### 3. "Changing" a String

Answer:public 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 );
}
}

# "Changing" a String

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

1. Compute a new String object.
2. 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. Then the println() method 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.