Endgame in Chess by Fred Reinfeld

By Fred Reinfeld

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This class - it has the identifier MediaStore - keeps a record of the next available membership number. We don’t want to record this value with every Member object; instead, we keep a single record of it as a class variable in the MediaStore object. The code that follows aims to illustrate some of the properties of class variables. // Simplified version of the MediaStore class. public class MediaStore { // Declare a class variable. The first member will have a membership number // of 1000. private static int nextAvailableMembershipNumber = 1000; // Define a method that registers a new member with the Media Store.

N. B. Java is a // strongly-typed language. member = new Member( ); The first of the two statements above declares a variable called member of the Member (class) type; the second statement calls the default constructor of the Member class. The use of the keyword ‘new’ instantiates an object of the class Member and stores it in memory. Note that the two Java statements above can be combined into one, as follows: Member member = new Member( ); We now have an object reference, called member, to an instance of the Member class stored in memory.

Public class TestMember { public static void main( String[ ] args ) { Member member = new Member( ); // As before. member . setUserName( "Dylan" ); // As before. // Call the ‘get’ method of Member in a print statement. The method // call returns a value. println( “The member’s user name is: “ + member . getUserName( ) ); } // End of definition of main. } // End of class definition of TestMember. In the amended class definition of TestMember, the purpose of the ‘ + ‘ operator in the argument passed to the println method is to concatenate the literal String with the String that is returned from the call to getUserName.

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