Command

java.lang.Object
- Command

```
class Command
extends java.lang.Object
```
This class is the main class of the "World of Zuul" application. "World of Zuul" is a very simple, text based adventure game. This class holds information about a command that was issued by the user. A command currently consists of two strings: a command word and a second word (for example, if the command was "take map", then the two strings obviously are "take" and "map"). The way this is used is: Commands are already checked for being valid command words. If the user entered an invalid command (a word that is not known) then the command word is . If the command had only one word, then the second word is .

Version:

1.0 (February 2002)

Author:

Michael Kolling and David J. Barnes

Field Summary

Fields
Modifier and Type Field Description

private java.lang.String commandWord

private java.lang.String secondWord

Constructor Summary

Constructors
Constructor Description

Command(java.lang.String firstWord, java.lang.String secondWord)
Create a command object.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.String`	`getCommandWord()`	Return the command word (the first word) of this command.
`java.lang.String`	`getSecondWord()`	Return the second word of this command.
`boolean`	`hasSecondWord()`	Return true if the command has a second word.
`boolean`	`isUnknown()`	Return true if this command was not understood.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - commandWord
```
private java.lang.String commandWord
```
  - secondWord
```
private java.lang.String secondWord
```
- Constructor Detail
  - Command
```
public Command(java.lang.String firstWord,
               java.lang.String secondWord)
```
    Create a command object. First and second word must be supplied, but either one (or both) can be null. The command word should be null to indicate that this was a command that is not recognised by this game.
- Method Detail
  - getCommandWord
```
public java.lang.String getCommandWord()
```
    Return the command word (the first word) of this command. If the command was not understood, the result is null.
  - getSecondWord
```
public java.lang.String getSecondWord()
```
    Return the second word of this command. Returns null if there was no second word.
  - isUnknown
```
public boolean isUnknown()
```
    Return true if this command was not understood.
  - hasSecondWord
```
public boolean hasSecondWord()
```
    Return true if the command has a second word.