Java I/O How to - Read an int from Standard Input with Scanner

Question

We would like to know how to read an int from Standard Input with Scanner.

Answer

/* w  w  w  .  j a v a2  s  .c  o  m*/
import java.util.Scanner;
public class Main {
  public static void main(String[] ap) {
    int val;
    try {
      Scanner sc = new Scanner(System.in);      // Requires J2SE 1.5
      val = sc.nextInt();
    } catch (NumberFormatException ex) {
      System.err.println("Not a valid number: " + ex);
      return;
    }
    System.out.println("I read this number: " + val);
  }
}

The code above generates the following result.