Question

我正在尝试编写一个程序，该程序将接收来自dictionary.txt文档的输入并将这些单词存储在词典列表中，然后确定该单词是否可以分为三个或更多单词，如果可以，则进行打印原来的单词后面跟着新单词，例如disconsolateness:disc on so lateness将是组成More.txt文件的输出。现在，代码只是继续运行，但是我没有得到任何输出，也不确定自己做错了什么。您能提供的任何帮助将不胜感激。我已经在下面发布了我的代码，输入的内容是字典中的任何单词。

import java.util.*;
import java.io.*;
public class CompositionTwo
{
    private static List<String> dictionary = new ArrayList<>();
    public static void main(String []args) { 
        File inputFile = new File("dictionary.txt");
        File outputFile = new File("composedMore.txt");
        Scanner in = null;
        PrintWriter out = null;

        try {
            in = new Scanner(inputFile);
            out = new PrintWriter(outputFile);
            while (in.hasNext()) {
                String input = in.next();
                dictionary.add(input);
                String output = splitWord(input, "");
                if (output != "") {
                    out.println(input + ":" + output);
                }
            }
        } catch (IOException e) {
            System.out.println("An IOException has occurred during output process.");
        } finally {
            in.close();
            out.close();
        }

    } 

    public static String splitWord(String word, String output) {

        if (word.length() == 0) {
            output = output;
        }
        else {
            for (int i = 1; i <= word.length(); i++) {
                // consider all prefixes of current String
                String prefix = word.substring(0, i);

                // if the prefix is present in the dictionary, add prefix to the
                // output String and recurse for remaining String

                if (dictionary.contains(prefix)) {
                    splitWord(word.substring(i), output + " " + prefix);
                }
            }
        }

        return output;
    }  
}

Answer 1

首先将所有单词添加到字典中，然后再检查每个单词，因为您需要与文件中的所有单词进行比较您采用的过程只是在比较之前先比较单词

import java.util.*;

 import java.io.*;

 public class CompositionTwo
 {

private static List<String> dictionary = new ArrayList<>();
public static void main(String []args) { 
    File inputFile = new File("dictionary.txt");
    File outputFile = new File("composedMore.txt");
    Scanner in = null;
    PrintWriter out = null;
    String word;

    try {
        in = new Scanner(inputFile);
        out = new PrintWriter(outputFile);
        //Read the file indictionary
        while (in.hasNext()) {
            String input = in.next();
            dictionary.add(input);
        }

        //Check All the words in dictionary for Splitting
        for(int i=0;i<dictionary.size();i++)
        {
            String output = splitWord(dictionary.get(i), "");
            if (!"".equals(output)) {
                String outa[] = output.split("\\s") ;
                if(outa.length >= 3) // Check if 3 words are created as output
                {
                System.out.println(dictionary.get(i) + ":" + output);
                out.println(dictionary.get(i) + ":" + output);
                }
            }
        }
    } catch (IOException e) {
        System.out.println(e.getMessage());
    } finally {
        in.close();
        out.close();
    }

} 

public static String splitWord(String word, String output) {

    if (word.length() == 0) {
        return output;
    }
    else {
        for (int i = 1; i <= word.length(); i++) {
            // consider all prefixes of current String
            String prefix = word.substring(0, i);

            // if the prefix is present in the dictionary, add prefix to the
            // output String and recurse for remaining String

            if (dictionary.contains(prefix)) {
                return splitWord(word.substring(i), output + " " + prefix);
            }
        }
    }

    return output ;

}

}

Answer 2

假设您有这本字典：

disc
on
so
lateness

并假设您针对字符串disconsolateness运行程序。我进行了一些更改，首先加载字典，然后调用递归方法splitWord。

您应该知道，递归方法被称为将全部放在堆栈中，然后逐个返回一个调用。因此，我选择将递归调用更改为：

return prefix + " " + splitWord(word.substring(i), output);

以便在每个方法调用之后将找到的每个单词连接起来。

很显然，就像您已经做过的那样，当变量output中没有更多字符时，我的停止条件仍然存在。

    package io.gdfb.questions;

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

    public class CompositionTwo {
        private static List<String> dictionary = new ArrayList<>();

        public static void main(String[] args) {
            loadDictionary();

            File outputFile = new File("composedMore.txt");
            PrintWriter out = null;
            try {
                out = new PrintWriter(outputFile);
                String output = splitWord(args[0], "");
                if (output != "") {
                    out.println(args[0] + ":" + output);
                }
            } catch (IOException e) {
                System.out.println("An IOException has occurred during output process.");
            } finally {
                out.flush();
                out.close();
            }

        }

        private static void loadDictionary() {
            InputStream inputFile = Thread.currentThread().getContextClassLoader().getResourceAsStream("dictionary.txt");
            Scanner in = null;
            try {
                in = new Scanner(inputFile);
                while (in.hasNext()) {
                    String input = in.next();
                    dictionary.add(input);
                }
            } finally {
                in.close();
            }
        }

        public static String splitWord(String word, String output) {
            for (int i = 1; i <= word.length(); i++) {
                // consider all prefixes of current String
                String prefix = word.substring(0, i);
                // if the prefix is present in the dictionary, add prefix to the
                // output String and recurse for remaining String
                if (dictionary.contains(prefix)) {
                    return prefix + " " + splitWord(word.substring(i), output);
                }
            }
            return output;
        }
    }

递归将一个单词分成三个或更多单词java

2 个答案: