Class MarbleJar

java.lang.Object
  |
  +--MarbleJar

public class MarbleJar

extends java.lang.Object

This class simulates a marble jar and the actions of Adding and Drawing marbles from the jar. The simulation supports two colors (white and black).
Adapted from the C++ class written by Dave Reed
18 Sept 1998
Modified Jan 1999

Constructor Summary

MarbleJar(int black, int white)
This constructs the marble jar initializing it with the number of colors specified by the parameters.

Method Summary

void	addMarble(java.lang.String marble) This method simulates adding a new marble to the jar.
java.lang.String	drawMarble() This method simulates drawing one marble.
boolean	isEmpty() This tests if the jar is empty.
static void	main(java.lang.String[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

MarbleJar

public MarbleJar(int black,
                 int white)

This constructs the marble jar initializing it with the number of colors specified by the parameters.

Parameters:

black - The number of black marbles.

white - The number of white marbles.

Method Detail

drawMarble

public java.lang.String drawMarble()

This method simulates drawing one marble. Precondition: the marble jar is not empty.

Returns:

The string specifying color of drawn marble ("white" or "black")

addMarble

public void addMarble(java.lang.String marble)

This method simulates adding a new marble to the jar.

Parameters:

marble - This string specifies the color of the marble added to the jar. It must be either "black" or "white".

isEmpty

public boolean isEmpty()

This tests if the jar is empty.

Returns:

True if the jar is empty, false otherwise.

main

public static void main(java.lang.String[] args)