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
@throws ClassCastException if the specified key cannot be compared with the keys currently in the map
@throws NullPointerException if the specified key is null and this map uses natural ordering, or its comparator does not permit null keys
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.