Java question answers

 Set 16

Group A

1. Discuss JVM. Mention features of Java. Write a program in java to demonstrate multilevel inheritance.

2. Write a connection oriented socket program which can exchange the message between server and client once the connection is established.

3. Write a GUI program to calculate the sum and difference of two numbers input by the users as shown as below window.

Group B

4. Differentiate String and String Buffer class. Explain Exception handling mechanism with an example.

5. Explain the multithreaded programming in java with example.

6. What is JDBC? Explain different JDBC drivers.

7. What is the importance of Stub and Skeleton? Explain RMI architecture with a block diagram.

8. Describe the function of File class? Create a DataInputStream for a file name "purbanchal.dat" and store "I am student of BIT VI semester" in that file.

9. Explain the life cycle of applet with a block diagram.

10. What is request/response circle? What are the advantages using Servlets?

11. Write short notes on 1. Package 2. AWT vs Swing 3. Marshals and unmarshals of parameters.

Set 17

Group A

1. What is RMI? how does distributed application created using RMI? Explain with an example.

2. What is socket programming? Create chat programs using TCP.

3.  What is Swing? list out the features of swing. Create a swing application whose snapshot is shown in figure below:

your program should  add integer numbers entered in first and second text field and display sum in last field on clicking ok button.

Group B

4.What is byte code? Explain JVM and JRE.

5. Explain interface in Java. How does interface support polymorphism?

6. what is exception? Explain try, catch, throw and finally with example.

7. What is an applet? Explain its life cycle with example.

8. what is thread? What are the merits of multithreaded programming? Explain two ways of creating thread with example.

9.Explain differences between servlet and JSP.

10. What is jdbc? Explain the steps for connecting with any database using example.

11. Short notes on 1. Vector 2. JAR 3. Super and final keyword 4. J2EE

Set 18

Group A

1. What do you mean by polymorphism? How multiple inheritance is obtained in JAVA? Explain with an example.

2. Differentiate swing and AWT. Write a program using components to add two numbers. Use text fields for inputs and output. Your program should display the result when the user presses a button.

3. What is socket programming? Write down client/server chat program using TCP.

Group B

4. What are exceptions? Why is it important to handle exceptions? Discuss different keywords that are used to handle exception?

5. Discuss any five classes to handle files in java.

6. What is JDBC? Compare JDBC with ODBC. How do you execute SQL queries in JDBC?

7. What is JSP? Differentiate it with servlet. Discuss life cycle of servlet in brief.

8. What is Applet in java? Explain with its uses. Discuss border layout with suitable example.

9. Why multithreading is important in java programming? Write a program to create two threads in java.

10. What is RMI? Explain With its architecture. Differentiate it with CORBA.

11. What do you mean by event handling? Explain different JDBC driver type.

12. Explain features of Java programming. Write a program implementing class object.

Set 19

Group A

1. What makes RMI different with socket programming? Write program using RMI technology to send two numbers to the server and the server returning the greatest number between them.

2. What are JDBC and ODBC? Write a java program using JDBC to extract name of those students who live in Morang district, assuming that student table has four attributes (ID, name, district, and age).

3. What is the task of Socket class? Write program using socket program to send the string "hello" to the client.

Group B

4. Write a program in java that reads line of text from keyboard and write to file. Also read the content of the same file and display on monitor.

5. Write an object oriented program in java to find area of circle.

6. What is servlet in java? Discuss its life cycle.

7. What is thread? How it is created? Make a thread using runnable interface to display number from 1 to 20; each number should be displayed in the interval of 2 seconds.

8. What is the difference between error and an exception? How to create custom exceptions? Give an example.

9. What are the swing components? Create Swing application that receive a number through a JTextFields and display the square of numbers in JTextField when the SQUARE button is pressed.

10. What is an applet? Explain life cycle of an applet. how an image can be loaded in applet? Give example.

11. What is interface? Develop a java code to implement the interface concept for finding the sum and average of given N number.

Set 21

Group A

1. What is Swing and AWT? Create Swing application that receive two numbers through a JTextFields and display the multiplication of two numbers in a JTextField when the OK button is pressed and  when Exit button is pressed the program will terminate.

2. What is Distributed Application? Explain the steps to create RMI applications using example.

3. How socket class can be used in socket program? Write client-server chat programs in java.

Group B

4. What is JDBC? Explain different types of JDBC drivers. Write a JDBC program to display student details from student table.

5. What is the use of this keyword? How is multiple inheritances achieved in java? Give example.

6. How thread is created in java? Explain the different states of a thread. Write a program which will display your name in one thread and your address in another thread in every 500 milliseconds. There should be 10000 iteration.

7. Define polymorphism. Differentiate between overloading and overriding method with example.

8. What is an applet? How an image can be loaded in applet? Give example.

9. What is Exception handling? Explain try, catch and finally with an example.

10. Which classes are used to read and write data to file? Write a simple code to write a word to a file.

11. What is a Package? What are the benefits of using packages? Write down the steps in creating a package and using it in a java program with an example.

Set 22

Group A

1. Explain the basic concepts of object-oriented programming. Why is java known as platform-natural language? Explain the concept of virtual machine in java programming language along with block diagram.

2. Define socket. What are the use of TCP and UDP socket? Write a TCP socket program to send "Hello server" text to the remote machine listening on 9999 port and having 192.168.10.20 IP address.

3. Difference between Swing and AWT java GUI packages. Explain Swing Components along with example.

Group B

4. What are the difference between an array and a vector? Explain the advantage and disadvantage of both.

5. Write an applet program to calculate x to the power y where both x and y are integers.

6. Write a JDBC connection program with following details. a. Driver: com.mysql.jdbc.Driver. b. Host: localhost: c. Database: students d. User:root e. Password: secret f. Port: 3306

7. Discuss how object serialization and object deserialization are achieved.

8. Explain the lifecycle of Servlet with block diagram.

9. What is thread synchronization? Explain the concept of multithread in java with suitable example.

10. What is code reusability? Explain different mechanism to reuse the code in java.

11. What are Stub and Skeleton in Distributed Application? Explain its function with block diagram.

12. Write short notes on 1. polymorphism 2. applet vs Application 3. Marshalling and unmarshalling