WordSearch.java

import java.util.*;
import java.io.*;

public class WordSearch {

    private char[][] board;
    private Random rand;
    private ArrayList<String> wordList = new ArrayList<String>();;

 

    public WordSearch(int rows, int cols) {
	rand = new Random();
	board = new char[rows][cols];
	for (int i=0;i<rows;i++) {
	    for (int j=0;j<cols;j++) {
		board[i][j]='-';
	    }
	}
	readWords("Words");
	placeWords(10);
	fillInBlanks();
	System.out.println(toString());
    }


    public WordSearch() {
	this(20,20);
    }


   private void readWords(String filename) {
	try {
	    Scanner sc = new Scanner(new File(filename));
	    while (sc.hasNext()) {
		String s =sc.nextLine();
		wordList.add(s);
	    }
	} catch (FileNotFoundException e) {
	    // if we can't open the file we
	    // exit the program
	    System.out.println(e);
	    System.exit(0);
	}
    }

    
    public void placeWords(int amount) {
	ArrayList <String> words = new ArrayList <String>();
	while (words.size() < amount) {
	    int a = rand.nextInt(wordList.size());
	    int tries = 5;
	    while (tries > 0) {
		if (addWordRandomLoc(wordList.get(a))) {
		    tries = 0;
		    words.add(wordList.get(a));
		    wordList.remove(a);
		}
	    }
	}
	System.out.println(words);
    }
	    
  
	
 public boolean addWord(int row, int col, int deltaR, int deltaC,  String word) {
	if (deltaR < -1 || deltaR > 1 || deltaC < -1 || deltaC > 1 || (deltaR==0 && deltaC==0) )
	    return false;
	int r = row;
	int c = col;
	for (int i=0; i < word.length(); i++) {
		try {
		    if ( board[r][c] != '-' && board[r][c]!=word.charAt(i)) {
			return false;
		    }
		} catch (ArrayIndexOutOfBoundsException e) { 
		    return false; 
		}
		r = r + deltaR; 
		c = c+ deltaC;
	    }
	r = row;
	c = col;
	for (int i=0; i < word.length(); i++) {
	    board[r][c]=word.charAt(i);
	    r = r + deltaR; 
	    c = c+ deltaC;
	}	
	return true;
    }


    
    public boolean addWordRandomLoc(String w) {
	int r = rand.nextInt(board.length);
	int c = rand.nextInt(board[0].length);
	int deltaR = rand.nextInt(3)-1;
	int deltaC = rand.nextInt(3)-1;
	return addWord(r,c,deltaR,deltaC,w);

    }

    public void fillInBlanks() {
	for (int r = 0; r < board.length; r++)
	    for (int c=0;c<board[0].length;c++) {
		if (board[r][c]=='-')
		    board[r][c]=(char)('a'+(char)rand.nextInt('z'-'a'));
	    }
    }


    public String toString() {
	String s = "";
	for (int i=0;i<board.length;i++) {
	    for (int j=0;j<board[i].length;j++) {
		s=s+board[i][j];
	    }
	    s=s+"\n";
	}
	return s;
    }
}