Java: Generate a following *'s triangle

Java Conditional Statement: Exercise-23 with Solution

Write a Java program to generate the following * triangles.

Test Data
Input number of rows: 6

Pictorial Presentation:

Java conditional statement Exercises: Generate a following *'s triangle

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++) 


Sample Output:

Input the number: 6                                                                                           


Flowchart: Java Conditional Statement Exercises - Generate a following *'s triangle

Java Code Editor:

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Java: Tips of the Day


Checks if a value is positive power of two.

To understand how it works let's assume we made a call IsPowerOfTwo(4).

As value is greater than 0, so right side of the && operator will be evaluated.

The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.

The result of (value & value) is value. 100 & 100 => 100.

This will value the expression to true as value is equal to value.

public static boolean isPowerOfTwo(final int value) {
    return value > 0 && ((value & (~value + 1)) == value);

Ref: https://bit.ly/3sA5d4I


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