Java Program to Print Star Patterns

This tutorial demonstrates about how to print interesting star pattern programs in java language.

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What is start pattern?

Star patterns are the shapes drawn on the console window using asterisk or star (*) symbol.

For this we have to use different nested loops to repeatedly draw the stars on the screen.

Example - Star Pattern 1

public class StarPatternEx 
{
	public static void main(String[] args) 
	{
		int rows = 4;
		for(int i=1;i<=rows;i++) // single row
		{
			for(int j=1;j<=i;j++) // repeat in rows
			{
				System.out.print("*"); // print stars
			}
			System.out.print("\n");	// move to new line
		}
	}
}                          

Output

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Example - Star Pattern 2

public class StarPatternEx 
{
	public static void main(String[] args) 
	{
		for(int i=1;i<=4;i++) // single row
		{
			for(int j=i;j<=4;j++) // repeat in rows
			{
				System.out.print("*"); // print stars
			}
			System.out.print("\n");	// move to new line
		}
	}
}

Output

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Example - Star Pattern 3

public class StarPatternEx 
{
	public static void main(String[] args) 
	{
		int firstRowStars = 1;
		int rows = 3;
		int maxSpaces=rows-1;
		
		for(int i=0;i<rows;i++)
		{
			for(int j=maxSpaces;j>i;j--)
			{
				System.out.print(" ");
			}
				
			for(int k=0;k<firstRowStars;k++)
			{
				System.out.print("*");
			}
			firstRowStars += 2;
			System.out.print("\n");
		}
	}
}

Output

   *
  ***
 *****

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Example - Star Pattern 4

public class StarPatternEx 
{
	public static void main(String[] args) 
	{
		int firstRowStars = 5;
		int rows = firstRowStars /2;
		int maxSpaces=firstRowStars-rows;
		
		for(int i=maxSpaces;i>=1;i--)
		{
			for(int j=maxSpaces;j>=i;j--)
			{
				System.out.print(" ");
			}
				
			for(int k=1;k<=firstRowStars;k++)
			{
				System.out.print("*");
			}
			firstRowStars -= 2;
			System.out.print("\n");
		}
	}
}  

Output

 *****
  ***
   *

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Example - Star Pattern 5

public class StarPatternEx 
{
	public static void main(String[] args) 
	{
		int rows = 4;
		int columns = 4;
		for(int i=1;i<=rows;i++)
		{
			for(int j=1;j<=columns;j++)
			{
				System.out.print("*");
			}
			System.out.print("\n");
		}
	}
}

Output

****
****
****
****