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Thread: converting words to numbers like a phone. i.e. 1800CALLMEE = 1-800-225-5544

  1. #1
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    Default converting words to numbers like a phone. i.e. 1800CALLMEE = 1-800-225-5544

    Please Help! I can't get this program to run correctly...
    I have 2 questions so far:
    1.) How do i get my program to print each number instead of just the very last number? I was thinking maybe it had something to do with the break;'s. this is the first time i've ever used a switch statement.
    2.) Why do I keep getting a "NullPointerException" error? it says "java.lang.NullPointerException
    at PhoneClientDialog.main(PhoneClientDialog.java:10)"

    Here's my student class code:
    public class Phone
    {
        private String word;
        private String number;
     
        public Phone(String word)
        {
            this.word = word;
            this.setNumber();
        }
     
        private void setNumber()
        {
           //Assign number to empty string to avoid null. 
           this.number = ("");
     
           //Convert characters in word to digits.
           int index = 0;
     
           while (index < this.word.length())
           {   
                   //Places digits in number.
                   switch(this.word.toLowerCase().charAt(index))
                   {
                           //#2
                           case 'a': this.number = "2"; break;
                           case 'b': this.number = "2"; break;
                           case 'c': this.number = "2"; break;
                           //#3
                           case 'd': this.number = "3"; break;
                           case 'e': this.number = "3"; break;
                           case 'f': this.number = "3"; break; 
                           //#4
                           case 'g': this.number = "4"; break;
                           case 'h': this.number = "4"; break;
                           case 'i': this.number = "4"; break;
                           //#5
                           case 'j': this.number = "5"; break;
                           case 'k': this.number = "5"; break;
                           case 'l': this.number = "5"; break;
                           //#6
                           case 'm': this.number = "6"; break;
                           case 'n': this.number = "6"; break;
                           case 'o': this.number = "6"; break;
                           //#7
                           case 'p': this.number = "7"; break;
                           case 'r': this.number = "7"; break;
                           case 's': this.number = "7"; break;
                           //#8
                           case 't': this.number = "8"; break;
                           case 'u': this.number = "8"; break;
                           case 'v': this.number = "8"; break;
                           //#9
                           case 'w': this.number = "9"; break;
                           case 'x': this.number = "9"; break;
                           case 'y': this.number = "9"; break;
                   }
             index++;
           }        
        }
     
        //public method that returns number.
        public String toString()
        {
            return this.number;
        }
     
     
    }

    and here is my parent class code:

    import javax.swing.JOptionPane;
     
    public class PhoneClientDialog
    {
       public static void main(String[] args)
       {
          String input = JOptionPane.showInputDialog(
             "Complete the phone number with a word (quit terminates program): 1-800-");
     
    	  while(!(input.equalsIgnoreCase("quit")))
    	  {
    		  Phone myPhone = new Phone(input);
    		  input = JOptionPane.showInputDialog("The actual phone number is 1-800-" + myPhone + '\n' +
             	"Complete the phone number with a word (quit terminates program): 1-800-");
    	  }
     
          System.exit(0);
       }
    }

    the parent class is the one throwing codes but my professor wrote it and we're not allowed to touch it. i would e-mail him but it's the weekend. :/
    Last edited by helloworld922; November 13th, 2010 at 12:31 AM.


  2. #2
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    Default Re: converting words to numbers like a phone. i.e. 1800CALLMEE = 1-800-225-5544

    Words to numbers.

    Well, entering anything in JOptionPane will be taken as a String.

    To get it to ints,

    int x = Integer.parseInt(StringFromJOptionPane);

    I think I have an idea.

    For every case, call the toString().

    Right now, it'll just do it for the last number due to your while loop.

    If you want it every time:

    while (index < this.word.length())
           {  
                   //Places digits in number.
                   switch(this.word.toLowerCase().charAt(index))
                   {
                           //#2
                           case 'a': this.number = "2"; 
    this.toString();
    break;
                           case 'b': this.number = "2"; 
    this.toString();
    break;
    // you get the idea
     
    // if you want to print out to, just call prinltln(toString())
     
    }

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    Laken (November 14th, 2010)

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    Default Re: converting words to numbers like a phone. i.e. 1800CALLMEE = 1-800-225-5544

    Okay, I'll take a crack at the first part of your question.

    If it seems to be only displaying the very last character, I think that would be because each time you run through your for loop, you are over-writing the previous entry by saying
    this.number = "#";

    What if you tried this instead:
    this.number += "#";
    or, if you prefer
    this.number = this.number + "#";

    Hope this helps.

  5. The Following 2 Users Say Thank You to mystikaljester For This Useful Post:

    javapenguin (November 14th, 2010), Laken (November 14th, 2010)

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    Default Re: converting words to numbers like a phone. i.e. 1800CALLMEE = 1-800-225-5544

    Quote Originally Posted by mystikaljester View Post
    Okay, I'll take a crack at the first part of your question.

    If it seems to be only displaying the very last character, I think that would be because each time you run through your for loop, you are over-writing the previous entry by saying
    this.number = "#";

    What if you tried this instead:
    this.number += "#";
    or, if you prefer
    this.number = this.number + "#";

    Hope this helps.
    That worked! Yay! Thank you so much! You're the bomb!

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    Default Re: converting words to numbers like a phone. i.e. 1800CALLMEE = 1-800-225-5544

    My evaluate method in OperatorNode is having a problem. Data is being updated. Sorry for losing my patience, but I do have a rapidly approaching deadline.

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