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Right Triangle Star Pattern in Java

Java program to print a right-angled triangle star pattern using nested loops.

Last updated: 11 January 2026

Method 1: Using Nested For Loops

Standard approach.

Main.javaRun in Compiler →
public class RightTriangle {
    public static void main(String[] args) {
        int rows = 5;

        for (int i = 1; i <= rows; ++i) {
            for (int j = 1; j <= i; ++j) {
                System.out.print("* ");
            }
            System.out.println();
        }
    }
}
Output:
* 
* * 
* * * 
* * * * 
* * * * *

Explanation

Outer loop runs for each row. Inner loop prints stars equal to the current row number.

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