我决定解决这个问题并尽可能地使其可扩展。该解决方案允许您:
定义自己的棋盘(电话键盘,国际象棋棋盘等)。
定义自己的棋子(骑士,车,象等);您将需要编写具体类并从工厂生成它。
通过一些有用的实用程序方法检索几个信息。
以下是各个类:
PadNumber:定义电话键盘上的按钮的类。可以重命名为“Square”以表示一个棋盘方格。
ChessPiece:抽象类,定义所有棋子的字段。
Movement:接口,定义移动方法并允许生成棋子。
PieceFactory:生成棋子的工厂类。
Knight:继承自ChessPiece并实现Movement的具体类。
PhoneChess:入口类。
Driver:驱动代码。
好了,下面是代码 :)
package PhoneChess;
import java.awt.Point;
public class PadNumber {
private String number = "";
private Point coordinates = null;
public PadNumber(String number, Point coordinates)
{
if(number != null && number.isEmpty()==false)
this.number = number;
else
throw new IllegalArgumentException("Input cannot be null or empty.");
if(coordinates == null || coordinates.x < 0 || coordinates.y < 0)
throw new IllegalArgumentException();
else
this.coordinates = coordinates;
}
public String getNumber()
{
return this.number;
}
public Integer getNumberAsNumber()
{
return Integer.parseInt(this.number);
}
public Point getCoordinates()
{
return this.coordinates;
}
public int getX()
{
return this.coordinates.x;
}
public int getY()
{
return this.coordinates.y;
}
}
棋子
package PhoneChess;
import java.util.HashMap;
import java.util.List;
public abstract class ChessPiece implements Movement {
protected String name = "";
protected HashMap<PadNumber, List<PadNumber>> moves = null;
protected Integer fullNumbers = 0;
protected int[] movesFrom = null;
protected PadNumber[][] thePad = null;
}
移动界面:
package PhoneChess;
import java.util.List;
public interface Movement
{
public Integer findNumbers(PadNumber start, Integer digits);
public abstract boolean canMove(PadNumber from, PadNumber to);
public List<PadNumber> allowedMoves(PadNumber from);
public Integer countAllowedMoves(PadNumber from);
}
PieceFactory
package PhoneChess;
public class PieceFactory
{
public ChessPiece getPiece(String piece, PadNumber[][] thePad)
{
if(thePad == null || thePad.length == 0 || thePad[0].length == 0)
throw new IllegalArgumentException("Invalid pad");
if(piece == null)
throw new IllegalArgumentException("Invalid chess piece");
if(piece.equalsIgnoreCase("Knight"))
return new Knight("Knight", thePad);
else
return null;
}
}
骑士职业
package PhoneChess;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public final class Knight extends ChessPiece implements Movement {
public Knight(String name, PadNumber[][] thePad)
{
if(name == null || name.isEmpty() == true)
throw new IllegalArgumentException("Name cannot be null or empty");
this.name = name;
this.thePad = thePad;
this.moves = new HashMap<>();
}
private Integer fullNumbers = null;
@Override
public Integer findNumbers(PadNumber start, Integer digits)
{
if(start == null || "*".equals(start.getNumber()) || "#".equals(start.getNumber()) ) { throw new IllegalArgumentException("Invalid start point"); }
if(start.getNumberAsNumber() == 5) { return 0; }
if(digits == 1) { return 1; };
this.movesFrom = new int[thePad.length * thePad[0].length];
for(int i = 0; i < this.movesFrom.length; i++)
this.movesFrom[i] = -1;
fullNumbers = 0;
findNumbers(start, digits, 1);
return fullNumbers;
}
private void findNumbers(PadNumber start, Integer digits, Integer currentDigits)
{
if(currentDigits == digits)
{
currentDigits = 1;
fullNumbers++;
return;
}
if(!this.moves.containsKey(start))
allowedMoves(start);
List<PadNumber> options = this.moves.get(start);
if(options != null)
{
currentDigits++;
for(PadNumber option : options)
findNumbers(option, digits, currentDigits);
}
}
@Override
public boolean canMove(PadNumber from, PadNumber to)
{
if(!this.moves.containsKey(from.getNumber()))
{
allowedMoves(from);
}
if(this.moves.get(from) != null)
{
for(PadNumber option : this.moves.get(from))
{
if(option.getNumber().equals(to.getNumber()))
return true;
}
}
return false;
}
@Override
public List<PadNumber> allowedMoves(PadNumber from)
{
if(this.moves == null)
this.moves = new HashMap<>();
if(this.moves.containsKey(from))
return this.moves.get(from);
else
{
List<PadNumber> found = new ArrayList<>();
int row = from.getY();
int col = from.getX();
if(col-1 >= 0 && row-2 >= 0)
