// equalshashcode/MapEntry.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// A simple Map.Entry for sample Map implementations
import java.util.*;

public class MapEntry<K, V> implements Map.Entry<K, V> {
 private K key;
 private V value;
 public MapEntry(K key, V value) {
 this.key = key;
 this.value = value;
 }
 @Override
 public K getKey() { return key; }
 @Override
 public V getValue() { return value; }
 @Override
 public V setValue(V v) {
 V result = value;
 value = v;
 return result;
 }
 @Override
 public int hashCode() {
 return Objects.hash(key, value);
 }
 @SuppressWarnings("unchecked")
 @Override
 public boolean equals(Object rval) {
 return rval instanceof MapEntry &&
 Objects.equals(key,
 ((MapEntry<K, V>)rval).getKey()) &&
 Objects.equals(value,
 ((MapEntry<K, V>)rval).getValue());
 }
 @Override
 public String toString() {
 return key + "=" + value;
 }
}