RailroadRushHour

java.lang.Object
- RailroadRushHour

```
public class RailroadRushHour
extends java.lang.Object
```
RailroadRushHour - a model for the Railroad Rush Hour puzzle (http://www.puzzles.com/puzzlesineducation/plans/rushhourguide.pdf ; http://en.wikipedia.org/wiki/Rush_Hour_(board_game) ; ) To use, one creates a RailroadRushHour object and then adds Piece objects via the object's addPiece(Piece) method. The first object added is assumed to be the goal piece, and the goal piece position is defined via the constructor. The String representation is a grid of characters where '+' is an empty space, and a Piece character represents the piece in all spaces that piece occupies.

Field Summary

Fields
Modifier and Type	Field and Description
`static char`	`BLANK` character representation for an empty (blank) board space
`char[][]`	`board` characters are used to track the occupancy of grid cells
`static int`	`SIZE` number of interior grid squares on a side

Constructor Summary

Constructors
Constructor and Description

RailroadRushHour(int goalRow, int goalCol)
Create an empty board, ready for piece addition via addPiece(Piece).

Constructors
Constructor and Description
`RailroadRushHour(int goalRow, int goalCol)` Create an empty board, ready for piece addition via addPiece(Piece).

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addPiece(Piece newPiece)` Add a piece to the board.
`static RailroadRushHour`	`expert40()` Return the last expert Railroad Rush Hour puzzle, the most difficult of the set.
`java.util.ArrayList<PieceMove>`	`getLegalMoves()` Return a list of legal moves for the current puzzle state.
`boolean`	`isSolved()` Return whether or not this puzzle is solved.
`static RailroadRushHour`	`junior1()` Return the first junior Railroad Rush Hour puzzle.
`static RailroadRushHour`	`junior10()` Return the last junior Railroad Rush Hour puzzle.
`java.lang.String`	`toString()` Return the String representation of the current puzzle state as a grid of characters that are either (1) the character of the piece occupying the grid cell, or (2) a '+' if the grid cell is empty.
`boolean`	`tryMove(java.lang.String moveDescription)` Given a move description (a length 2 String with a piece character followed by a direction character), attempt to make the move, and return whether or not it was legal and successful.

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

- Field Detail
  - SIZE
```
public static final int SIZE
```
    number of interior grid squares on a side
    
    See Also:
    
    Constant Field Values
  - BLANK
```
public static final char BLANK
```
    character representation for an empty (blank) board space
    
    See Also:
    
    Constant Field Values
  - board
```
public char[][] board
```
    characters are used to track the occupancy of grid cells
- Constructor Detail
  - RailroadRushHour
```
public RailroadRushHour(int goalRow,
                        int goalCol)
```
    Create an empty board, ready for piece addition via addPiece(Piece).
    
    Parameters:
    
    goalRow - goal row for goal piece
    
    goalCol - goal column for goal piece
- Method Detail
  - addPiece
```
public void addPiece(Piece newPiece)
```
    Add a piece to the board. This is assumed to be a legal placement that is (1) in bounds, and (2) overlaps no previously added piece.
    
    Parameters:
    
    newPiece - new piece to be added to the board
  - tryMove
```
public boolean tryMove(java.lang.String moveDescription)
```
    Given a move description (a length 2 String with a piece character followed by a direction character), attempt to make the move, and return whether or not it was legal and successful.
    
    Parameters:
    
    moveDescription - a length 2 String with a piece character followed by a direction character
    
    Returns:
    
    whether or not the given move was legal and successful
  - isSolved
```
public boolean isSolved()
```
    Return whether or not this puzzle is solved.
    
    Returns:
    
    whether or not this puzzle is solved
  - getLegalMoves
```
public java.util.ArrayList<PieceMove> getLegalMoves()
```
    Return a list of legal moves for the current puzzle state. If the puzzle is solved, return an empty list.
    
    Returns:
    
    a list of legal moves for the current puzzle state
  - toString
```
public java.lang.String toString()
```
    Return the String representation of the current puzzle state as a grid of characters that are either (1) the character of the piece occupying the grid cell, or (2) a '+' if the grid cell is empty.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    the String representation of the current puzzle state as a grid of characters that are either (1) the character of the piece occupying the grid cell, or (2) a '+' if the grid cell is empty.
    
    See Also:
    
    Object.toString()
  - junior1
```
public static RailroadRushHour junior1()
```
    Return the first junior Railroad Rush Hour puzzle.
    
    Returns:
    
    the first junior Railroad Rush Hour puzzle
  - junior10
```
public static RailroadRushHour junior10()
```
    Return the last junior Railroad Rush Hour puzzle.
    
    Returns:
    
    the last junior Railroad Rush Hour puzzle
  - expert40
```
public static RailroadRushHour expert40()
```
    Return the last expert Railroad Rush Hour puzzle, the most difficult of the set.
    
    Returns:
    
    the last expert Railroad Rush Hour puzzle, the most difficult of the set

Class RailroadRushHour

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SIZE

BLANK

board

Constructor Detail

RailroadRushHour

Method Detail

addPiece

tryMove

isSolved

getLegalMoves

toString

junior1

junior10

expert40