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Chapter 20

Chapter 20

Java Never Ends

This activity contains 15 questions.

	"Persistence" means...   None of the above Components retain their state (information) across invocations Components continue to attempt to complete their task(s), even in the event of error(s) Components are diligent about completing their task(s) before they terminate

	An example of the consistent interface found within the JavaBeans framework is:   None of the above the set- and get- prefixes used with accessor and mutator methods the listeners used within the Event Model the names used for Colors within the Java Color Model

	JavaBeans provide which services or abilities? Consistent interfaces Consistent event-handling model Persistence Introspection Builder support Polymorphism Encapsulation   All but (f) and (g) All but (g) All but (f) All of the above

	The Thread.sleep method:   pauses the program for the specified number of milliseconds None of the above pauses all threads running in the current program pauses the program for the specified number of microseconds

	What is the advantage of implementing the Runnable interface rather than extending Thread?   The Runnable interface allows you to implement your thread as an inner class You don't need to invoke start if you implement a thread as Runnable If your class already extends, say, JApplet or JFrame, then it cannot also extend Thread None of the above is correct

	Which statement(s) is (are) true about "persistence?" Persistence is a property of threads Persistence is a property of JavaBeans Persistence in any object (class) can be achieved using (de-)serialization Persistence support in Java resides in the Persistence package   True: (b), (c) True: (a), (b), (c) True: (b), (c), (d) True: All of the above

	Which statement(s) is (are) true about Enterprise JavaBeans? They extend the JavaBean framework They're targeted for business/commercial applications They provide a means to create an enterprise, like a business They provide at least the same services and abilities that JavaBeans do   True: All of the above True: (a), (b) True: (a), (d) True: All but (c)

	Which statement(s) is (are) true about how threads may be used? Threads can be used to separate independent tasks Threads can be used to allow time-consuming activities to complete in parallel with other activities Threads can be used to improve the responsiveness of GUIs Threads can be used to better utilize computational and hardware resources   True: All but (a) True: All of the above True: All but (d) True: (a), (d)

	Which statement(s) is (are) true about the start method? start is a member method of the Thread class start is a member method of the Runnable class Invoking start is optional - you only need do so if you've invoked a thread's stop method an you want the thread to resume execution Each time you invoke start you cause a new thread to begin to execute   True: (a), (c) True: (a), (d) True: (a) True: All of the above

	Which statement(s) is (are) true? Java supports multiple threads Since most PCs have only a single processor, one single-thread Java programs can run on most PCs Threads typically share computer resources, like memory and I/O devices If a computer has multiple processors, each might be tasked with running a different thread   True: All of the above True: (a), (d) True: (a), (c) True: (a), (c), (d)

	Which statement(s) is (are) true? JDBC provides access to Java's built-in database JDBC can be used to provide access to, say, Oracle JDBC only can provide a connection to databases that follow compatible databases - and not all databases are compatible You may place SQL statements directly into your Java source code if you use JDBC   True: All but (a) True: (b), (c) True: (b), (d) True: All of the above

	Which statement(s) is (are) true? Threads can be used to divide time-consuming tasks into independent components Threads run more or less independently of one-another If one or more threads sleep, other threads can continue to execute Threads can be used to respond with the semantics to be associated with events that occur during execution Java programs always have at least one thread   True: All but (d) True: All of the above True: (a), (b), (c) True: All but (e)

	Which statement(s) is (are) true? Threads must be created using an inner class Threads will not begin to execute until you explicitly invoke the thread's run method Java supports up to 100 threads at a time A thread begins to execute as soon as new Thread(); is executed   True: Only (c) True: None of the above True: (b), (d) True: All of the above

	Which statement(s) is (are) true? SQL is... short for "Standard Query Language short for "Structured Query Language a standard for database access included within Java via JDBC   True: (a), (c) True: (b), (c) True: (a), (c), (d) True: (b), (c), (d)

	Which statement(s) is (are) true? Today, most computer databases: are structured are relational are collections of tables of data are accessible via JDBC   True: All but (d) All of the above True: All but (b) True: (a), (b)

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