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Hai to all today Iam sharing Java interview questions and answer
here iam sharing the only Top Java interview questions and answers. one point to remember that java interview questions are not always written by experts so do cross check it before proceding. And morever do not butify Java interview questions as it is you may forget while interview.keep watching i will post some good posts here based on java interveiw questions free download for freshers.
Top 10 java interview questions.
Question1 Give the difference between an interface and an abstract class?
Answer: An interfaces cannot have members and methods whereas Abstract classes can have members,methods.
Question 2. When you will use abstract class or interface?
Answer : Interface is used only when you want to declare which methoad a class must have.if you have another implementation use abstract class.
Question 3. What Serializable interface do ?
Answer : Through this object can be seralized.
Question 4. can you force the garbage collection ?
Answer : No you cannot force Garbage collection automatic process.
Question5 Define Synchronization in Java ?
Answer : Synchronization is nothing but process of controlling the access of shared resources by the multiple threads .
Question 6. What is memory leak in java ?
Answer : It is an unreferenced object that will never be used again still hangs around in memory and doesnt get garbage collected.
Question7. Tell me difference between stringbuffer and stringbuilder ?
Answer : In case of StringBuffer is synchronized.StringBuilder is unsynchronized .
Question 8. give the difference between checked and unchecked exceptions ?
Answer : Unchecked exceptions represent defects in the program (bugs).
Furthermore, checked exceptions represent invalid conditions
Question 9. How does Java allocate stack and heap memory ?
Answer : based on object creation it will allocate stack and heap memory
Question 10. What do you mean by Java Reflection ?
Answer : Reflection is used when programs require the ability to examine or modify the runtime behavior of applications .
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