Most frequently asked java interview questions

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1.Difference between Abstract Class an Interface
2.Why we are using interface in java
3.Why we are using Abstract Class in java
4.Explain static Keyword.
5.Final,Finally, Finalize Keyword in java
6.What is meant by Abstraction
7.Given an example of Encapsulation
8.Difference & and && operators
9.Explain Assertion Keyword in java
10.What is mean serialization.
11.Default object of class in java
12.Default methods in java
13.Default Interfaces in java
14.What is the difference between String and String buffer
15.What is the difference between String Buffer and String Builder
16.what is meant String Tokenizer
17.Difference between Exception and Error with Example
18.Explain Exception Hirearchy
19.Difference between Checked and unchecked Exception with Example
20.Difference between ArrayList and vector
21.Difference between ArrayList and Array
22.Difference between ArrayList and Linked List
23.Define List, Map , Set
24.Difference between HashSet and TreeSet
25.Difference between HashMap and HashTable
26.Difference between HashMap and TreeMap
27.Difference between Comparable and Comparator
28.Difference collection and Collections
29.Explain Hashing alrogithm
30.Why we are using generic in java
31.Why we are using transien varaible in java
32.what is meant String literals in java
33.Difference between throw and throws keyword in java
34.Difference between Aggressition and composition in java
35.List and Map are synchronized in java explain with example
36.Why we are using arraylist in java
37.Why we are using Vector in java
38.Why we are using Linked List in java
39.What is meant fail fast in java
40.What is meant Singleton in java with example
41.Difference between static variable and instance variable
42.Difference between method overloading and overiding
43.Define this and Super keyword in java
44.Define Enum in java
45.Difference between List Iterator and Iterator
46.What is meant by Autoboxing
47.Difference between equals() and hashcode() method in java
48.Explain function of garbage collection in java
49.Difference between List and Set in java
50.Explain feature of Java 5 and Java 6 and Java 7

By:Vimal Kumar V(sr.software engineer,java)

Categories: Java interview Questions

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