package whackamole;
import java.io.*;

public class MutInt implements Runnable, Serializable {

  private int val;

  public MutInt() {
    this(0);
  }

  public MutInt(int val) {
    this.val = val;
  }

  public MutInt add(MutInt other) {
    val += other.val;
    return this;
  }

  public String toString() {
    return "MutInt " + val;
  }

  public void run() {
    System.out.println("Value is " + this);
  }
}