Java: Generate a following *'s triangle

Last update on April 10 2025 05:37:38 (UTC/GMT +8 hours)

Reverse * Triangle

Write a Java program to generate the following * triangles.

Test Data
Input number of rows: 6

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise23 {
   public static void main(String args[]) 
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input the number: ");
        int n = in.nextInt();
        for (int i = n; i > 0; i--) 
        {
            for (int spc = n - i; spc > 0; spc--) 
            {
                System.out.print(" ");
            }
            for (int j = 0; j < i; j++) 
            {
                System.out.print("*");
            }
            System.out.println();
        }
    }

}

Sample Output:

Input the number: 6                                                                                           
******                                                                                                       
 *****                                                                                                       
  ****                                                                                                       
   ***                                                                                                       
    **                                                                                                       
     *

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to generate a reverse star triangle using a while loop.
• Write a Java program to print a reverse star triangle pattern recursively.
• Write a Java program to generate a reverse star triangle and then mirror it to create a symmetric design.
• Write a Java program to produce a reverse triangle pattern using a user-specified symbol instead of an asterisk.

Java Code Editor:

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