If print() changes the value held in st, will this change the actual object?

A good answer might be:

No---the formal parameter st is a reference to the object, not the actual object itself. Changing the reference will not change the object.

Changing a Reference Parameter

Here is an altered program in which the print() method changes the value held in its formal parameter.

class ObjectPrinter2
{
  public void print( String st )
  {
    System.out.println("First value of parameter: " + st );

    st = "Hah! A second Object!" ;

    System.out.println("Second value of parameter: " + st );

  }
}

class OPTester2
{
  public static void main ( String[] args )
  {
    String message = "Original Object" ;


    ObjectPrinter op = new ObjectPrinter();

    System.out.println("First  value of message: " + message );    

    op.print( message );

    System.out.println("Second value of message: " + message );    
  }
}

QUESTION 8:

What is the output of the program?

First  value of message: 
First value of parameter: 
Second value of parameter: 
Second value of message:

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