Programs to check whether the given number is an Integer or not:                                         

package quipoin.javaeasyprograms;
import java.util.Scanner;

public class IntegerOrNot {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter the number:");
		String s = sc.nextLine();
		try {
			Integer.parseInt(s);
			System.out.println(s + " is an Integer");
		} catch (NumberFormatException e) {
			System.out.println(s + " is not an Integer");
		}
		sc.close();
	}
}

Output:

Enter the number:
 125
125 is an Integer
Enter the number:
 552a
552a is not an Integer
Enter the number:
 55.2
55.2 is not an Integer