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Thread: One string Text message into array of strings(letters)

  1. #1
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    Default One string Text message into array of strings(letters)

    I need to convert a text message from the command line into an array of letters.

    args(0) is a string, for example "The sky is beautiful today". And I want it to become theskyisbeautifultoday

    args(o) could be any sentence

    Eclipse keep showing error for:

    String str = args(0);
    char[] chs = str.toCharArray();


    What could be wrong?


  2. #2
    Senior Member PhHein's Avatar
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    Default Re: One string Text message into array of strings(letters)

    args is an array. if you want to access the first element, i.e. your sentence the syntax is
    String str = args[0];

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    Default Re: One string Text message into array of strings(letters)

    Thanks for your reply
    Actually, args(0) = "The sky is beautiful today"
    So args(0) is one string
    args(0) is set by the user and could be any other text message

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: One string Text message into array of strings(letters)

    Note:
    [] are used with arrays
    () are used with methods and constructors
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: One string Text message into array of strings(letters)

    Yes, sorry.

    So I don't need to convert it to an array.

    I need to change args(0) from "The sky is beautiful today" to theskyisbeautifultoday

    I have tried

    String [] mess = args(0).toLowerCase(args(0));

    but I am not sure it is right and Eclipse keeps returning error.

    Where did I go wrong?

    Thanks

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: One string Text message into array of strings(letters)

    What is args(0)? See post#4

    Eclipse keeps returning error.
    Please copy the full text of the error messages and paste it here.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: One string Text message into array of strings(letters)

    args(0) = "The sky is beautiful today"

    I will encrypt this message later in a Caesar Box.

    The error message is:

    The method args(int) is undefined for the type CaesarBox

    *ps: CaesarBox is the Class name


    I understand this error could happen if I don't set an input, in this case if I don't set args(0), but I did.

    Thanks.

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: One string Text message into array of strings(letters)

    You are still not coding arrays correctly:
    () are used with methods
    [] are used with arrays
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: One string Text message into array of strings(letters)

    args(0) is the input argument set by the user(text message)

    --- Update ---

    Sorry, args[0]

    So it would be

    String [] mess = args[0].toLowerCase(args[0]);

  10. #10
    Super Moderator Norm's Avatar
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    Default Re: One string Text message into array of strings(letters)

    args[0] is a String not an array of String
    Try: String mess = args[0]....
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: One string Text message into array of strings(letters)

    String [] mess = args[1].toLowerCase(args[1]);

    Error:

    args cannot be resolved to a variable

    --- Update ---

    Sorry just saw your reply now.

    --- Update ---

    String mess = args[0].toLowerCase(args[0]);

    The error continues

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    Default Re: One string Text message into array of strings(letters)

    If args cannot be resolved then you did not call your parameter in the main method args. Please post your full code and use code tags
    Improving the world one idiot at a time!

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    Default Re: One string Text message into array of strings(letters)

    public static void main(String[] args) {
    // CaesarsBox <-encrypt|-decrypt>

    if(args[0].equals("-encrypt")){
    System.out.println(encrypt(args[1]));
    }
    else if(args[0].equals("-decrypt")){
    System.out.println(decrypt(args[1]));
    }
    }

    public static String encrypt(String plainText) {


    String mess = args[1].toLowerCase(args[1]);



    }

    public static String decrypt(String cypherText) {

    }

    }




    How to use code tags?

  14. #14
    Super Moderator Norm's Avatar
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    Default Re: One string Text message into array of strings(letters)

    How to use code tags?
    Please edit your post and wrap your code with code tags:
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: One string Text message into array of strings(letters)

    An example is below:

    public class CaesarBox {
     
    	public static void main(String[] args) {
    		// CaesarsBox <-encrypt|-decrypt> 
     
    		if(args[0].equals("-encrypt")){
    			System.out.println(encrypt(args[1]));
    		}
     
    	}
     
    	public static String encrypt(String plainText) {
     
     
    	String s = plainText.toLowerCase();
     
        System.out.println(s);
     
        return s;
     
     
     
     
    	}
     
    }

    The problem now is: why it is not printing s?

  16. #16
    Super Moderator Norm's Avatar
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    Default Re: One string Text message into array of strings(letters)

    What is the value of args[0] when the program is executed?
    If you don't understand my answer, don't ignore it, ask a question.

  17. The Following User Says Thank You to Norm For This Useful Post:

    dianac (April 11th, 2013)

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    Default Re: One string Text message into array of strings(letters)

    Hi Norm
    Thank you
    It was - encrypt but should have been -encrypt, so a blank space was the problem.

    Now I need to take out all the blank spaces of s. Any idea of how could I do that?

  19. #18
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    Default Re: One string Text message into array of strings(letters)

    What is on the command line when the program is executed? If the user entered:
    java CaesarBox - encrypt
    then args[0] woluld be "-" and args[1] would be "encrypt"

    Does the program want to allow that or should it require that the user enter:
    java CaesarBox -encrypt
    with no spaces?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: One string Text message into array of strings(letters)

    only with no spaces. Thanks

  21. #20
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    Default Re: One string Text message into array of strings(letters)

    If the user's input is not right, tell the user what the valid choices are and exit the program.
    If you don't understand my answer, don't ignore it, ask a question.

  22. #21
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    Default Re: One string Text message into array of strings(letters)

    Now it is right. This was solved. Thanks.

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