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/*************************************************************************
* Compilation: javac BoggleBoard.java
* Execution: java BoggleBoard
* Dependencies: StdRandom.java In.java StdOut.java
*
* A data type for Boggle boards.
*
*************************************************************************/
public class BoggleBoard {
private final int M; // number of rows
private final int N; // number of columns
private char[][] board; // the M-by-N array of characters
// the 16 Boggle dice (1992 version)
private static final String[] boggle1992 = {
"LRYTTE", "VTHRWE", "EGHWNE", "SEOTIS",
"ANAEEG", "IDSYTT", "OATTOW", "MTOICU",
"AFPKFS", "XLDERI", "HCPOAS", "ENSIEU",
"YLDEVR", "ZNRNHL", "NMIQHU", "OBBAOJ"
};
// the 16 Boggle dice (1983 version)
private static final String[] boggle1983 = {
"AACIOT", "ABILTY", "ABJMOQ", "ACDEMP",
"ACELRS", "ADENVZ", "AHMORS", "BIFORX",
"DENOSW", "DKNOTU", "EEFHIY", "EGINTV",
"EGKLUY", "EHINPS", "ELPSTU", "GILRUW",
};
// the 25 Boggle Master / Boggle Deluxe dice
private static final String[] boggleMaster = {
"AAAFRS", "AAEEEE", "AAFIRS", "ADENNN", "AEEEEM",
"AEEGMU", "AEGMNN", "AFIRSY", "BJKQXZ", "CCNSTW",
"CEIILT", "CEILPT", "CEIPST", "DDLNOR", "DHHLOR",
"DHHNOT", "DHLNOR", "EIIITT", "EMOTTT", "ENSSSU",
"FIPRSY", "GORRVW", "HIPRRY", "NOOTUW", "OOOTTU"
};
// the 25 Big Boggle dice
private static final String[] boggleBig = {
"AAAFRS", "AAEEEE", "AAFIRS", "ADENNN", "AEEEEM",
"AEEGMU", "AEGMNN", "AFIRSY", "BJKQXZ", "CCENST",
"CEIILT", "CEILPT", "CEIPST", "DDHNOT", "DHHLOR",
"DHLNOR", "DHLNOR", "EIIITT", "EMOTTT", "ENSSSU",
"FIPRSY", "GORRVW", "IPRRRY", "NOOTUW", "OOOTTU"
};
// letters and frequencies of letters in the English alphabet
private static final String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static final double[] frequencies = {
0.08167, 0.01492, 0.02782, 0.04253, 0.12703, 0.02228,
0.02015, 0.06094, 0.06966, 0.00153, 0.00772, 0.04025,
0.02406, 0.06749, 0.07507, 0.01929, 0.00095, 0.05987,
0.06327, 0.09056, 0.02758, 0.00978, 0.02360, 0.00150,
0.01974, 0.00074
};
/**
* Initializes a random 4-by-4 board, by rolling the Hasbro dice.
*/
public BoggleBoard() {
M = 4;
N = 4;
StdRandom.shuffle(boggle1992);
board = new char[M][N];
for (int i = 0; i < M; i++) {
for (int j = 0; j < N; j++) {
String letters = boggle1992[N*i+j];
int r = StdRandom.uniform(letters.length());
board[i][j] = letters.charAt(r);
}
}
}
/**
* Initializes a board from the given filename.
* @param filename the name of the file containing the Boggle board
*/
public BoggleBoard(String filename) {
In in = new In(filename);
M = in.readInt();
N = in.readInt();
board = new char[M][N];
for (int i = 0; i < M; i++) {
for (int j = 0; j < N; j++) {
String letter = in.readString().toUpperCase();
if (letter.equals("QU"))
board[i][j] = 'Q';
else if (letter.length() != 1)
throw new IllegalArgumentException("invalid character: " + letter);
else if (alphabet.indexOf(letter) == -1)
throw new IllegalArgumentException("invalid character: " + letter);
else
board[i][j] = letter.charAt(0);
}
}
}
/**
* Initializes a random M-by-N board, according to the frequency
* of letters in the English language.
* @param M the number of rows
* @param N the number of columns
*/
public BoggleBoard(int M, int N) {
this.M = M;
this.N = N;
board = new char[M][N];
for (int i = 0; i < M; i++) {
for (int j = 0; j < N; j++) {
int r = StdRandom.discrete(frequencies);
board[i][j] = alphabet.charAt(r);
}
}
}
/**
* Initializes a board from the given 2d character array,
* with 'Q' representing the two-letter sequence "Qu".
* @param a the 2d character array
*/
public BoggleBoard(char[][] a) {
this.M = a.length;
this.N = a[0].length;
board = new char[M][N];
for (int i = 0; i < M; i++) {
if (a[i].length != N)
throw new IllegalArgumentException("char[][] array is ragged");
for (int j = 0; j < N; j++) {
if (alphabet.indexOf(a[i][j]) == -1)
throw new IllegalArgumentException("invalid character: " + a[i][j]);
board[i][j] = a[i][j];
}
}
}
/**
* Returns the number of rows.
* @return number of rows
*/
public int rows() { return M; }
/**
* Returns the number of columns.
* @return number of columns
*/
public int cols() { return N; }
/**
* Returns the letter in row i and column j,
* with 'Q' representing the two-letter sequence "Qu".
* @param i the row
* @param j the column
* @return the letter in row i and column j
* with 'Q' representing the two-letter sequence "Qu".
*/
public char getLetter(int i, int j) {
return board[i][j];
}
/**
* Returns a string representation of the board, replacing 'Q' with "Qu".
* @return a string representation of the board, replacing 'Q' with "Qu"
*/
public String toString() {
StringBuilder sb = new StringBuilder(M + " " + N + "\n");
for (int i = 0; i < M; i++) {
for (int j = 0; j < N; j++) {
sb.append(board[i][j]);
if (board[i][j] == 'Q') sb.append("u ");
else sb.append(" ");
}
sb.append("\n");
}
return sb.toString().trim();
}
/**
* Unit tests the BoggleBoard data type.
*/
public static void main(String[] args) {
// initialize a 4-by-4 board using Hasbro dice
StdOut.println("Hasbro board:");
BoggleBoard board1 = new BoggleBoard();
StdOut.println(board1);
StdOut.println();
// initialize a 4-by-4 board using letter frequencies in English language
StdOut.println("Random 4-by-4 board:");
BoggleBoard board2 = new BoggleBoard(4, 4);
StdOut.println(board2);
StdOut.println();
// initialize a 4-by-4 board from a 2d char array
StdOut.println("4-by-4 board from 2D character array:");
char[][] a = {
{ 'D', 'O', 'T', 'Y' },
{ 'T', 'R', 'S', 'F' },
{ 'M', 'X', 'M', 'O' },
{ 'Z', 'A', 'B', 'W' }
};
BoggleBoard board3 = new BoggleBoard(a);
StdOut.println(board3);
StdOut.println();
// initialize a 4-by-4 board from a file
String filename = "board-quinquevalencies.txt";
StdOut.println("4-by-4 board from file " + filename + ":");
BoggleBoard board4 = new BoggleBoard(filename);
StdOut.println(board4);
StdOut.println();
}
}
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