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Thread: Basic Java Question

  1. #1
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    Default Basic Java Question

    Hi all so I'm very new to Java and am working on a project which requires my program works properly with all name inputs, but I coded it to only output what I need with one.

    What I did was initialize my fullname into first and lastname using substrings, but that obviously won't work for any name because there will be a different number of characters.

    Here's the code :

     
    public class Proj2
    {
        public static void main(String[] args)
        {
     
     
     
    		 String fullname = "dAvId lAwReNt";
           String firstname;
           String lastname;
     
     
           firstname = fullname.substring(0,5);
            lastname = fullname.substring(6,13);
     
    		int count = fullname.length();
     
    		System.out.println("Index of Space:" + fullname.length());
     
           System.out.println("First Name: " + firstname + " has " + firstname.length() + " letters.");
     
    		 System.out.println("Last Name: " + lastname + " has " + lastname.length() + " letters.");
     
     
    		 firstname = firstname.toUpperCase();
    		 lastname = lastname.toUpperCase(); 
     
    			System.out.println("Initial of the first name in uppercase: " + firstname.charAt(0));
     
    			 firstname = firstname.toLowerCase();
     
    			System.out.println("Rest of the first name in lowercase: " + firstname.substring(1));
     
     
    			System.out.println("Initial of the last name in uppercase: " + lastname.charAt(0));
     
    			lastname = lastname.toLowerCase(); 
     
    			System.out.println("Rest of the last name in lowercase: " + lastname.substring(1));
     
     
    			firstname = firstname.toLowerCase();
    		   lastname = lastname.toLowerCase(); 
     
     
    			firstname = firstname.substring(0, 1).toUpperCase() + firstname.substring(1);
    			lastname = lastname.substring(0, 1).toUpperCase() + lastname.substring(1);
     
     
     
    			 System.out.println("My name is " + firstname + " " + lastname);
           }
           }

    I just need to set firstname and lastname without using substrings since that won't work if i were to replace the name with another with a different amount of characters


  2. #2
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    Default Re: Basic Java Question

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for newcomers.

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    Default Re: Basic Java Question

    Quote Originally Posted by GregBrannon View Post
    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for newcomers.
    Thanks! I edited my post.

    -Also, I have figured out I need to use IndexOf but I'm not sure how to implement it.
    Any help is greatly appreciated!

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    Default Re: Basic Java Question

    You might also check out String.split().

    Using indexOf(), If you know the index of the space, then you know how to form the substrings which will resolve your initial concern.

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    Default Re: Basic Java Question

    I'm not allowed to use string.split yet I don't think
    fullname.indexOf(fullname); Would that give me the index of the space?

    I'm still a little foggy on how to initialize it after finding it


    Edit:

    fullname.indexOf(' ') Gives me "5" for index of space.

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    Default Re: Basic Java Question

    Hi,


    For splitting the fullname you can also use stringtokenizer.

    Thanks,

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    Default Re: Basic Java Question

    Quote Originally Posted by Ganeprog View Post
    For splitting the fullname you can also use stringtokenizer.
    A summary from the API docs:
    StringTokenizer is a legacy class...its use is discouraged in new code.

    I'm still a bit foggy as to the goal...are you wishing to get the full name (last and first) as two Strings? Is the full name supposed to be hard-coded, or flexible from the standpoint of accepting the full name from the command line? If you wish to simply 'split' on a space, see (and I recommend play with the methods from) the API of the String, in particular indexOf(), substring(), and (as alluded to earlier) split().

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