input demo in Java

import java.util.Scanner;

public class testJava
{
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.print("Enter some numbers: ");
int sum = 0;
while (in.hasNextInt()) {
sum += in.nextInt();
}
System.out.println("sum == " + sum);
in.close();
}
}