Java Concepts

This is a discussion on Java Concepts within the Tech Board forums, part of the Community Boards category; Im looking at Java book for CS AP, but i dont get all stuff. Code: public class Test { public ...

  1. #1
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    Java Concepts

    Im looking at Java book for CS AP, but i dont get all stuff.

    Code:
    public class Test {
    	public static void main(String[] args) {
    		System.out.println("test");
    	}
    }
    How can main be inside of something?

    Do all class have to have a main?

    This is alittle funky...

    Thanks

  2. #2
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    Not every class has a main but every main has to be in a class. Object oriented programming is a bit different from procedural languages.
    Wandering aimlessly through C.....

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  3. #3
    Code Goddess Prelude's Avatar
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    Java is a little different than C++. Everything must be a class (or interface), so there's a controlling class that contains the main function as an entry point. Annoyingly, the name of that controlling class is also the name of the source file.
    My best code is written with the delete key.

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    The Defective GRAPE Lurker's Avatar
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    Just so you know, it's supposed to be String args[] now.
    Do not make direct eye contact with me.

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    Code Goddess Prelude's Avatar
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    >Just so you know, it's supposed to be String args[] now.
    You can do it both ways. Your way may be 'preferred' now (if you're correct that is), but to require it would break far too much code. I don't think Sun is willing to risk doing that.
    My best code is written with the delete key.

  6. #6
    The Defective GRAPE Lurker's Avatar
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    Yes, preferred as int main is preferred to void main .
    Do not make direct eye contact with me.

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    C++ Developer XSquared's Avatar
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    Originally posted by Lurker
    Yes, preferred as int main is preferred to void main .
    That's in C/C++, not Java.
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  8. #8
    Even death may die... Dante Shamest's Avatar
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    . Annoyingly, the name of that controlling class is also the name of the source file.
    This is true only if the class is declared public.

    Just so you know, it's supposed to be String args[] now.
    Can you verify your claim? I'm pretty sure Sun has always encouraged String[] args. This style better reflects the fact that args is an array of references to String objects.

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    Back to my original question, how could i keep tract of all those objects?

    If every student gets a object from the class how i can i make a object for every student without knowing their name or how many there are?

    In C it would be a linked list, could some on show me a mock up of a java one please?

  10. #10
    Crazy Fool Perspective's Avatar
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    Originally posted by mart_man00
    Back to my original question, how could i keep tract of all those objects?

    If every student gets a object from the class how i can i make a object for every student without knowing their name or how many there are?

    In C it would be a linked list, could some on show me a mock up of a java one please?
    i assume you are referring to your other java thread?

    Code:
    import java.util.LinkedList;
    .....
    LinkedList list = new LinkedList();
    .....

  11. #11
    Even death may die... Dante Shamest's Avatar
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    Java also has linked lists. The principles are the same. Alternatively you can use the vector class.

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    Alternatively you can use the vector class.
    Should i be looking at that instead? Whats move Java-y?

    i assume you are referring to your other java thread?
    Doh!

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