28.6. JTabbedPane

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Review Questions

Sections 24.1 “24.4

24.1	Why do you need multithreading? How can multiple threads run simultaneously in a single-processor system?
24.2	How do you declare a task class? How do you create a thread for a task?
24.3	What would happen if you replace the start() method by the run() method in lines 14 “16 in Listing 24.1?
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24.4	What is wrong in the following two programs? Correct the errors.
24.5	Which of the following methods are instance methods in java.lang.Thread ? Which method may throw an InterruptedException ? Which of them are deprecated in Java 2? run , start , stop , suspend , resume , sleep , interrupt , yield , join
24.6	If a loop contains a method that throws an InterruptedException , why should the loop be placed inside a try-catch block?
24.7	How do you set a priority for a thread? What is the default priority?

Sections 24.5 “24.7

24.8	When should you use a timer or a thread to control animation? What are the advantages and disadvantages of using a thread and a timer?
24.9	What is the event dispatcher thread? How do you let a task run from the event dispatcher thread?

Section 24.8 Thread Pools

24.10	What are the benefits of using a thread pool?
24.11	How do you create a thread pool with three fixed threads? How do you submit a task to the thread pool? How do you know that all the tasks are finished?

Sections 24.9 “24.12

24.12	Give some examples of possible resource corruption when running multiple threads. How do you synchronize conflicting threads?
24.13	Suppose you place the statement in line 26 of Listing 24.7, AccountWithoutSync.java, inside a synchronized block to avoid race conditions, as follows : synchronized ( this ) { account.deposit( 1 ); } Does it work?
24.14	How do you create a lock object? How do you acquire a lock and release a lock?
24.15	How do you create a condition on a lock? What are the await() , signal() , and signalAll() methods for?
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24.16	What would happen if the while loop in lines 58 “59 of Listing 24.9, ThreadCooperation.java, is changed to an if statement?
24.17	Why does the following class have a syntax error? 1 import javax.swing.*; 2 3 public class Test extends JApplet implements Runnable { 4 public void init() throws InterruptedException { 5 Thread thread = new Thread( this ); 6 thread.sleep( 1000 ); 7 } 8 9 public synchronized void run() { 10 } 11 }
24.18	What is the possible cause for IllegalMonitorStateException ?
24.19	Can wait() , notify() , and notifyAll() be invoked from any object? What is the purpose of these methods?
24.20	What is wrong in the following code? synchronized (object1) { try { while (!condition) object2.wait(); } catch (InterruptedException ex) { } }

Section 24.13 Blocking Queues

24.21	What blocking queues are supported in JDK 1.5?
24.22	What method do you use to add an element to an ArrayBlockingQueue ? What happens if the queue is full?
24.23	What method do you use to retrieve an element from an ArrayBlockingQueue ? What happens if the queue is empty?

Section 24.14 Semaphores

24.24	What are the similarities and differences between a lock and a semaphore?
24.25	How do you create a semaphore that allows three concurrent threads? How do you acquire a semaphore? How do you release a semaphore?

Section 24.15 Avoiding Deadlocks

24.26

What is deadlock? How can you avoid deadlock?

Section 24.17 Synchronized Collections

24.27	What is a synchronized collection? Is ArrayList synchronized? How do you make it synchronized?
24.28	Explain why an iterator is fail-fast.

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Section 24.18 JProgressBar

24.29

For a JProgressBar , what is the property that displays the percentage of work completed? How do you set its orientation?