basic methods for Maps

■   Here is where to find Map methods in the Java API.

	HashMap	TreeMap
In the Map interface	.clear( ), .containsKey(...), .containsValue(...), .entrySet( ), .get(...), .isEmpty( ), .keySet( ), .put(...), .putAll(...), .remove(...), .size( ), .values( )
In the class itself	- -	.firstKey( ), .headMap(...), .lastKey( ), .subMap(...), .tailMap(...)