Java program to check if number is a Triangle Number.

import java.util.Scanner;

// © 2017 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net

public class IsNumberSquare {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
      int n;
        
      System.out.print("Enter number: ");
      n = input.nextInt();
      
      if(isSquare(8 * n + 1)){
      	System.out.print("Number is triangle number");
      }else{
      	System.out.print("Number is not triangle number");
      }
  }
  
  static Boolean isSquare(int n)
    {
        for (int i = 0; i < n / 2 + 2; i++)
        {
            if (i * i == n)
            {
                return true;
            }
        }

        return false;
    }
}

 

Java Check If Number Is Triangle Number
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