public class MyFirstClass {
  protected int a;
  protected int b;
  public MyFirstClass() {  a=b=0; }
  public MyFirstClass(int a, int b) { set(a,b); }
  public void set(int a, int b) { this.a=a; this.b=b; }
  public int add() { return a+b; }
  public static void main(String args[]) {
    if (args.length==2) {
      Integer a= new Integer(args[0]);
      Integer b= new Integer(args[1]);
      MyFirstClass c= new MyFirstClass(a.intValue(),b.intValue());
      System.out.println("a+b=" + c.add());
    } else
      System.err.println("usage: java MyFirstClass <int> <int>");
  }
}