{
if(thePad[row-2][col-1].getNumber().equals("*") == false &&
thePad[row-2][col-1].getNumber().equals("#") == false)
{
found.add(thePad[row-2][col-1]);
this.movesFrom[from.getNumberAsNumber()] = this.movesFrom[from.getNumberAsNumber()] + 1;
}
}
if(col-1 >= 0 && row+2 < thePad.length)
{
if(thePad[row+2][col-1].getNumber().equals("*") == false &&
thePad[row+2][col-1].getNumber().equals("#") == false)
{
found.add(thePad[row+2][col-1]);
this.movesFrom[from.getNumberAsNumber()] = this.movesFrom[from.getNumberAsNumber()] + 1;
}
}
if(col+1 < thePad[0].length && row+2 < thePad.length)
{
if(thePad[row+2][col+1].getNumber().equals("*") == false &&
thePad[row+2][col+1].getNumber().equals("#") == false)
{
found.add(thePad[row+2][col+1]);
this.movesFrom[from.getNumberAsNumber()] = this.movesFrom[from.getNumberAsNumber()] + 1;
}
}
if(col+1 < thePad[0].length && row-2 >= 0)
{
if(thePad[row-2][col+1].getNumber().equals("*") == false &&
thePad[row-2][col+1].getNumber().equals("#") == false)
found.add(thePad[row-2][col+1]);
}
if(col-2 >= 0 && row-1 >= 0)
{
if(thePad[row-1][col-2].getNumber().equals("*") == false &&
thePad[row-1][col-2].getNumber().equals("#") == false)
found.add(thePad[row-1][col-2]);
}
if(col-2 >= 0 && row+1 < thePad.length)
{
if(thePad[row+1][col-2].getNumber().equals("*") == false &&
thePad[row+1][col-2].getNumber().equals("#") == false)
found.add(thePad[row+1][col-2]);
}
if(col+2 < thePad[0].length && row-1 >= 0)
{
if(thePad[row-1][col+2].getNumber().equals("*") == false &&
thePad[row-1][col+2].getNumber().equals("#") == false)
found.add(thePad[row-1][col+2]);
}
if(col+2 < thePad[0].length && row+1 < thePad.length)
{
if(thePad[row+1][col+2].getNumber().equals("*") == false &&
thePad[row+1][col+2].getNumber().equals("#") == false)
found.add(thePad[row+1][col+2]);
}
if(found.size() > 0)
{
this.moves.put(from, found);
this.movesFrom[from.getNumberAsNumber()] = found.size();
}
else
{
this.moves.put(from, null);
this.movesFrom[from.getNumberAsNumber()] = 0;
}
}
return this.moves.get(from);
}
@Override
public Integer countAllowedMoves(PadNumber from)
{
int start = from.getNumberAsNumber();
if(movesFrom[start] != -1)
return movesFrom[start];
else
{
movesFrom[start] = allowedMoves(from).size();
}
return movesFrom[start];
}
@Override
public String toString()
{
return this.name;
}
}
PhoneChess参赛者类
package PhoneChess;
public final class PhoneChess
{
private ChessPiece thePiece = null;
private PieceFactory factory = null;
public ChessPiece ThePiece()
{
return this.thePiece;
}
public PhoneChess(PadNumber[][] thePad, String piece)
{
if(thePad == null || thePad.length == 0 || thePad[0].length == 0)
throw new IllegalArgumentException("Invalid pad");
if(piece == null)
throw new IllegalArgumentException("Invalid chess piece");
this.factory = new PieceFactory();
this.thePiece = this.factory.getPiece(piece, thePad);
}
public Integer findPossibleDigits(PadNumber start, Integer digits)
{
if(digits <= 0)
throw new IllegalArgumentException("Digits cannot be less than or equal to zero");
return thePiece.findNumbers(start, digits);
}
public boolean isValidMove(PadNumber from, PadNumber to)
{
return this.thePiece.canMove(from, to);
}
}
驱动程序代码:
public static void main(String[] args) {
PadNumber[][] thePad = new PadNumber[4][3];
thePad[0][0] = new PadNumber("1", new Point(0,0));
thePad[0][1] = new PadNumber("2", new Point(1,0));
thePad[0][2] = new PadNumber("3",new Point(2,0));
thePad[1][0] = new PadNumber("4",new Point(0,1));
thePad[1][1] = new PadNumber("5",new Point(1,1));
thePad[1][2] = new PadNumber("6", new Point(2,1));
thePad[2][0] = new PadNumber("7", new Point(0,2));
thePad[2][1] = new PadNumber("8", new Point(1,2));
thePad[2][2] = new PadNumber("9", new Point(2,2));
thePad[3][0] = new PadNumber("*", new Point(0,3));
thePad[3][1] = new PadNumber("0", new Point(1,3));
thePad[3][2] = new PadNumber("#", new Point(2,3));
PhoneChess phoneChess = new PhoneChess(thePad, "Knight");
System.out.println(phoneChess.findPossibleDigits(thePad[0][1],4));
}
}