摩尔斯电码应用程序（JAVA Gui）

Question

I am attempting to create a gui application that reads english user input and translates to morse ( http://ascii-table.com/morse-code.php ). I have touched on the basic parts of the program so far. My question is; what is the best way of going about reading morse? should i create a text file to import the morse letters off or should i declare each of them inside the program to translate? Next question is how would i go about doing this? please refer to a tutorial if possible. Thanks for your time.

Answer 1

Since Morse Code is not likely to change, hard-coding the mapping of characters to code strings is a valid option:

private static Map<Character,String> charToCode = new HashMap<Character,String>();
{
    charToCode.put('A', ".-");
    charToCode.put('B', "-...");
    ...
    charToCode.put('Z', "--..");
}

This map lets you convert messages to code one character at a time:

• Make a StringBuilder for the result
• Go through characters of the input one character at a time. You can use charAt(i) for that
• Convert the character to upper case
• Use charToCode.get(upperChar) to look up the code representation of the character
• Append the representation to the StringBuilder ; append a space after it
• Once the loop is over, convert StringBuilder to String , and put it on the label.

Answer 2

You can have two files maintained outside. One having a mapping from Letters to Morse Code, and other from Morse Code to Letters. And then, you can build both the converters by doing a lookup from the corresponding file.

Answer 3

Either you can Read the Input from the User and compare them while Run time to the Predefined characters and Numbers Stored in the Program Or you can Input a File and Read it using FileReader

But Here is the Logic that you are Supposed to Perform for Run Time Comparison

 char[] english = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
             'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 
             'y', 'z', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
             ',', '.', '?' };   //Defining a Character Array of the English Letters numbers and Symbols so that we can compare and convert later 

     String[] morse = { ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", 
                ".---", "-.-", ".-..", "--", "-.", "---", ".---.", "--.-", ".-.",
                "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--..", ".----",
                "..---", "...--", "....-", ".....", "-....", "--...", "---..", "----.",
                "-----", "--..--", ".-.-.-", "..--.." };

System.out.println("-->Enter the Sentence that you want to Transmit Using the Morse Code ");
        System.out.print("->");
        sentence = br.readLine();
        System.out.println("");
        sentence = sentence.toLowerCase(); //Because morse code is defined only for the lower case letters and the numbers and the Symbols will remain the Same
        char[] morsec = sentence.toCharArray();
        for(int i = 0; i < morsec.length;i++)  //The loop will run till i is less than the number of characters in the Sentence because Every Character needs to Be Converted into the Respective Morse Code 
        {//For Every Letter in the User Input Sentence
            for(int j = 0;j<english.length;j++)   //For Every Character in the morsec array we will have to traverse the entire English Array and find the match so that it can be represented 
            {
                if(english[j] == morsec[i])  //If the Character Present in English array is equal to the character present in the Morsec array then Only Execute 
                {//Always remember that the condition in the Inner loop will be the first to be Equated in the If Statement because that will change until the characters match 
                    answer = answer + morse[j] + " ";  //After Every Letter is generated in the Morse Code we will give a Space 
                }  //Since the Letters in the English char and the symbols present in the morse array are at the Same Index 
            }
        }
        System.out.println("-->The Morse Code Translation is:- ");
        System.out.Println(answer);