DictionaryInterface.java

// Dictionary that stores values of type Object indexed by keys of type String
interface DictionaryInterface {
	public boolean isEmpty(); // returns true if the Dictionary is empty, false otherwise.

	public int size(); // Returns the number of key/value pairs stored in the dictionary.

	// Adds a value stored under the given key. If the key has already been stored
	// in the Dictionary,
	// replaces the value associated with the key and returns the old value. If the
	// key isn't in the dictionary
	// returns null.
	public Object put(String key, Object value);

	public Object get(String key); // Retrieves the value stored with the key.

	public void remove(String key); // Deletes the key/value pair stored with the given key.

	public void clear(); // Empties the dictionary.

	public String[] getKeys(); // Returns an array of all the keys currently stored in the Dictionary.
}