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Headstrong Aptitude Paper

Posted on :30-03-2016
Q1. What modifiers may be used with an inner class that is a member of an outer class?

 A (non-local) inner class may be declared as public, protected, private, static, final, or abstract.If a method is declared as protected, where may the method be accessed? A protected method may only be accessed by classes or interfaces of the same package or by sub classes of the class in which it is declared.

Q2. What is an Iterator interface? 

The Iterator interface is used to step through the elements of a Collection.


Q3. What is the difference between yielding and sleeping? 

Yielding means a thread returning to a ready state either from waiting, running or after creation, where as sleeping refers a thread going to a waiting state from running state. With reference to Java, when a task invokes its yield() method, it returns to the ready state and when a task invokes its sleep() method, it returns to the waiting state.


Q4.  What are wrapper classes?

 Wrapper classes are classes that allow primitive types to be accessed as objects. For example, Integer, Double. These classes contain many methods which can be used to manipulate basic data types


Q5    Does garbage collection guarantee that a program will not run out of memory? 

No, it doesnt. It is possible for programs to use up memory resources faster than they are garbage collected. It is also possible for programs to create objects that are not subject to garbage collection. The main purpose of Garbage Collector is recover the memory from the objects which are no longer required when more memory is needed. Name Component sub classes that support painting? The following classes support painting: Canvas, Frame, Panel, and Applet.


Q6. What is a native method? 

A native method is a method that is implemented in a language other than Java. For example, one method may be written in C and can be called in Java.


Q7. How can you write a loop indefinitely?

for(;;) //for loop 
while(true); //always true


Q8. Can an anonymous class be declared as implementing an interface and extending a class? 

An anonymous class may implement an interface or extend a superclass, but may not be declared to do both.


Q9. What is the purpose of finalization? 

The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup processing before the object is garbage collected. For example, closing a opened file, closing a opened database Connection.


Q10.  What invokes a threads run() method? 

After a thread is started, via its start() method or that of the Thread class, the JVM invokes the threads run() method when the thread is initially executed.


Q11. What is the Gregorian Calendar class? 

The GregorianCalendar provides support for traditional Western calendars.


Q12. What is the SimpleTimeZone class? 

The SimpleTimeZone class provides support for a Gregorian calendar.


Q13. What is the Properties class? 

The properties class is a subclass of Hashtable that can be read from or written to a stream. It also provides the capability to specify a set of default values to be used.


Q14.  What is the purpose of the Runtime class? 

The purpose of the Runtime class is to provide access to the Java runtime system.


Q15. What is the purpose of the System class? 

The purpose of the System class is to provide access to system resources.


Q16.  What is the purpose of the finally clause of a try-catch-finally statement? 

The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught. For example,

try 
//some statements 
catch 
// statements when exception is cought 
finally 
//statements executed whether exception occurs or not 
}


Q17. What is the Locale class?

The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region.


Q18.  What must a class do to implement an interface? It must provide all of the methods in the interface and identify the interface in its implements clause.


Q19.    What is the difference between an Abstract class and Interface?


Q20.   What is user defined exception?


Q21.    What do you know about the garbage collector?


Q22.    What is the difference between java and c++?


Q23.    In an html form I have a button which makes us to open another page in 15 seconds. How will you do that?


Q24.  What is the difference between process and threads?      
  

Q25.  What is update method called?


Q26.  Have you ever used HashTable and Directory?


Q27.  What are statements in Java?


Q28. What is a JAR file?


Q29. What is JNI?


Q30. What is the base class for all swing components?


Q31. What is JFC?


Q32 . What is the difference between AWT and Swing?


Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE 3 times ? Where three processes are started or three threads are started?

Q33.   How does thread synchronization occur in a monitor?


Q34.    Is there any tag in html to upload and download files?


Q35.    Why do you canvas?


Q36.    How can you know about drivers and database information ?


Q37.    What is serialization?


Q38.   Can you load the server object dynamically? If so what are the 3 major steps involved in it?


Q39.  What is the layout for toolbar?


Q40.  What is the difference between Grid and Gridbaglayout?


Q41.  How will you add panel to a frame?


Q42. Where are the card layouts used?


Q43. What is the corresponding layout for card in swing?


Q44.  What is light weight component?


Q45.  Can you run the product development on all operating systems?


Q46.  What are the benefits if Swing over AWT?


Q47.  How can two threads be made to communicate with each other?


Q48. What are the files generated after using IDL to java compiler?


Q49. What is the protocol used by server and client?


Q50. What is the functionability stubs and skeletons?


Q51. What is the mapping mechanism used by java to identify IDL language?



  
   






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