public class UnboxExample {
  public static int sum(int a, int b) {
     return a+b;
  }
  
  public static void main(String []args) {
    Integer a = new Integer(5);
    Integer b = new Integer(10);
    int result = sum(a.intValue(),b.intValue());
    System.out.println("sum: "+ result );
  } 
}