OnJava8-Examples/equalshashcode/MapEntry.java at master · xinan-w/OnJava8-Examples · GitHub

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// equalshashcode/MapEntry.java

// 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;

}

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