how to pass values by reference

[outis]

Is there any way to use parameters by reference in Java, like it is used in C.
I need to call a servlet with several parameters from an JSP, then modify the value of the parameters to return them to the JSP, and I must not use instance variables.

 

[haslo]

You cannot pass primitive data types by reference. But Objects are automatically passed by reference, so you could just use Integers instead of ints.

I don't know though if this works just as well over a network connection - you could just try it out...

allow thyself to be the spark that lights the fire
haslo@haslo.ch - www.haslo.ch​

 

[meadandale]

The only problem with haslo's suggestion is that Integers are immutable so you would not be able to change it via the reference.

Charles

 

[haslo]

Yes, meadandale, you're right - outis, you'll have to write your own wrapper class for the int. Sorry...

public class IntWrapper
{
private int value;

public IntWrapper(int value) { setValue(value); }
public void setValue(int value) { this.value = value; }
public int getValue() { return this.value; }
}

allow thyself to be the spark that lights the fire
haslo@haslo.ch - www.haslo.ch​