Thread: check if a number is an integer

whats best way to check if a number is an integer?

Ive heard of doing it this way

        test = Math.floor(num1);
        if(test == num1)
            System.out.println("integer");

any other ways? (and is there any time where i could run into a problem with this method?)

Hello rsala004.

It could also be done like this:

import java.util.Scanner;
 
public class Konnor {
 
    public static void main(String[] args){
 
          System.out.println("Enter Integer Value: ");
          Scanner sc = new Scanner(System.in);
 
          try { 
          int myInt = Integer.parseInt(sc.next()); 
          System.out.println("Integer value is: " + myInt); 
          } 
          catch(NumberFormatException e) { 
          System.out.println("You have not entered an Integer!"); 
          }
 
    }
 
}

if (a == (int) a)

Where a is any primitive data type byte, short, int, long, float, double, or char. If you want to test larger numbers, use long.

if (a == (long) a)