What could be put to XXX to prevent Thread collisions? : Questions « Thread « SCJP

1.	Java Source And Data Type
2.	Operators
3.	Modifiers
4.	Type Casting
5.	Statements
6.	Object Oriented
7.	Thread
8.	Utility Classes
9.	File

SCJP » Thread » Questions

7.11.29.What could be put to XXX to prevent Thread collisions?

class Board {

   Image[] pics = new Image[64];

   int active = 0;

   public boolean addPic( Image mg,int pos ){

     synchronized(XXX)

     { if( pics[pos] == null ){

        active++ ; pics[pos] = mg;

         return true;

       }

       else 

         return false;

     }

   }





   1. synchronized( this )

   2. synchronized( pics )

   3. synchronized( mg )

   4. synchronized( active )

7.11.Questions
	7.11.1.	The notify() method is defined in class java.lang.Thread(True/False)
	7.11.2.	Answer: notify
	7.11.3.	When a thread is waiting as a result of wait(), it releases its lock(True/False)
	7.11.4.	Answer: wait() and lock
	7.11.5.	The notify() method causes a thread to immediately release its lock(True/False)
	7.11.6.	Answer: notify and lock(2)
	7.11.7.	notifyAll() notifies all waiting threads, regardless of the object they're waiting on(True/False)
	7.11.8.	Answer: notifyAll and waiting threads
	7.11.9.	What is the result of this code(wait and time)?
	7.11.10.	Answer: wait and time
	7.11.11.	What is the result(extends Thread)?
	7.11.12.	Answer: extends Thread
	7.11.13.	What is the output(two threads)?
	7.11.14.	Answer: two threads
	7.11.15.	What is the output(joining thread)?
	7.11.16.	Answer: joining thread
	7.11.17.	What is the output(synchronized block and thread)?
	7.11.18.	Answer: synchronized block and thread
	7.11.19.	The following code will start the garbage collection mechanism(True/False)?
	7.11.20.	Answer: System.gc() and garbage collection
	7.11.21.	Calling Runtime.getRuntime().gc() will probably start the garbage collection mechanism, but there is no guarantee(True/False)?
	7.11.22.	Answer: Runtime.getRuntime().gc() and garbage collection
	7.11.23.	The garbage collection Thread has a low priority(True/False)?
	7.11.24.	Answer: garbage collection and thread
	7.11.25.	Which method must appear in the class to satisfy the Runnable interface requirements.
	7.11.26.	Answer: Runnable interface
	7.11.27.	Which statements are correct after executing the following line:
	7.11.28.	Answer: thread state
	7.11.29.	What could be put to XXX to prevent Thread collisions?
	7.11.30.	Answers: synchronized and synchronizable

www.java2java.com | Contact Us

All other trademarks are property of their respective owners.