Java中的Map【五】ConcurrentNavigableMap接口-蒲公英云

Java中的Map【五】ConcurrentNavigableMap接口

所使用的jdk版本为1.8版本，先看一下ConcurrentNavigableMap在JDK中Map的UML类图中的位置：

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2.1.5 ConcurrentNavigableMap接口

   通过对前面NavigableMap接口和ConcurrentMap接口的分析，ConcurrentNavigableMap接口就很简单了，从定义上看，它继承了NavigableMap和ConcurrentMap这两个接口子Map，就是两者功能的结合，既保证线程安全性，又提供导航搜索子Map视图的功能。ConcurrentNavigableMap中定义的方法也很简单，跟NavigableMap中的方法类似，只不过NavigableMap中返回的子Map视图是NavigableMap类型，而在ConcurrentNavigableMap中返回的都是ConcurrentNavigableMap类型，比如：
public interface ConcurrentNavigableMap<K,V>
    extends ConcurrentMap<K,V>, NavigableMap<K,V>
{
    /**
     * @throws ClassCastException       {@inheritDoc}
     * @throws NullPointerException     {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     */
    ConcurrentNavigableMap<K,V> subMap(K fromKey, boolean fromInclusive,
                                       K toKey,   boolean toInclusive);
    /**
     * @throws ClassCastException       {@inheritDoc}
     * @throws NullPointerException     {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     */
    ConcurrentNavigableMap<K,V> headMap(K toKey, boolean inclusive);
    /**
     * @throws ClassCastException       {@inheritDoc}
     * @throws NullPointerException     {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     */
    ConcurrentNavigableMap<K,V> tailMap(K fromKey, boolean inclusive);