Board

java.lang.Object
- popinjay.Board

```
public class Board
extends java.lang.Object
```
A mutable state of the puzzle board, with some set of pieces placed on it.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`addPiece(Piece p)`	Effect: Add a piece to the board and return true.
`boolean`	`classInv()`	Invariant: All pieces fit fully on valid board points and do not overlap.
`boolean`	`open(int x, int y)`	Whether this is an unoccupied, valid board point.
`void`	`removePiece(Piece p)`	Effect: Remove a piece from the board.
`int`	`sizeX()`	The horizontal size of the board.
`int`	`sizeY()`	The vertical size of the board.
`java.lang.String`	`toString()`
`boolean`	`valid(int x, int y)`	Whether this is a valid board point.

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

- Method Detail
  - valid
```
public boolean valid(int x,
                     int y)
```
    Whether this is a valid board point.
  - open
```
public boolean open(int x,
                    int y)
```
    Whether this is an unoccupied, valid board point.
  - classInv
```
public boolean classInv()
```
    Invariant: All pieces fit fully on valid board points and do not overlap. Further, a point on the board is occupied by a piece if and only if that pieces is in the set of pieces, and it's a point that belongs to the piece.
  - addPiece
```
public boolean addPiece(Piece p)
```
    Effect: Add a piece to the board and return true. Return false if the piece can't be placed.
  - removePiece
```
public void removePiece(Piece p)
```
    Effect: Remove a piece from the board.
  - sizeX
```
public int sizeX()
```
    The horizontal size of the board.
  - sizeY
```
public int sizeY()
```
    The vertical size of the board.
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object