go to previous page   go to home page   go to next page

Answer:

Yes, a String reference is often a parameter.


String References as Parameters

String stringA = "Random Jottings";
String stringB = "Lyrical Ballads";

if ( stringA.equals( stringB ) ) 
  System.out.println("They are equal.");
else
  System.out.println("They are different.");


Method Call with reference Parameter

Some methods require a parameter that is a reference to a String object. The example program shows this.

The picture that shows how the method call works. (Both objects have many methods, but only the equals() method of one object is pictured.)

The String object referred to by stringA has an equals() method. That method is called with a parameter, a reference to another String object, stringB. The method checks if both String objects contain identical sequences of characters, and if so, evaluates to true.

Careful:   The previous paragraph is correctly stated, but awkward. People often say "String" when they really mean "reference to a String". This is fine, but remember that a reference variable like stringA does not contain an object, but only a reference to an object. This may seem picky, but there is nothing quite as picky as a computer. Students who are not careful about this often run into problems.


The Code What is usually said Careful meaning
stringA.equals( stringB ) The equals method of stringA is called with stringB. The equals method of the String referenced by stringA is called with the reference in stringB.

QUESTION 3:

(Review:) Examine the following snippet of code. Answer the questions using careful words (like the above on the right).

String a;
Point  b;

go to previous page   go to home page   go to next page