Java Program to Print Right Angled Triangle Star Pattern

Write a Java Program to print right angled triangle star pattern using for loop. This right triangle star example uses a nested for loop to iterate the rows and display the output.

package ShapePrograms;

import java.util.Scanner;

public class RightTriangle1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Right Angled Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Right Angled Triangle Star Pattern");
		
		for (int i = 1 ; i <= rows; i++ ) 
		{
			for (int j = 1 ; j <= i; j++ ) 	
			{
				System.out.print("*");
			}
			System.out.println();
		}
	}
}

In this right angled triangle star pattern program, we replaced for loops with while loops.

package ShapePrograms;

import java.util.Scanner;

public class RightTriangle2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Right Angled Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Right Angled Triangle Pattern of Stars");
		int i = 1, j ;
		
		while( i <= rows ) 
		{
			j = 1 ;
			while(j <= i ) 
			{
				System.out.print("*");
				j++;
			}
			System.out.println();
			i++;
		}
	}
}

Enter Right Angled Triangle Pattern Rows = 10
Printing Right Angled Triangle Pattern of Stars
*
**
***
****
*****
******
*******
********
*********
**********

The below Program will Print Right Angled Triangle Star Pattern using do while loop.

package ShapePrograms;

import java.util.Scanner;

public class RightTriangle3 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Right Angled Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Right Angled Triangle Pattern of Stars");
		int i = 1, j ;
		
		do
		{
			j = 1 ;
			do
			{
				System.out.print("*");
			} while(++j <= i ) ;
			System.out.println();
		} while( ++i <= rows );
	}
}

Enter Right Angled Triangle Pattern Rows = 14
Printing Right Angled Triangle Pattern of Stars
*
**
***
****
*****
******
*******
********
*********
**********
***********
************
*************
**************

In this example, the RightTrianglePattern function prints the right angled triangle pattern of a given symbol.

package ShapePrograms;

import java.util.Scanner;

public class RightTriangle4 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Rows = ");
		int rows = sc.nextInt();
		
		System.out.print("Character for Right Angled Triangle Pattern = ");
		char ch = sc.next().charAt(0);
		
		System.out.println("Printing Right Angled Triangle Pattern of Stars");
		RightTrianglePattern(rows, ch);	
	}
	
	public static void RightTrianglePattern(int rows, char ch) {
		for (int i = 1 ; i <= rows; i++ ) 
		{
			for (int j = 1 ; j <= i; j++ ) 
			{
				System.out.print(ch);
			}
			System.out.println();
		}
	}
}

Enter Rows = 17
Character for Right Angled Triangle Pattern = $
Printing Right Angled Triangle Pattern of Stars
$
$$
$$$
$$$$
$$$$$
$$$$$$
$$$$$$$
$$$$$$$$
$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$$
$$$$$$$$$$$$
$$$$$$$$$$$$$
$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$