Interested to Buy Any Domain ? << Click Here >> for more details...
how tha garbage collector know that the object will be
deleted? on which algorithm the garbage collector works?
what is the working principle of garbage collector? How
manay types of garbage collectors r there?
- 1 Answers
- 7291 Views
- HP, SparkTG, I also Faced
- E-Mail Answers
An object is eligible for garbage collection when it
determines no more references to the object exists.
Algorithms that are used for garbage collection.
1 – Reference Counting:
Each object has an associated reference count. This count
indicates the number of active references to that object.
If this count is zero, it is garbage and can be recycled.
Whenever the reference is modified, the count is updated.
Once this count is zero, the memory is reclaimed.
2 – Tracing Collectors:
Mostly the standard garbage collectors do not use Reference
Counting. They will use some form of tracing collector’s
algorithms. This algorithm will trace all objects starting
from root until all reachable objects have been examined.
3 – Mark-Sweep collectors:
This is most basic form of collector algorithm. In this
case the collector visits each node starting from root and
marks each node. Once there are no any references, the
collection is complete. The heap is swept and the objects
not marked are reclaimed and returned to free list.
4 – Copying Collectors:
In this case, the heap is divided into equally sized semi
spaces. One with active data and another with unused. Once
the active space fills up, the objects are copied from
active to unused space and the roles are flipped becoming
unused space as active. This has advantages as it examines
only active data. But will have a overhead of copying data
from active to unused space.
5 – Heap Compaction:
In the copying collectors, the set of live objects can be
compacted at the bottom of heap. This improves locality of
reference and eliminates heap fragmentation and greatly
reduces the cost of object allocation which eliminates the
need to maintain free lists or look-aside lists or perform
best-fit or first-fit algorithms and allocating N bytes is
simple to add N to heal pointer.
| Is This Answer Correct ? | 5 Yes | 0 No |
Where import statement is used in a java program?
What is clipping?
84. try { 85. ResourceConnection con = resourceFactory.getConnection(); 86. Results r = con.query(”GET INFO FROM CUSTOMER”); 87. info = r.getData(); 88. con.close(); 89. } catch (ResourceException re) { 90. errorLog.write(re.getMessage()); 91. } 92. return info; Which is true if a ResourceException is thrown on line 86? 1 Line 92 will not execute. 2 The connection will not be retrieved in line 85. 3 The resource connection will not be closed on line 88. 4 The enclosing method will throw an exception to its caller.
How do you include a string in java?
could you run the java program without main method?
What is the Scope of Static Variable?
what are the states associated in the thread? : Java thread
Explain about collection interface in java?
There are 2 different ways to create an object. a)By using keyword "new" b)By using Class.forName ("className").newInstance(); What is the difference between these 2 methods.
What are the 8 data types in java?
Can you explain the cs option of java interpreter?
how to use finalize()Method to resources
Core Java 
