By Mughal K. A., Rasmussen R.

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It is important to note that the declarations above do not create objects of class Pizza or Hamburger. They only create variables which can store references to objects of these classes. A declaration can also include an initializer to create an object that can be assigned to the reference variable: Pizza yummyPizza = new Pizza("Hot&Spicy"); // Declaration with initializer. The reference variable yummyPizza can reference objects of class Pizza. The keyword new, together with the constructor call Pizza("Hot&Spicy"), creates an object of class Pizza.

Exit, class and while are keywords in the Java language. return, goto and default are keywords in the Java language. for, while and next are keywords in the Java language. Is this a complete and legal comment? /* // */ Select the one right answer. (a) No, the block comment (/* ... ) comments out the closing part. (b) It is a completely valid comment. The // part is ignored by the compiler. (c) This combination of comments is illegal and the compiler will reject it. 1 gives an overview of the primitive datatypes in Java.

In Java, reference variables must be declared and initialized before they can be used. A reference variable has a name and a type or class associated with it. A reference variable declaration, in its simplest form, can be used to specify the name and the type. This determines what objects a reference variable can denote. Pizza yummyPizza; // Variable yummyPizza can reference objects of class Pizza. Hamburger bigOne, // Variable bigOne can reference objects of class Hamburger, smallOne; // and so can variable smallOne.

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A Programmer's Guide to Java Certification: A Comprehensive Primer by Mughal K. A., Rasmussen R.


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