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Message:

Swapping of two Object Variables.

Posted by Mohamed Ibrhaim on December 12, 2001 at 5:23 AM

Hi,
Ofcourse the code does work fine. But explain me the difference between following two different programs. One uses pass by reference and other pass by value.. Why this contradiction? In both i use string objects..

1.
class Test
{
public void swap(String x, String y)
{
String temp = x;
x=y;
y=temp;
}
public static void main(String args[])
{
String xx = new String("Mohamed");
String yy = new String("Ibrahim");
Test t0= new Test();
System.out.println("The value of x and y before swap are "+xx+", "+yy);
t0.swap(xx,yy);
System.out.println("The value of x and y after swap are "+xx+", "+yy);
}
}

2.

class Swapp{
public void swap(String[] x)
{
String temp = x[0];
x[0] = x[1];
x[1] = temp;
}
public static void main(String[] args)
{
Swapp sp= new Swapp();
String x[]= new String[]{new String("Mohamed"), new String("Ibrahim")};
System.out.println("x[0]=" + x[0] + " x[1]=" + x[1]);
sp.swap(x);
System.out.println("x[0]=" + x[0] + " x[1]=" + x[1]);
}
}

• Swapping Matt Gerrans December 12, 2001 at 5:19 PM (0)
• Swapping Matt Gerrans December 12, 2001 at 5:19 PM (0)