Method public static int parseInt(String s , int radix) from class Integer returns 0 when s = "-" and radix is valid radix instead should thowing exception
NumberFormatException.

public class IntegerTest {

  public static void main(String[] argv) {
    int i = Integer.parseInt("-", 10);
    System.out.println("Result i = " + i + ", Expected NumberFormatException");
  }
}