

package ShapePrograms;

import java.util.Scanner;

public class RhombusPattern1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Rhombus Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("-- Printing Rhombus Pattern of Stars ---");
		
		for (int i = 1 ; i <= rows; i++ ) 
		{
			for (int j = 1 ; j <= rows - i; j++ ) 
			{
				System.out.print(" ");
			}
			for (int k = 1 ; k <= rows; k++ ) 
			{
				System.out.print("*");
			}
			System.out.println();
		}
	}
}

In this rhombus star pattern program, we replaced the nested for loop with while loops.

package ShapePrograms;

import java.util.Scanner;

public class RhombusPattern2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Rhombus Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("--- Printing Rhombus Pattern of Stars ---");
		int i = 1 ;
		while( i <= rows ) 
		{
			int j = 1;
			while(j <= rows - i) 
			{
				System.out.print(" ");
				j++;
			}
			int k = 1;
			while(k <= rows) 
			{
				System.out.print("*");
				k++;
			}
			System.out.println();
			i++;
		}
	}
}

Please Enter Rhombus Pattern Rows = 12
--- Printing Rhombus Pattern of Stars ---
           ************
          ************
         ************
        ************
       ************
      ************
     ************
    ************
   ************
  ************
 ************
************

Java Program to Print Rhombus Star Pattern using do while loop

package ShapePrograms;

import java.util.Scanner;

public class RhombusPattern3 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Rhombus Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("-- Printing Rhombus Pattern of Stars ---");
		int i = 1 ;
		do
		{
			int j = 1;
			do 
			{
				System.out.print(" ");
			}while(j++ <= rows - i);
			int k = 1;
			do
			{
				System.out.print("*");
			}while(++k <= rows);
			System.out.println();
			i++;
		}while(i <= rows);
	}
}

Please Enter Rhombus Pattern Rows = 10
-- Printing Rhombus Pattern of Stars ---
          **********
         **********
        **********
       **********
      **********
     **********
    **********
   **********
  **********
 **********

In this example, the RhombusPattern function prints the rhombus pattern of a user-given symbol.

package ShapePrograms;

import java.util.Scanner;

public class RhombusPattern4 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Rows = ");
		int rows = sc.nextInt();
		
		System.out.print("Please Enter Character for Rhombus Pattern = ");
		char ch = sc.next().charAt(0);
		
		System.out.println("---- Printing Rhombus Pattern ------");
		RhombusPattern(rows, ch);
		
	}
	public static void RhombusPattern(int rows, char ch) {
		for (int i = 1 ; i <= rows; i++ ) 
		{
			for (int j = 1 ; j <= rows - i; j++ ) 
			{
				System.out.print(" ");
			}
			for (int k = 1 ; k <= rows; k++ ) 
			{
				System.out.print(ch);
			}
			System.out.println();
		}
	}
}

Please Enter Rows = 15
Please Enter Character for Rhombus Pattern = #
---- Printing Rhombus Pattern ------
              ###############
             ###############
            ###############
           ###############
          ###############
         ###############
        ###############
       ###############
      ###############
     ###############
    ###############
   ###############
  ###############
 ###############
###############