JAVA Interview Questions and Answers

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Programming Interview Questions» JAVA

JAVA Interview Questions

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What is noname class	Answer
what is tree? how it,s work	Answer
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Why does it take so much time to access an Applet having Swing Components the first time?	Answer
What is the difference between instanceof and isInstance?	Answer
What does the “final” keyword mean in front of a variable? A method? A class?	Answer
Describe what happens when an object is created in Java?	Answer
What is the difference amongst JVM Spec, JVM Implementation, JVM Runtime ?	Answer
How many static init can you have ?	Answer
What happens to a static var that is defined within a method of a class ?	Answer
Can a method be overloaded based on different return type but same argument type ?	Answer
What is Downcasting ?	Answer
What do you understand by private, protected and public?	Answer
What is the purpose of garbage collection?	Answer
What is the range of the short type?	Answer
What is a task’s priority and how is it used in scheduling?	Answer
To what value is a variable of the String type automatically initialized?	Answer
Can a for statement loop indefinitely?	Answer
What value does readLine() return when it has reached the end of a file?	Answer
Can an object’s finalize() method be invoked while it is reachable?	Answer
Does garbage collection guarantee that a program will not run out of memory?	Answer
Is sizeof a keyword?	Answer
What is the difference between the >> and >>> operators?	Answer
How does Java handle integer overflows and underflows?	Answer
What state does a thread enter when it terminates its processing?	Answer
Can a lock be acquired on a class?	Answer
How are Observer and Observable used?	Answer
What is a transient variable?	Answer
What does it mean that a method or class is abstract?	Answer
What does it mean that a class or member is final?	Answer
Why are there no global variables in Java?	Answer
Why can’t I say just abs() or sin() instead of Math.abs() and Math.sin()?	Answer
Whats the difference between notify() and notifyAll()?	Answer
How can my application get to know when a HttpSession is removed?	Answer
What interface must an object implement before it can be written to a stream as an object?	Answer
Which package is always imported by default?	Answer
What is your platform’s default character encoding?	Answer
What happens when you add a double value to a String?	Answer
What is the difference between the File and RandomAccessFile classes?	Answer
Are true and false keywords?	Answer
What are E and PI?	Answer

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JAVA Interview Questions and Answers

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