java - 摩尔斯电码，从英语到摩尔斯电码

Question

我创建了一个程序，它将输入转换为摩尔斯电码并将其显示为输出。这是我的程序。

我翻译消息的类。

import java.io.File;
import java.io.IOException;
import java.util.Scanner;

public class MorseCode {
 public MorseCode()
    {
    }//end default constructor
    public String[] translateHere(String s)throws IOException
    {
        String compare = s, codedLine = "";  //userInput toUpperCase
        int length = compare.length();  //length of userInput
        String line, file = "morsecode.txt";// variable holding file name and variable for each letter/number
        char code;
        //Constants
        final int MAX = 36;
        //Arrays
        char[] morseLetter = new char[MAX];
        String[] morseCode = new String[MAX];
        String[] newMessage = new String[length];
        //putting user input in a character array;
        char[] userLetters = compare.toCharArray();
        //object creation
        File openFile = new File(file);
        Scanner inFile = new Scanner(openFile);
        int  counter = 0;
        while(inFile.hasNext())
            {
                line = inFile.next();
                code = (char)line.charAt(0);
                //System.out.println(code);
                morseLetter[counter] = code;
                morseCode[counter] = inFile.next();
                counter++;
            }//end nested while loop
        for(int j = 0; j < length; j++)
        {
            for(int k = 0; k < MAX; k++)
            {
                if(userLetters[j] == morseLetter[k])
                {
                    newMessage[j] = morseCode[k];
                }
            }//end nested for loop
        }//end for loop
        return newMessage;
    }//end method that completes translateion
    public String toString(String a, String[] b)
{
   System.out.println("Input: " + a);
   System.out.println("Output:");
   String output = "";
   for(int i = 0; i < b.length; i++)
   {
      output = output + b[i];
   }
   return output;
 }//end toString method
}//end Translate Class

然后这是我测试的地方。

package morse.code;
import javax.swing.JOptionPane;
import java.io.*;
public class MorseCodeTester
{
    public static void main(String[] args)throws IOException
    {
        String userInput;
        final String SENTINEL = "0";//for exiting program when entered
        //object creation
        MorseCode text = new MorseCode();
        //getting user input to be translated
        do
        {
            userInput = JOptionPane.showInputDialog("Please enter what you wish to translte to Morse code (no punctuation).");
            String compare = userInput.toUpperCase();
            String[] codedText = new String[compare.length()];
            codedText = text.translateHere(compare);
            text.toString(userInput, codedText);
        }while(!userInput.equals(SENTINEL));
    }//end main
}//end class

这里一切看起来都很好，但是在我输入输入后，它显示了这个错误。

 Exception in thread "main" java.io.FileNotFoundException: morsecode.txt (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.util.Scanner.<init>(Scanner.java:656)
at morse.code.MorseCode.translateHere(MorseCode.java:30)
at morse.code.MorseCodeTester.main(MorseCodeTester.java:23)

Java 结果:1

Answer 1

如果您阅读 documentation你会知道，当 JVM 找不到文件时，就会抛出这个异常。我怀疑您需要更新 String line, file = "morsecode.txt";// 准确反射(reflect) morsecode.txt 文件的位置。