Trivial Java question

[Chandrashekar Tippur]

All,

I have a trivial Java question.
I want to change the value of one variable on the calling object. How
do I do that in Java.

For example,
I have a Vector "abc" in Class "A" and would like to change this in
class
"B".
In class A, I instantiate B (As in B XX=new B(abc) with abc and down
the line I would like to change the value of abc.

Please let me know if I am not too clear. I will try to reword it. The
code is quite big and I don't want to clutter the message.

Thanks in advance,
Shekar

 

[Roedy Green]

I have a trivial Java question.
I want to change the value of one variable on the calling object. How
do I do that in Java.

We just went through this a couple of days ago. You don't do that in
Java. You return a new value and the caller makes the change.
Alternatively you pass an object, and the callee sets one or more of
its fields. A callee CANNOT change the local variables of its caller.

Local mean LOCAL!!

 

[hiwa]

All,

I have a trivial Java question.
I want to change the value of one variable on the calling object. How
do I do that in Java.

For example,
I have a Vector "abc" in Class "A" and would like to change this in
class
"B".
In class A, I instantiate B (As in B XX=new B(abc) with abc and down
the line I would like to change the value of abc.

Please let me know if I am not too clear. I will try to reword it. The
code is quite big and I don't want to clutter the message.

Thanks in advance,
Shekar

A.java
public class A{
private Vector abc;

public A(){
abc = new Vector();
...
}
...
...
public Vector getAbc(){
return abc;
}
...
...
}

B.java
public class B{
A a;

public B(){
a = new A();
...
}

void useAbc(){
Vector vec = a.getAbc();
...
...
}
...
...
}

 

[Chandrashekar Tippur]

That worked. Thanks a lot.

- Shekar