Stack and Queue

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Stack and Queue

Consider a class called Configuration. This class â??encapsulatesâ?? the configuration management for any software system. For example, once created, the user can simply ask the configuration object for value(s) to a certain configuration key. Letâ??s take a look at a few examples:
String filename = â??config.txtâ??;
Configuration config = new Configuration( new File(filename) );
int numUser = config.getInteger( â??num_usersâ?? );
String name = config.getString( â??player1â?? );
In the above example, the config object is constructed and its contents are expressed in the file config.txt. The format of the config.txt file is as followed.
key = value
key2 = value2
## lines with comments begins with the #

The complete Configuration class should implement the following methods:
Class Configuration {
// constructors
Configuration() { â?¦ }
Configuration( File file) { â?¦ }
Configuration(String filename) { â?¦ }
// accessors
int getSize() { â?¦ }
String getString( String key ) { â?¦ }
int getInteger( String key ) { â?¦ }
String[] getKeys() { â?¦ } // return all keys
// mutators
void push(String key, String value) { }
String[] pop() { } // returns String array[] = { key, value }
}

Your Configuration class will have two sub classes: (1) ConfigurationQueue and (2)
ConfigurationStack. The push and pop functions will behave differently depending on whether your class is a Queue or a Stack.

Your App class is given and you should not change this class at all. Your homework will require creating three files: Configuration.java ConfigurationQueue.java and ConfigurationStack.java.
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