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How to create sublass ?

post #1 of 14
10/21/12 at 9:04am
Thread Starter 
How to create a subclass in NetBean IDE 7.2 ?
I have done this >>>


public class C {
private int m;
private int n;
public C(int mIn , int nIn){
m=mIn;
n=nIn;
}
public int m1(){
return m+n;

}


I need to create a subclass to OVERRIDES methods m1 so that its return the difference between m and n instead of sum !
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post #2 of 14
10/21/12 at 9:13am
just create another class and make it inherit from class C and then override it.


offtopic.gif
and please for the love of god PEOPLE stop naming classes and variables like this (C, x, y, r, f, n). for the love of god name the class to what it actually does.

name classes like Car, Enemy, Bullet, Math, Physics. and functions like ConvertRadius, CalculateAngle, PrintString, KillObjectiveC.

sorry, that's my rant for today.
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post #3 of 14
10/21/12 at 7:44pm
Lol @ KillObjectiveC
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post #4 of 14
10/22/12 at 2:51am
Thread Starter 
Quote:
Originally Posted by Fantasy View Post

just create another class and make it inherit from class C and then override it.
offtopic.gif
and please for the love of god PEOPLE stop naming classes and variables like this (C, x, y, r, f, n). for the love of god name the class to what it actually does.
name classes like Car, Enemy, Bullet, Math, Physics. and functions like ConvertRadius, CalculateAngle, PrintString, KillObjectiveC.
sorry, that's my rant for today.
Sorry , the question asked to name like this . LOL .
err , i wrote public class B extends C , but its show me syntax error .
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post #5 of 14
10/22/12 at 3:06am
Quote:
Originally Posted by Yeong View Post

Sorry , the question asked to name like this

Tell your teacher that it is wrong to teach bad habits. It is much easier to understand object-oriented concepts when you think in terms of real world objects (eg. Car and Truck extend Vehicle) rather than meaningless letters. There is absolutely no reason to make the code so abstract that it can't be understood.
Quote:
Originally Posted by Yeong View Post

err , i wrote public class B extends C , but its show me syntax error .

Post all of the code and the full error message. It's hard enough to understand what B and C are meant to be without having to imagine what C might contain. Also, a syntax error can be caused by hundreds of things, so just saying that you've got one doesn't let us help you, especially when we can't see the syntax causing the error. thumb.gif

Oh, and post the code inside [ code ][ /code ] tags so that the formatting is maintained.
Edited by randomizer - 10/22/12 at 3:08am
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post #6 of 14
10/22/12 at 3:18am
Thread Starter 

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post #7 of 14
10/22/12 at 5:31am
Quote:
Originally Posted by qhduong92 View Post

Lol @ KillObjectiveC

biggrin.gif

Quote:
Originally Posted by Yeong View Post



You can't inherit from a class that has arguments in the constructor . You need to have an empty constructor to overload the other constructor that has arguments.

so do this
Code:
public class C 
{
    private int m;
    private int n;
    
//Empty constructor so we can inherit from this class
    public C()
    {
        

    }

    public C(int mIn , int nIn)
    {
        m=mIn;
        n=nIn;
    }
    
    public int m1()
    {
        return m+n;
    }
}

Code:
public class B extends C{

}

good luck thumb.gif
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post #8 of 14
10/22/12 at 9:15am
Thread Starter 
Quote:
Originally Posted by Fantasy View Post

biggrin.gif
You can't inherit from a class that has arguments in the constructor . You need to have an empty constructor to overload the other constructor that has arguments.
so do this
Code:
public class C 
{
    private int m;
    private int n;
    
//Empty constructor so we can inherit from this class
    public C()
    {
        
    }
    public C(int mIn , int nIn)
    {
        m=mIn;
        n=nIn;
    }
    
    public int m1()
    {
        return m+n;
    }
}
Code:
public class B extends C{
}
good luck thumb.gif
thank you so much ! i appreciate it !
Did you know how to overrides method ?
the words "get" cant use
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post #9 of 14
10/22/12 at 9:52am
Quote:
Originally Posted by Yeong View Post

thank you so much ! i appreciate it !
Did you know how to overrides method ?
the words "get" cant use
Code:
public class B extends C{
    
    @Override
    public int m1()
    {
       //New code in here
        return 0;
    }
}
Quote:
Originally Posted by Yeong View Post

the words "get" cant use

mmm what ?!
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post #10 of 14
10/22/12 at 12:44pm
Couldn't he also do it like this?
Code:
public class C 
{
    protected int m;
    protected int n;
    
    public C(int mIn , int nIn)
    {
        m=mIn;
        n=nIn;
    }
    
    public int m1()
    {
        return m+n;
    }
}
Code:
public class B extends C{

    public B(int mIn, int nIn) {
        super(mIn, nIn);
    }    
    
    @Override
    public int m1()
    {
        return m*n;
    }
}
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