"Changing" a String

Answer:

class ImmDemo
{
  public static void main ( String[] args )
  {
    String str = new String("I recognize the vestiges of an old flame.");
    str = str.substring( 16 );
    System.out.println( str );
  }
}

A common mistake is to think "make a change" to a string, but to then attempt to change an immutable object. When you think "make a change" you need to do two things:

Compute a new String object.
Assign the reference to the new string to a reference variable.

The diagram shows how the second version of the program works. The reference variable str is first assigned a reference to the original object. Then a new object is constructed by substring(). The new reference is assigned to str. println() is called with the new reference, so the new string is written.

QUESTION 3:

Which character corresponds to index 0 in the following string?

I recognize the vestiges of an old flame.