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Thread: New to Java having problem debugging my code.

  1. #1
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    Default New to Java having problem debugging my code.

    The code is supposed to capitalize the first letter of the word typed and reverse the sentence.

    I believe i messed up here "String firstchar = sentence.substring (lString+1,lSpace+2).toUpperCase();"

    I'm totally new to java and have no clue what could have went wrong :'(

    import java.util.Scanner;
    public class reverseSentence {
    public static void main ( String [] args) {
    String sentence, piece1,piece2;
    int lSpace;
    Scanner input = new Scanner (System.in);
     
    System.out.println ("Enter a sentence no punctuation");
    sentence = input.nextLine();
     
    lSpace = sentence.indexOf("");
    piece1 = sentence.substring(0,lSpace);
    piece2 = sentence.substring(lspace+2);
     
    String firstchar = sentence.substring (lString+1,lSpace+2).toUpperCase();
     
    system.out.println(firstChar + piece2 + " " + piece1);
     
     
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: New to Java having problem debugging my code.

    what could have went wrong
    Can you explain what is wrong?
    Post the program's output and add some comments explaining what is wrong and what the output should be.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: New to Java having problem debugging my code.

    Enter a sentence no punctuation
    hello world
    Ello world
    Its supposed to switch the pieces and capitalize the first letter. The result is supposed to be
    World hello

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: New to Java having problem debugging my code.

    It looks like The current code strips off the first letter and capitalizes the second letter.

    What is the value returned by the indexOf() method? Is that what you want?
    If not, change the way indexOf() is used so it gives you the desired value.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: New to Java having problem debugging my code.

    Is this a complete class? You seem to have not declared lString or firstChar anywhere. I run it on my IDE and it just throws an error due to this.
    Edit: You have declare firstChar but as firstchar. Watch out for this, I'll have a look through

    --- Update ---

    Does this make sense to you?
    import java.util.Scanner;
     
    public class reverseSentence {
     
        public static void main(String[] args) {
            String sentence, piece1, piece2;
            int lSpace;
     
            Scanner input = new Scanner(System.in);
     
            System.out.println("Enter a sentence no punctuation");
            sentence = input.nextLine();
     
            lSpace = sentence.indexOf(" ");
            //Selects the first word from 0 to first space
            piece1 = sentence.substring(0, lSpace);
            //Selects second word from space to string end
            piece2 = sentence.substring(lSpace + 1, sentence.length());
            //reverses the words and stores as ouput
            String output = piece2 + " " + piece1;
            //Get the first char of output as a String
            String firstChar = output.charAt(0) + "";
            //Make it uppercase
            firstChar = firstChar.toUpperCase();
            //Replace the first letter of output with the capitalised firstChar
            output = output.replace(output.charAt(0), firstChar.charAt(0));
            //Print it to console
            System.out.println(output);
        }
    }
    I hope this wasn't homework LOL

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    Default Re: New to Java having problem debugging my code.

    It wasn't homework it was my first day and we were copying the codes down and we had to copy the code.

    Apparently I copied it wrong or the professor wrote it wrong.

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    Default Re: New to Java having problem debugging my code.

    Oh right, yeah I'm currently in my 2nd year studying it, got my main exam in it Friday. Lecturers get code wrong all the time and my 1st year professor was awful at teaching Java, luckily I taught myself LOL. Good luck! its such a simple but powerful language once you get to grips with it. If you need any tips or questions feel free to message me ;-)

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: New to Java having problem debugging my code.

    I hope this wasn't homework LOL
    @rossc Please don't do the OPs work for him.
    See: The Problem with Spoon-feeding

    --- Update ---

    I hope this wasn't homework LOL
    @rossc Please don't do the OPs work for him.
    See: The Problem with Spoon-feeding

    --- Update ---

    I hope this wasn't homework LOL
    @rossc Please don't do the OPs work for him.
    See: The Problem with Spoon-feeding
    If you don't understand my answer, don't ignore it, ask a question.

  9. #9
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    Default Re: New to Java having problem debugging my code.

    Sorry, learnt my lesson

    --- Update ---

    Quote Originally Posted by Norm View Post
    @rossc Please don't do the OPs work for him.
    See: The Problem with Spoon-feeding

    --- Update ---


    @rossc Please don't do the OPs work for him.
    See: The Problem with Spoon-feeding

    --- Update ---


    @rossc Please don't do the OPs work for him.
    See: The Problem with Spoon-feeding
    Sorry, learnt my lesson

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