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(C) 2010 Pearson Education, Inc. All rights reserved. What is static? Java™ How to Program, 8/e (C) 2010 Pearson Education, Inc. All rights reserved.

(C) 2010 Pearson Education, Inc. All rights reserved. 8.11 static Class Members In certain cases, only one copy of a particular variable should be shared by all objects of a class. A static field—called a class variable—is used in such cases. A static variable represents classwide information—all objects of the class share the same piece of data. The declaration of a static variable begins with the keyword static. (C) 2010 Pearson Education, Inc. All rights reserved.

(C) 2010 Pearson Education, Inc. All rights reserved.

8.11 static Class Members (Cont.) A static method cannot access non-static class members, because a static method can be called even when no objects of the class have been instantiated. For the same reason, the this reference cannot be used in a static method. The this reference must refer to a specific object of the class, and when a static method is called, there might not be any objects of its class in memory. If a static variable is not initialized, the compiler assigns it a default value. (C) 2010 Pearson Education, Inc. All rights reserved.

(C) 2010 Pearson Education, Inc. All rights reserved.

(C) 2010 Pearson Education, Inc. All rights reserved.

(C) 2010 Pearson Education, Inc. All rights reserved.

(C) 2010 Pearson Education, Inc. All rights reserved.

(C) 2010 Pearson Education, Inc. All rights reserved.

(C) 2010 Pearson Education, Inc. All rights reserved.