Comparable interface question

[Fedry Kemilau]

class Cat implements Comparable
{
public int size;

public int compareTo(Object o)
{
int sizeToCompare = 0;
if (o instanceof Cat)
sizeToCompare = ((Cat) o).size;

return size.compareTo(sizeToCompare);    //line #1
}
}

Compiler says that "int cannot be dereferenced". Anyone can help me to explain this?

Thank you.
[ August 10, 2007: Message edited by: fedry kemilau ]

[Srinivasan thoyyeti]

Hey,

Java is not pure object oriented;
behold there are primitive types(int,char,long..etc).

But every primitive can be represented as an Object using wrapper classes.
like , (Integer,Long..).

Though 1.5 JDK uses Autoboxing, It's recommended to write readable code. like this

Integer size = 3;
public void compareTo(Object){

---
---
return size.compareTo(_ _ _ _ );
}
[ August 11, 2007: Message edited by: Srinivasan thoyyeti ]

[Deepak Jain]

At line #1 you attempt to invoke compareTo() using primitive variable size which as you know is incorrect. Methods must be invoked using object refrence variables if they are instance methods or using class names if they are static methods.
return size.compareTo(sizeToCompare)
Thanks
Deepak

[Manfred Klug]

Originally posted by fedry kemilau:
Compiler says that "int cannot be dereferenced"

int is a primitive type, and as such it has no methods.

[Fedry Kemilau]

owh ic, my bad. I did not realize the argument types.
thank you all.
Seems like I have to download java APIs