how to check the else statement in if else condition

package react;

import java.util.Scanner;

public class Intputfromuser {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		
		System.out.println("enter a number to compare with number 5 ");
		Scanner input= new Scanner(System.in);
		int a=input.nextInt();
		if(a==2)
		{
            System.out.println("U Have Entered The same value");
	    }
		else if(a<2)
		{
			System.out.println("Ur number is Smaller than 2");
		}
		else if(a>2)
		{
			System.out.println("U Have Entered the number Greater than ");
		}
		else {
			System.out.println("U Have Enterer Invalid Input");
		}

	}
}

how to get only integer from the user if the user enters any thing except integer then else statement should run

Use input.nextLine() instead and parse it to a String.

To avoid a ParseException, surround it by using a try { ... } catch() { ... } block.

In the catch block you can e.g. print a message informing the user of the wrong input.

public static void main(String[] args) {
    System.out.println("enter a number to compare with number 5 ");

    Scanner s = new Scanner(System.in);

    String userInput = s.nextLine();

    try {
        int option = Integer.parseInt(userInput);

        if (option == 2)
        {
            System.out.println("U Have Entered The same value");
        }
        else if (option < 2)
        {
            System.out.println("Ur number is Smaller than 2");
        }
        else if (option > 2)
        {
            System.out.println("U Have Entered the number Greater than 2");
        }
    } catch (NumberFormatException e) {
        System.out.println("Invalid input!");
    }
}

Hope this sort of helped!

You can also create method to collect input and make it inside loop like this:

   import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        System.out.print("enter a number to compare with number 5: ");

        int userInput = getInteger();


        if (userInput == 2)
        {
            System.out.println("U Have Entered The same value");
        }
        else if (userInput < 2)
        {
            System.out.println("Ur number is Smaller than 2");
        }
        else {
            System.out.println("U Have Entered the number Greater than 2");
        }
    }

    static int getInteger() {
        boolean correct = false;
        Scanner input = new Scanner(System.in);
        int userInput = 0;
        do {
            try {
                userInput = input.nextInt();
                correct = true;
            } catch (Exception e) {
                System.out.println("Incorrect input");
                System.out.println("Please try again: ");
            } finally {
                input.nextLine();
            }
        }
        while (!correct);
        input.close();
        return userInput;
    }
}

Important note with scanner.nextInt() or scanner.nextDouble()
you need to call scanner.nextLine() after that to clear input. Otherwise you will end up with endless loop.

Another alternative. Be sure to read the comments in code:

public static void main(String[] args) {
/* Open a keyboard input stream. There is no need to close 
this stream. The JVM will do that automatically when the
application closes.               */
Scanner input = new Scanner(System.in);
String val = "";    // Used to store User input:
// User Prompt with 'quit' capability and entry validation:
while (val.isEmpty()) {
System.out.print("Enter a number to compare with number 5 (q to quit): -> ");
val = input.nextLine().trim(); // Trim in case just a whitespace(s) was entered.
// Was 'q' for quit supplied?
if (val.equalsIgnoreCase("q")) {
/* Yes...then quit. Returning out of main() effectively 
closes this particular application:             */
System.out.println("Quiting - Bye Bye");
return;
}
// Validate Entry:
/* Is entry a string representation of a signed or unsigned Integer 
value and does the supplied value fall within the relm of an int? */
if (!val.matches("-?\\d+") || (Long.parseLong(val) < Integer.MIN_VALUE) || 
(Long.parseLong(val) > Integer.MAX_VALUE)) {
// No...Inform User and allow to try again:
System.out.println("Invalid Numerical Entry! {" + val + ") Try again..." 
+ System.lineSeparator());
val = "";   // Empty variable to ensure re-loop:
}
}
// If you make it to this point in code, the User input was valid!
// Now parse the String numerical value to an int:
int a = Integer.parseInt(val);
/* At this point, there are only three usable conditions:
Equal To, Less Than, and Greater Than (validity has
already been handled within the `while` loop:     */
// Equal To:
if (a == 5) {
System.out.println("You have entered The same value.");
}
// Less Than:
else if (a < 5) {
System.out.println("Your number is smaller than 5.");
}
// Greater Than:
else {
System.out.println("You have entered a number greater than 5.");
}
// DONE
}