二維陣列詞搜索

Question

我正在嘗試使用用戶輸入從文本文件中搜索2D數組，但到目前為止，我要么最終得到單詞不在2D數組中（而是），要么最終說出了用戶輸入的內容在數組中。 例如，單詞red在數組中，但是它輸出的次數是它的多次而不是一次，或者它輸出單詞在數組中的次數是多次。 我輸入的字文件在下面，其中前兩個數字用於2D數組的大小。 有人能給我一些提示我做錯了什么，因為當我被困住時，我需要對此有新的了解。

6   6

d e v o l g
r e d p h k
q c h z j c
p o a a f o
v a m m n l
q t f o x b

我的代碼如下，如果我需要稍微清理一下代碼，請讓我知道，因為我確定有些時候可能會有些難以理解。

import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;

public class WordSearch {

public static void main(String[] args) {

    char[][] puzzle = null;
    puzzle = fill(puzzle);


    // create scanner for user input to take the word for searching

    @SuppressWarnings("resource")
    Scanner in = new Scanner(System.in);
    System.out.print("Enter the word you wish to search for (limit of four characters): ");
    String wordToFind = in.nextLine();
    play(wordToFind, puzzle);
    printPuzzle(puzzle);
}

public static char[][] fill(char[][] puzzle) {

    // file Reading

    boolean flag = true;// boolean flag is used for prompting user if the file location is incorrect
    @SuppressWarnings("resource")
    Scanner in = new Scanner(System.in);
    while (flag) {
        System.out.print("Please input the text file locaiton: ");

        String fileLoc = in.nextLine();

        try {

            File f = new File(fileLoc);
            @SuppressWarnings("resource")
            Scanner fileRead = new Scanner(f);

            int row = fileRead.nextInt();// i
            int col = fileRead.nextInt();// j

            puzzle = new char[row][col];

            for (int i = 0; i < puzzle.length; i++) {
                for (int j = 0; j < puzzle[0].length; j++) {
                    puzzle[i][j] = fileRead.next().charAt(0);

                }
            }

            flag = false;// breaks the loop so the user isn't re-prompt for
                            // file location
        } catch (FileNotFoundException e) {

        }

    }
    return puzzle;
}

public static void printPuzzle(char[][] puzzle) {
    for (int i = 0; i < puzzle.length; i++) {
        for (int j = 0; j < puzzle[0].length; j++) {
            System.out.print(puzzle[i][j] + " ");
        }
        System.out.println();
    }
}

public static void play(String word, char[][] puzzle) {
    for (int i = 0; i < puzzle.length; i++) {
        for (int j = 0; j < puzzle[0].length; j++) {

            if (checkUp(puzzle, word, i, j) == true) 
            {
                System.out.println("The word " + word + " was found by the method checkUp beginnning in cell ");


            }
             if ( checkDown(puzzle, word, i, j) == true)
            {
                System.out.println("The word " + word + " was found by the method checkDown beginning in cell");

            }
             if(checkRight(puzzle, word, i, j) == true)
            {
                System.out.println("The word " + word + " was found by the method checkDown beginning in cell");

            }
             if(checkLeft(puzzle, word, i, j) == true)
            {
                System.out.println("The word " + word + " was found by the method checkLeft beginning in cell");

            }

            if(checkUp(puzzle, word, i, j) != true && checkDown(puzzle, word, i, j) != true && checkRight(puzzle, word, i, j) != true && checkLeft(puzzle, word, i, j) != true) 
            {
                System.out.println("The word " + word + " was not in the puzzle");
                break;

            }


        }
    }
}
/**
 * searches for the user defined word going up
 * @param puzzle
 * @param word
 * @param i
 * @param j
 * @return
 */
public static boolean checkUp(char[][] puzzle, String word, int i, int j) {
    char search = word.charAt(0);
    for ( i = 0; i < puzzle.length; i++) {
        for ( j = 0; j < puzzle[0].length; j++) {
            if (search != puzzle[i][j]) {
                return false;

            }

            else {
                i = i - 1;
                if (i < 0) {
                    return false;
                }
            }
        }

    }
    return true;
}



/**
 * searches for the user defined word going down
 * @param puzzle
 * @param word
 * @param i
 * @param j
 * @return
 */
public static boolean checkDown(char[][] puzzle, String word, int i, int j) {
    char search = word.charAt(0);
    for ( i = 0; i < puzzle.length; i++) {
        for ( j = 0; j < puzzle[0].length; j++) {
            if (search != puzzle[i][j]) {
                return false;

            }

            else {
                i = i + 1;
                if (i < 0) {
                    return false;
                }
            }
        }

    }
    return true;
}

/**
 * searches for the user defined word going left
 * @param puzzle
 * @param word
 * @param i
 * @param j
 * @return
 */
public static boolean checkLeft(char[][] puzzle, String word, int i, int j) {
    char search = word.charAt(0);
    for ( i = 0; i < puzzle.length; i++) {
        for ( j = 0; j < puzzle[0].length; j++) {
            if (search != puzzle[i][j]) {
                return false;

            }

            else {
                j = j - 1;
                if (j < 0) {
                    return false;
                }
            }
        }

    }
    return true;
}

/**
 * this method will return true if the user defined word is found going right
 * @param puzzle
 * @param word
 * @param i
 * @param j
 * @return 
 */
public static boolean checkRight(char[][] puzzle, String word, int i, int j) {
    char search = word.charAt(0);
    for ( i = 0; i < puzzle.length; i++) {
        for ( j = 0; j < puzzle[0].length; j++) {
            if (search != puzzle[i][j]) {
                return false;

            }

            else {
                j = j + 1;
                if (j < 0) {
                    return false;
                }
            }
        }

    }
    return true;
}

}

Answer 1

return; if語句中的語句，以便在找到匹配項后不會繼續進行迭代。 您可以顯示在循環完成后找不到它。

public static void play(String word, char[][] puzzle) {
    String foundMessage = "The word %s was found by the method %s beginnning in cell%n";
    for (int i = 0; i < puzzle.length; i++) {
        for (int j = 0; j < puzzle[0].length; j++) {
            if (checkUp(puzzle, word, i, j)) {
                System.out.printf(foundMessage, word, "checkUp");
                return;
            } else if (checkDown(puzzle, word, i, j)) {
                System.out.printf(foundMessage, word, "checkDown");
                return;
            } else if (checkRight(puzzle, word, i, j)) {
                System.out.printf(foundMessage, word, "checkRight");
                return;
            } else if (checkLeft(puzzle, word, i, j)) {
                System.out.printf(foundMessage, word, "checkLeft");
                return;
            }
        }
    }
    System.out.println("The word " + word + " was not in the puzzle");
}

要檢查單詞是否在2D數組中，您只需要一個循環即可。 例如， checkUp ：

public static boolean checkUp(char[][] puzzle, String word, int i, int j) {
    if (i - word.length() >= 0) {
        for (int offset = 0; offset < word.length(); offset++) {
            if (puzzle[i - offset][j] != word.charAt(offset)) {
                return false;
            }
        }
        return true;
    } else {
        return false;
    }
}