WordSearch.java

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

public class WordSearch {

    private char[][] board;
    private Random rand;
    private ArrayList<String> wordList;
    private ArrayList<String> words;
    
    private void readWords(String filename) {
	wordList = new ArrayList<String>();
	try {
	    Scanner sc = new Scanner(new File(filename));
	    while (sc.hasNext()) {
		String s =sc.nextLine();
		wordList.add(s.toUpperCase());
	    }
	} catch (FileNotFoundException e) {
	    // if we can't open the file we
	    // exit the program
	    System.out.println(e);
	    System.exit(0);
	}
    }


  
    public void setWords(int numWords){
	words = new ArrayList<String>();
	for (int i=0; i<numWords; i++){
	    int n = rand.nextInt(wordList.size());
	    String s = wordList.get(n);
	    boolean added = false;
	    while(!added){
		n = rand.nextInt(wordList.size());
		s = wordList.get(n);
		added = false;
		for (int x=0; x<30; x++){
		    if(addWordRandomLoc(s)){
			words.add(s);
			wordList.remove(n);
			added = true;
			break;
		    }
		}
	    }

	}
    }

    public ArrayList getWords(){
	return words;
    }

    public WordSearch(int rows, int cols) {
	rand = new Random();
	readWords("words");
	//System.out.println(wordList);
	board = new char[rows][cols];
	for (int i=0;i<rows;i++) 
	    for (int j=0;j<cols;j++) 
		board[i][j]='-';

    }

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

    public boolean addWord(int row, int col, int deltaR, int deltaC,  String word) {

	/* make sure deltas are in range */
	if (deltaR < -1 || deltaR > 1 || deltaC < -1 || deltaC > 1 || 
	    (deltaR==0 && deltaC==0) )
	    return false;

	/* see if we can place the word */
	int r = row;
	int c = col;
	for (int i=0; i < word.length(); i++) {
		try {
		    //j=10/i; <-- this is only to show the Arithmetic exception
		    if ( board[r][c] != '-' && board[r][c]!=word.charAt(i)) {
			return false; // we return false since we can't add the word
		    }
		} catch (ArrayIndexOutOfBoundsException e) { // Handle the array one
		    return false;  // we return false since we can't add the word
		}
		r = r + deltaR; 
		c = c+ deltaC;
	    }
    	
	/* if we get here, we can add the word */
	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 addWordH(int r, int c, String w) {
	return addWord(r,c,0,-1,w);
    }
    public boolean addWordV(int r, int c, String w) {
	return addWord(r,c,1,0,w);
    }
    public boolean addWordD(int r, int c, String w) {
	return addWord(r,c,1,1,w);
    }
    
    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;
    }


}