Java Related Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

What will happen inside init() in servlet. my interviewer asked servlet lifecycle. i said "once servlet is loaded in to memory init() will be called which performs servlet initialization " . Again interview asked what values will be initialized . what is difference between init() and init(ServletConfig config).

Infinite Computer Solutions, TCS,

2 13432

my method "abc" return array of interface "xyz" and "pqr" is abstract class implements abc and class "jkl" extends pqr My problem 1) when i call abc it retrun array xyz how can i do this hint xyz refer_xyz = new jkl(); but i can't create array. 2)I want to access method of jkl using reference of xyz??

1 4032

why interaction with server using javascript is difficult

1 3984

why business logic written using servlets not in jsp. Jsp used for presentation purpose. serlvet used for coding business logic and controller logic. Reason for using servlets in business logic.

5 13264

How to send a request to garbage collector?

3 5356

StringBuilder s = new StringBuilder("Hello Mom");s.append(",I mean,Mother"); Response.Write(s.ToString()); String s = "Hello Mom"; s+ = ",I mean Mom"; Response.Write(s); Which is faster ? which uses the most memory?

HCL,

6 9273

how to deploy the application

Oracle, RBS,

1 3473

howmany types in garbage collection

7 19355

how to monitor the servers

4 10303

Un-Answered Questions { Java Related }

How is declarative handling of exceptions done in struts ?

1001

Can we extract main method from another class?

1026

What is a classloader in java?

1083

Write a program to find the whether a number is an Armstrong number or not?

1095

How can you inject java collection in spring?

503

What is the difference between equals() and == in java?

1032

What is lazy class?

480

explain different ways of using thread? : Java thread

1079

What are the contents on web.xml in struts application ?

1058

What are the differences between heap and stack memory in java?

1126

What if I write static public void instead of public static void?

928

what is reflection api? How are they implemented?

1102

Realized?

2256

What is action chaining ?

1158

What is java string pool?

1076

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