42 lines
1.0 KiB
Java
42 lines
1.0 KiB
Java
//: containers/MapEntry.java
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// ©2015 MindView LLC: see Copyright.txt
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// A simple Map.Entry for sample Map implementations.
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import java.util.*;
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public class MapEntry<K,V> implements Map.Entry<K,V> {
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private K key;
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private V value;
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public MapEntry(K key, V value) {
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this.key = key;
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this.value = value;
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}
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@Override
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public K getKey() { return key; }
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@Override
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public V getValue() { return value; }
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@Override
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public V setValue(V v) {
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V result = value;
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value = v;
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return result;
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}
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@Override
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public int hashCode() {
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return (key==null ? 0 : key.hashCode()) ^
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(value==null ? 0 : value.hashCode());
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}
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@Override
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public boolean equals(Object o) {
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if(!(o instanceof MapEntry)) return false;
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@SuppressWarnings("unchecked")
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MapEntry<K,V> me = (MapEntry<K,V>)o;
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return
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(key == null ?
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me.getKey() == null : key.equals(me.getKey())) &&
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(value == null ?
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me.getValue()== null : value.equals(me.getValue()));
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}
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@Override
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public String toString() { return key + "=" + value; }
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} ///:~
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