str = new String( "You know my methods, Watson." );
public class StringDemo1
{
public static void main ( String[] args )
{
String str;
str = new String( "Elementary, my dear Watson!" );
}
}
Before the program runs, there is no object.
The new String object is created as the program runs.
The declaration
String str;
creates a reference variable,
but does not create a String object.
The variable str is used to refer to a String after one has been created.
The next statement
str = new String( "Elementary, my dear Watson!" );
creates an object
and puts a reference to that object in str.
After the program stops running,
the String object no longer exists.
Its memory is reclaimed by the computer system for other uses.
(Review: ) What are the two steps in an assignment statement?