如何打乱从文本文件中随机挑选的单词

Question

我正在尝试编写一个程序，该程序从文本文件中选择一个随机单词，对其进行加扰，并允许用户通过一次交换 2 个索引位置来解扰它。

我的程序可以从文本文件中抓取一个随机单词并将其与上面的索引号一起打印出来。

我不知道如何：

1. 在屏幕上打印出来之前将单词打乱，然后
2. 如何让用户能够一次循环交换 2 个索引，直到单词被解读。

有没有我可以编写的方法来执行这些操作？

到目前为止，这是我的代码。

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

public class Midterm { // class header

    public static void main(String[] args) { // Method header

        int option = 0;
        Scanner input = new Scanner(System.in);
        int scrambled;
        int counter = 0;
        int index1;
        int index2;     

        String[] words = readArray("words.txt");
        /*
         * Picks a random word from the array built from words.txt file. Prints
         * index with word beneath it.
         */
        int randWord = (int) (Math.random() * 11);

        for (int j = 0; j < words[randWord].length(); j = j + 1) {
            System.out.print(j);
        }

        System.out.print("\n");     
        char[] charArray = words[randWord].toCharArray();
        for (char c : charArray) {          
            System.out.print(c);
        }
        /*
         * Prompt the user for input to play game or quit.
         */
        System.out.println("\n");
        System.out.println("Enter 1 to swap a par of letters.");
        System.out.println("Enter 2 to show the solution and quit.");
        System.out.println("Enter 3 to quit.");     

        if (input.hasNextInt()) {
            option = input.nextInt();
            counter++;          
        }
        else {
            option = 3;
        }
        System.out.println("");

        if (option == 1) {
            System.out.println("Enter the two index locations to swap separated by a space. ");
            index1 = 0;
            index2 = 0;
            if (input.hasNextInt()) {
                index1 = input.nextInt();
                }
            else {
                System.out.println("Please enter only numbers.");
            }

            if (input.hasNextInt()) {
                index2 = input.nextInt();
                }
            else {
                System.out.println("Please enter only numbers.");
            }
        } 
        }   



    // end main

    public static String[] readArray(String file) {
        // Step 1:
        // Count how many lines are in the file
        // Step 2:
        // Create the array and copy the elements into it

        // Step 1:
        int ctr = 0;
        try {
            Scanner s1 = new Scanner(new File(file));
            while (s1.hasNextLine()) {
                ctr = ctr + 1;
                s1.nextLine();
            }
            String[] words = new String[ctr];

            // Step 2:
            Scanner s2 = new Scanner(new File(file));
            for (int i = 0; i < ctr; i = i + 1) {
                words[i] = s2.next();

            }
            return words;
        } catch (FileNotFoundException e) {

        }
        return null;

    }
}

Answer 1

我对您的代码做了一些相当大的修改，包括添加一个扰码器方法。该程序几乎是完美的，只是您的文件“words.txt”不能包含重复字母的单词。例如，黄色、绿色和紫色无法正确解读，但白色、灰色、蓝色、橙色或红色可以正常工作。除此之外，该程序运行良好。它选择一个随机词，然后当它被解决时，选择一个不同的词，将最后一个词更改为空，所以它不会再次被选中。这是程序：

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

public class Experiments { // class header

    private static String[] words = readArray("/Users/UserName/Desktop/words.txt"); //change to your location of the file

    public static void main(String[] args) { // Method header
        int option = 0;
        Scanner input = new Scanner(System.in);
        int counter = 0;
        String scrambledWord;
        int index1;
        int index2;     

        Random rand = new Random();
        int randWord = rand.nextInt(words.length);

        for (int j = 0; j < words[randWord].length(); j += 1) {
            System.out.print(j);
        }

        System.out.print("\n");     
        scrambledWord = scrambler(words[randWord]);
        System.out.println(scrambledWord);     

        System.out.println("\n");
        System.out.println("Enter 1 to swap a pair of letters.");
        System.out.println("Enter 2 to show the solution and quit.");
        System.out.println("Enter 3 to quit."); 
        option = input.nextInt();

        if (option == 1) {
            while (!scrambledWord.equals(words[randWord])) {
                index1 = 0;
                index2 = 0;
                boolean validOption = false;
                System.out.println("Enter the two index locations to swap separated by a space.");
                while (!validOption) {
                    if (input.hasNextInt()) {
                        index1 = input.nextInt();
                        index2 = input.nextInt();  
                        validOption = true;
                    }
                    else {
                        System.out.println("Please enter only numbers.");
                        validOption = false;
                        break;
                    }
                }
                String letter1 = scrambledWord.substring(index1, index1+1);
                String letter2 = scrambledWord.substring(index2, index2+1);
                System.out.println("replacing " + letter1 + " with " + letter2 + "...");
                if (index1 < index2) {
                    scrambledWord = scrambledWord.replaceFirst(letter2, letter1);                 
                    scrambledWord = scrambledWord.replaceFirst(letter1, letter2); 
                } else {
                    scrambledWord = scrambledWord.replaceFirst(letter1, letter2);                 
                    scrambledWord = scrambledWord.replaceFirst(letter2, letter1); 
                }
                System.out.println();
                for (int j = 0; j < words[randWord].length(); j += 1) {
                    System.out.print(j);
                }
                System.out.println("\n"+scrambledWord);
                System.out.println();
                counter++;
                if (scrambledWord.equals(words[randWord])){
                    System.out.println("You did it! The word was " + words[randWord]);
                    System.out.println("You got it with " + counter + " replacements!");
                    words[randWord] = null;
                    if (words.length == 0){
                        System.out.println("I'm all out of words. You win!");
                        System.exit(0);
                    } else {
                        main(args);
                    }
                }
            } 

        } else if (option == 2) {
            System.out.println(words[randWord]);
            System.exit(0);
        } else {
            System.exit(0);
        }
        input.close();
   }   

    //scrambles the word given to it
    private static String scrambler(String word) { 
        String scrambled = "";
        Random rand = new Random();
        int length;
        int index;
        String letter;
        String firststring;
        String secondstring;

        while (word.length()>0) {
            length = word.length();
            index = rand.nextInt(length);
            letter = word.substring(index, index+1);
            firststring = word.substring(0, index);
            secondstring = word.substring(index+1);
            word = firststring + secondstring;
            scrambled += letter;
        }
        return scrambled;
    }

    public static String[] readArray(String file) {
        int ctr = 0;
        try {
            Scanner s1 = new Scanner(new File(file));
            while (s1.hasNextLine()) {
                ctr = ctr + 1;
                s1.nextLine();
            }
            String[] words = new String[ctr];

            // Step 2:
            Scanner s2 = new Scanner(new File(file));
            for (int i = 0; i < ctr; i = i + 1) {
                words[i] = s2.next();

            }
            return words;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return null;
        }
}

这是words.txt文件中的单词列表（我几乎写下了脑海中没有重复字母的任何内容）：

orange
red
brown
black
white
blue
tiger
horse
bugs
stack
overflow
pathfinder
extra
zealous
wisdom
under
above
death
life
second
first
frost
forest

这些显然不是唯一可以进入的单词，您可以添加任意数量的单词，只要它们没有出现 2 次相同的字母即可。

Answer 2

您正在错误地读取文件。做

public static String[] readArray(String file) {
    int ctr = 0;
    try {
        Scanner s1 = new Scanner(new File(file));
        while (s1.hasNext()) {
            ctr = ctr + 1;
            s1.next();
        }
        //..rest of code