Java 填字游戏二维数组

Question

package assignment2;
import java.util.Random;
import java.util.Scanner;

public class test2 {
public static void main(String[] args) {
    int wordAmount = wordAmount();
    String[] words = wordArray(wordAmount);
    displayWords(words, wordAmount);
    char[][] puzzleGrid = generatePuzzleGrid(words, wordAmount);
    //System.out.println(Arrays.deepToString(puzzleGrid)); //just using this to test
    printPuzzleGrid(puzzleGrid, wordAmount);
}

public static int wordAmount(){
    Scanner input = new Scanner(System.in);
    System.out.print("How many words would you like in the word search(5-15): ");
    int wordAmount = input.nextInt();
    while(wordAmount < 5 || wordAmount > 20){
        System.out.println("The number you've requested is either to large or to small.");
        System.out.print("How many words would you like in the word search(5-20): ");
        wordAmount = input.nextInt();
    }
    return wordAmount;
}

public static String[] wordArray(int wordAmount){
    String[] words = new String[wordAmount];
    Scanner input = new Scanner(System.in);
    for(int i = 0; i < wordAmount; i++){
        System.out.print("Enter a word: ");
        words[i] = (input.nextLine().toUpperCase());
        for(int j = 0; j < wordAmount; j++){
            if(j == i) break;
            while(words[i].contains(words[j])){
                System.out.print("The word you entered has already been entered, enter a new word: ");
                words[i] = (input.nextLine().toUpperCase());
            }
        }
        while(words[i].length() > 10 || words[i].length() <= 2 || words[i].contains(" ")){
            System.out.print("The word you entered has been rejected, enter a new word: ");
            words[i] = (input.nextLine().toUpperCase());
        }
    }
    return words;
}

public static void displayWords(String[] words, int wordAmount){
    System.out.print("The words you must find are: ");
    for(int w = 0; w < wordAmount; w++){
        System.out.print(words[w] + "  ");
    }
    System.out.println("");
}

public static char[][] generatePuzzleGrid(String[] words, int wordAmount){
    char[][] puzzleGrid = new char[wordAmount][wordAmount];
    Random rand = new Random();
    for(int across = 0; across < wordAmount; across++){
        for(int down = 0; down < words[across].length(); down++){
            puzzleGrid[across][down] = words[across].charAt(down);
            for(int filler = wordAmount; filler >= words[across].length(); filler--){
                puzzleGrid[across][filler] = (char)(rand.nextInt(26) + 'A'); //this is the line with the problem
            }
        }
    }
    return puzzleGrid;
}

public static void printPuzzleGrid(char[][] puzzleGrid, int wordAmount){
    for(int across = 0; across < wordAmount; across++){
        for(int down = 0; down < wordAmount; down++){
            System.out.print(" " + puzzleGrid[down][across]);
        }
        System.out.println("");
    }
}    
}

看来我的上一个问题已经解决了，但现在我遇到了一个新问题。

错误：线程异常 "main" java.lang.ArrayIndexOutOfBoundsException：5 在作业 2.test2.generatePuzzleGrid(test2.java:63) 在作业 2.test2.main(test2.java:10) C:\Users\Higle\AppData\Local\NetBeans\Cache.2\executor-snippets\run.xml:53: Java 返回：1 构建失败（总时间：9 秒）

Answer 1

您似乎是在对少于 5 个字符的字符串调用 charAt(5)。你可以这样做

if(words[across].length() < (down-1)){ 
    continue;
}

确保你不会得到那个特定的错误......另外，你可能想知道 charAt() returns char 的索引从 0->length()-1

Answer 2

它接缝应用程序运行没有任何问题，唯一关心的是如果用户提供的 wordAmount（网格中的字符数）大于他提供的单词会发生什么。所以最好在 wordAmount 上添加验证，如下所示。

public static char[][] generatePuzzleGrid(String[] words, int wordAmount) {
    if(wordAmount>words.length){
        wordAmount = words.length;
    }
    char[][] puzzleGrid = new char[wordAmount][wordAmount];
    for (int across = 0; across < wordAmount; across++) {
        for (int down = 0; down < words[across].length(); down++) {
            puzzleGrid[across][down] = words[across].charAt(down);/////////////////
        }
    }
    return puzzleGrid;
}

Java 填字游戏二维数组

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runtimeexception