//: c09:MPair.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// A Map implemented with ArrayLists.
import java.util.*;

public class MPair 
implements Map.Entry, Comparable {
  Object key, value;
  MPair(Object k, Object v) {
    key = k;
    value = v;
  }
  public Object getKey() { return key; }
  public Object getValue() { return value; }
  public Object setValue(Object v){
    Object result = value;
    value = v;
    return result;
  }
  public boolean equals(Object o) {
    return key.equals(((MPair)o).key);
  }
  public int compareTo(Object rv) {
    return ((Comparable)key).compareTo(
      ((MPair)rv).key);
  }
} ///:~