Introduction

In this demo I have used NetBeans IDE 8.2 for debugging purpose. But you can use any java programming language compiler as per your availability..

 
import java.util.Scanner;
public class JavaExcercise {
 
  public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
 
        System.out.print("Enter first number: ");
        int num1 = in.nextInt();
        System.out.print("Enter second number: ");
        int num2 = in.nextInt();
        System.out.print("Enter third number: ");
        int num3 = in.nextInt();
 
        if (num1 == num2 && num1 == num3)
        {
            System.out.println("All numbers are equal");
        }
        else if ((num1 == num2) || (num1 == num3) || (num3 == num2))
        {
            System.out.println("Neither all are equal or different");
        }
        else
        {
            System.out.println("All numbers are different");
        }
    }
}

Result