INTRODUCTION TO CLASSES AND METHODS MCQS 05

INTRODUCTION TO CLASSES AND METHODS MCQS 05

1) Java memory management mechanism garbage collects objects which are no longer referenced
a true                    
b.false
Ans: a.

2) are objects referenced by a variable candidates for garbage collection when the variable goes out of scope?
a yes                   
b. no
Ans: a.

3) Java's garbage collector runs as a ___ priority thread waiting for __priority threads to relinquish the processor.
a.high                        
b.low c. both
Ans:c. 

4) The garbage collector will run immediately when the system is out of memory
a.true                       
b.false
Ans: a. 
 
5) You can explicitly drop a object reference by setting the value of a variable whose data type is a reference type to ___
Ans: null 
 
6) When might your program wish to run the garbage collecter?
a. before it enters a compute-intense section of code
b. before it enters a memory-intense section of code
c. before objects are finalized
d. when it knows there will be some idle time
e. a,b, and d
Ans: e

7) For externalizable objects the class is solely responsible for the external format of its contents
a.true                 
b.false
Ans: a 
 
8) When an object is stored, are all of the objects that are reachable from that object stored as well?
a.true                
b.false
Ans: a

9) The default__ of objects protects private and trancient data, and supports the __ of the classes
a.evolution                   
b.encoding

c. both
Ans:c.

10) Which are keywords in Java?
a) NULL          
b) size of 
c) friend        
d) extends      
e) synchronized
Ans : d and e