Class Parser

java.lang.Object
  Parser

public class Parser
extends java.lang.Object

This class is used to get user input from the keyboard. For full details of the Parser class, see Lab 9. This class does not have a constructor, and all it's methods are static. Thus, they are called by Parser.parse(), for example.

Field Summary

static int	ATTACK The value that parse() returns if the user enters 'attack' to attack the creature in the room.
static int	DO_NOT_UNDERSTAND The value that parse() returns if it did not understand what the user entered.
static int	EAST The value that parse() returns if the user enters 'east' to move to the room to the east.
static int	GET The value that parse() returns if the user enters 'get' to pick up the weapon in the room.
static int	LOOK The value that parse() returns if the user enters 'look' to see the room description again.
static int	NORTH The value that parse() returns if the user enters 'north' to move to the room to the north.
static int	QUIT The value that parse() returns if the user enters 'quit' to quit the game.
static int	SOUTH The value that parse() returns if the user enters 'south' to move to the room to the south.
static int	WEST The value that parse() returns if the user enters 'west' to move to the room to the west.

Method Summary

static boolean	askYesNoQuestion(java.lang.String prompt) This method asks the question passed as a parameter, and keeps asking it until a yes or no answer is obtained.
static int	parse() This method reads in the user's input from the keyboard, and returns a value corresponding to what the user entered.
static void	printCommands() This method prints the available command to the screen.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NORTH

public static final int NORTH

The value that parse() returns if the user enters 'north' to move to the room to the north.

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Constant Field Values

EAST

public static final int EAST

The value that parse() returns if the user enters 'east' to move to the room to the east.

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Constant Field Values

SOUTH

public static final int SOUTH

The value that parse() returns if the user enters 'south' to move to the room to the south.

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Constant Field Values

WEST

public static final int WEST

The value that parse() returns if the user enters 'west' to move to the room to the west.

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Constant Field Values

ATTACK

public static final int ATTACK

The value that parse() returns if the user enters 'attack' to attack the creature in the room.

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Constant Field Values

LOOK

public static final int LOOK

The value that parse() returns if the user enters 'look' to see the room description again.

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Constant Field Values

GET

public static final int GET

The value that parse() returns if the user enters 'get' to pick up the weapon in the room.

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Constant Field Values

QUIT

public static final int QUIT

The value that parse() returns if the user enters 'quit' to quit the game.

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Constant Field Values

DO_NOT_UNDERSTAND

public static final int DO_NOT_UNDERSTAND

The value that parse() returns if it did not understand what the user entered.

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Constant Field Values

Method Detail

printCommands

public static void printCommands()

This method prints the available command to the screen. The commands correspond to the field values shown above.

parse

public static int parse()

This method reads in the user's input from the keyboard, and returns a value corresponding to what the user entered. The method only really looks at the first character entered, and ignores case. Thus, 'aardvark' and 'APPLE' will both return ATTACK. The values returned are the fields listed above.

Returns:

An int value indicating what the user entered.

askYesNoQuestion

public static boolean askYesNoQuestion(java.lang.String prompt)

This method asks the question passed as a parameter, and keeps asking it until a yes or no answer is obtained.

Parameters:

prompt - The question to ask.

Returns:

true if the user entered yes, false if the user entered no