Java Compiler

[Finner Jones]

Hi,

Consider these two classes, ClassA and ClassB. ClassA has a reference to ClassB.

// file sourcename : ClassA.java
public class ClassA {
   public static void main(String[] args) {
      ClassB classb = new ClassB();
   }
}
 
// file sourcename : ClassB.java
public class ClassB {
   public ClassB() {
   }
}
 

According to a book I am reading when I compile ClassA.java with javac ClassA.java, the Java compiler will compile ClassB.java as well automatically because ClassA has a reference to it.
I have tried this and it doesn't seem to be the case.

Can anyone confirm this ?

Cheers
Finner

[Balaji Sampath]

Jones,
I try to detail the above code below and let me know if at any chance it clarified.

public class ClassB {
  public ClassB(){
   System.out.println("In the constructor ClassB()");   
  }
public static void main(String[] args) {
}
} 

Then under the same package have class A:

public class ClassA {
public static void main(String[] args) {
ClassB b= new ClassB();
}
}

Now when u try to compile the class A and run it it did print the statement in the default constructor: In the constructor ClassB()

Since the classes marked public can be accesed from anywhere!!

If you try introduce a compile time error in class B and run class A it throws exception.
So im not sure what exactly ur looking in this question.

Thanks
Balaji.S

[joshua antony]

I think what Finner is asking is that the ClassB.class is not created although ClassA has reference to it.
Can somebody please put some light into this concept

[Barry Gaunt]

Sure it works:

H:\>set CLASSPATH=
 
H:\>del ClassB.class
 
H:\>del ClassA.class
 
H:\>javac ClassA.java
 
H:\>dir *.class
 Volume in drive H is G_DMX8
 Volume Serial Number is E2C0-E78E
 
 Directory of H:\
 
23/06/2006  17:09               286 ClassA.class
23/06/2006  17:09               190 ClassB.class

[Finner Jones]

Originally posted by Barry Gaunt:
Sure it works:

H:\>set CLASSPATH=
 
H:\>del ClassB.class
 
H:\>del ClassA.class
 
H:\>javac ClassA.java
 
H:\>dir *.class
 Volume in drive H is G_DMX8
 Volume Serial Number is E2C0-E78E
 
 Directory of H:\
 
23/06/2006  17:09               286 ClassA.class
23/06/2006  17:09               190 ClassB.class

it does work !!!
I had the above classes in a package and was issuing the javac from the wrong folder. D'oh!
Thanks guys !