Java Tutorials - Free Technical Questions 9 Large collection of Java interview questions

Large collection of Java interview questions

1.

What is the difference between an Abstract class and Interface ?
2.

What is user defined exception ?
3.

What do you know about the garbage collector ?

4.

What is the difference between C++ & Java ?
5.

Explain RMI Architecture?
6.

How do you communicate in between Applets & Servlets ?
7.

What is the use of Servlets ?
8.

What is JDBC? How do you connect to the Database ?
9.

In an HTML form I have a Button which makes us to open another page in 15 seconds. How will do you that ?
10.

What is the difference between Process and Threads ?
11.

What is the difference between RMI & Corba ?
12.

What are the services in RMI ?
13.

How will you initialize an Applet ?
14.

What is the order of method invocation in an Applet ?
15.

When is update method called ?
16.

How will you pass values from HTML page to the Servlet ?
17.

Have you ever used HashTable and Dictionary ?
18.

How will you communicate between two Applets ?
19.

What are statements in JAVA ?
20.

What is JAR file ?
21.

What is JNI ?
22.

What is the base class for all swing components ?
23.

What is JFC ?
24.

What is Difference between AWT and Swing ?
25.

Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE 3 times? Where 3 processes are started or 3 threads are started ?
26.

How does thread synchronization occurs inside a monitor ?
27.

How will you call an Applet using a Java Script function ?
28.

Is there any tag in HTML to upload and download files ?
29.

Why do you Canvas ?
30.

How can you push data from an Applet to Servlet ?
31.

What are 4 drivers available in JDBC ?
32.

How you can know about drivers and database information ?
33.

If you are truncated using JDBC, How can you know ..that how much data is truncated ?
34.

And What situation , each of the 4 drivers used ?
35.

How will you perform transaction using JDBC ?
36.

In RMI, server object first loaded into the memory and then the stub reference is sent to the client ? or whether a stub reference is directly sent to the client ?
37.

Suppose server object is not loaded into the memory, and the client request for it , what will happen?
38.

What is serialization ?
39.

Can you load the server object dynamically? If so, what are the major 3 steps involved in it ?
40.

What is difference RMI registry and OSAgent ?
41.

To a server method, the client wants to send a value 20, with this value exceeds to 20,. a message should be sent to the client ? What will you do for achieving for this ?
42.

What are the benefits of Swing over AWT ?
43.

Where the CardLayout is used ?
44.

What is the Layout for ToolBar ?
45.

What is the difference between Grid and GridbagLayout ?
46.

How will you add panel to a Frame ?
47.

What is the corresponding Layout for Card in Swing ?
48.

What is light weight component ?
49.

Can you run the product development on all operating systems ?
50.

What is the webserver used for running the Servlets ?
51.

What is Servlet API used for connecting database ?
52.

What is bean ? Where it can be used ?
53.

What is difference in between Java Class and Bean ?
54.

Can we send object using Sockets ?
55.

What is the RMI and Socket ?
56.

How to communicate 2 threads each other ?
57.

What are the files generated after using IDL to Java Compilet ?

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