Java - Interview Questions and Answers for 'Object class' | Search Java Interview Question - javasearch.buggybread.com
Javasearch.buggybread.com
Share

Search Java Interview Questions


 2098 questions in repository.
 There are more than 200 unanswered questions.
Click here and help us by providing the answer.
Label / Company      Label / Company / Text

   



Interview Questions and Answers for 'Object class' - 5 question(s) found - Order By Newest

Very Very frequently asked. Among the first few questions in almost all interviews.Among Top 5 frequently asked questions.
  Q1. Difference between == and .equals() ?Core Java
Anonymous
Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory.

x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object.

Sample code:

String x = new String("str");
String y = new String("str");

System.out.println(x == y); // prints false
System.out.println(x.equals(y)); // prints true

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java   string comparison   string   object class   ==    equals   object equality     Ebay  Cerner  GuideWire  Expeditors Associate  Revature  SAIC  ValueLabs  Realty Redefined  Bank Of America  Capgemini  HCL Technologies  Goldman Sachs  Symmetric Corp  Backstop Solutions  Frontier  IQOR   Science  Vanguard  eClinicalWorks  Experticity  Blue Cross and Blue Shield of Kansas  ComTrade  Banja Luka  Overstock.com  Intrasoft International  IBM  Apex Systems  infoview technologies      basic        frequent

Try 6 Question(s) Test


Frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q2. What are the methods of Object Class ?Core Java
Anonymous
Ans. clone() - Creates and returns a copy of this object.

equals() - Indicates whether some other object is "equal to" this one.

finalize() - Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

getClass() - Returns the runtime class of an object.

hashCode() - Returns a hash code value for the object.

toString() - Returns a string representation of the object.

notify(), notifyAll(), and wait() - Play a part in synchronizing the activities of independently running threads in a program.

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java   oops   object class     Capgemini  NIIT Technologies   Virtusa  Goldman Sachs  PwC  Citi  Expeditors  SoftFluent  LinkedIn  Amadeus  Navteq  PLC Systems  Axtria Associate  Netcracker Technology  Altisource      basic        frequent

Try 1 Question(s) Test


 Q3. Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?Core Java
Anonymous
Ans. java.lang.StringBuffer.

  Sample Code for StringBuffer

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     java   object class   stringbuffer      expert        rare


 Q4. Can we override wait() or notify() methods?Core Java2017-01-19 13:59:12

Ans. wait and notify are declared final in object class and hence cannot be overridden.

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     object class methods  wait  notify


 Q5. Which of following is not the method of object class ?Core Java
a. run
b. notify
c. wait
d. clone

Ans.a. run



Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner



comments powered by Disqus
 

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.

Any input from you will be highly appreciated and It will unlock the application for 10 more requests.

Company Name:
Questions Asked:
         

X Close this

X Close this

Help Us Improve.
Please share your
interview experience.

Company Name:   


Questions Asked: