How to call objects in Java?

Question

I am kind of embarrassed about this, and definitely I am just forgetting something simple.

if this is body.java

public class body{

    public static void main(String args[])
    {
        int i = 0;
     part aPart = new part(i);
     aPart.add();
    }
}

and this is part.java

public class part{

    private int i;
    public int part(int i)
    {
        this.i = i+10;
    }
    public add ()
    {
        i = i++;
        System.out.println(i);
}

Why when i run javac to compile body.java, it says unknown symbol for part?

If you'd like something that will take care of compilation for you, and you want something simpler and lighter than Eclipse, check out drjava.org. — Brendan
– Brendan, Commented Nov 16, 2010 at 18:03
Always define the first character in a Java class in upper case (Body, Part) — CoolBeans
– CoolBeans, Commented Nov 16, 2010 at 18:04

hvgotcodes · Accepted Answer · 2010-11-16 18:03:23Z

4

because part is your constructor (you don't declare the return type as @amir said in his answer). You should do

public part(int i) {...}

as a note, Java convention is to have class names capitalized, so you should change your file to Part.java, your class declaration to "Part", and your constructor too...

EDIT -- @coolbeans answer is correct too -- if your code in the question is correct, you are missing a closing brace.

edited Nov 16, 2010 at 18:03

answered Nov 16, 2010 at 17:58

hvgotcodes

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1 Comment

Blackbinary Over a year ago

yes, i noticed the capitalization issue. I'm having the problem in a much bigger program, so i thought it better to try and make this test program to see what i forgot. I found the issue though, after comparing, I was making edits and made one too many!

Greg Mattes · Accepted Answer · 2010-11-16 17:58:57Z

1

javac *.java?

answered Nov 16, 2010 at 17:58

Greg Mattes

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1 Comment

Thorarin Over a year ago

That is the immediate problem... but the part constructor is also wrong

CoolBeans · Accepted Answer · 2010-11-16 18:03:09Z

1

Change your Part class like below:-

public class Part{

    private int i;
    public Part(int i)
    {
        this.i = i+10;
    }
    public void add()
    {
        i = i++;
        System.out.println(i);
    }
}

And call it this way:-

int i = 0;
Part aPart = new Part(i);
aPart.add();

answered Nov 16, 2010 at 18:03

CoolBeans

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1 Comment

Blackbinary Over a year ago

thanks, that helped me find the problem in my bigger program i was editing.

Amir Afghani · Accepted Answer · 2010-11-16 17:59:35Z

0

And to elaborate on what hvgotcodes said, constructors do not have a return type. The constructor of a Java class is not an ordinary method. It's sole purpose is to instantiate an object of the the class which it belongs to.

answered Nov 16, 2010 at 17:59

Amir Afghani

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1 Comment

hvgotcodes Over a year ago

i referenced your answer in my answer, if that is OK with you.

gurbieta · Accepted Answer · 2012-12-20 00:50:54Z

0

You need to declare the constructor

public part(int i) {
   this.i = i;
}

answered Dec 20, 2012 at 0:50

gurbieta

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