Method containsKey

src/java/org/apache/poi/util/BinaryTree.java:1364–1369

Returns true if this map contains a mapping for the specified key. @param key key whose presence in this map is to be tested. @return true if this map contains a mapping for the specified key. @exception ClassCastException if the key is of an inappropriate ty

(Object key)

     * @exception NullPointerException if the key is null
     */
    public boolean containsKey(Object key)
        throws ClassCastException, NullPointerException
    {
        checkKey(key);
        return lookup(( Comparable ) key, _KEY) != null;
    }

    /**
     * Returns true if this map maps one or more keys to the