doubt in chapter 3 k&B book

[cathymala louis]

This is from K&B book. Chapter 3.

Could you please explain how come f1.x==f3.x returns true, because f1.x prints 5 and f3.x prints 6.

  public class Fizz {
int x = 5;
public static void main(String[] args) {
 
final Fizz f1 = new Fizz();
System.out.println("f1.x" + f1.x);
Fizz f2 = new Fizz();
System.out.println("f2.x" + f2.x);
Fizz f3 = FizzSwitch(f1,f2);
System.out.println("f3.x" + f3.x);
System.out.println((f1 == f3) + " " + (f1.x == f3.x));
  }
 
static Fizz FizzSwitch(Fizz x, Fizz y) {
final Fizz z = x;
z.x = 6;
return z;
} 
}  

[Alejandro Galvan]

Hi Cathymala:

Remember that when you are passing objects as arguments, you are passing it by reference, so in the FizzSwitch method, you have the x, and z Fizz variables are refering to the same object, so if you are modifying the values in z or even x, you also are modifying the values in f1. Check this printing the value of f1.x before the f1==f3 statement.

Regards,

Alejandro Galvan

--------------------

Preparing SCJP

[cathymala louis]

Thank you

[sweta doshi]

Hello ..
Check out this post .It should surely help! ...

Thanks

[sweta doshi]

Hello ..
Check out this post .It should surely help! ...
http://www.coderanch.com/t/266948/java-programmer-SCJP/certification/help


Thanks