Tag: java

Questions Related to java

What are the programming constructs?
java

  1. Sequential

  2. Selection -- if and switch statements

  3. Iteration -- for loop, while loop and do-while loop

  4. none of the above

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Correct Option: A

What is output of the above program?

class conditional {
 public static void main(String args[]) {
   int i = 20;
   int j = 55;
   int z = 0;
   z = i < j ? i : j; // ternary operator
   System.out.println("The value assigned is " + z);
 }
}
java

  1. The value assigned is 20

  2. The value assigned is 60

  3. The value assigned is 30

  4. The value assigned is 50

  5. The value assigned is 40

Show answer
Correct Option: A

Can a for statement loop indefintely?
java

  1. Yes

  2. No

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Correct Option: A

What is a thin-client application?

java

  1. A browser that uses a plug-in to process user data.

  2. A distributed application where the client program does not process datA. but instead passes data for processing to an enterprise bean running on an application server.

  3. An application that cannot be stopped by a firewall.

  4. An application compiled with the -thin option of the javac command

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Correct Option: B

What is a J2EE component?
java

  1. Special icons for creating the user interface elements for thin clients.

  2. A data module saved to the component area of the database.

  3. A self-contained functional software unit that is assembled into a J2EE application and interfaces with other application components

  4. A JAR file

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Correct Option: C

What advantage does an entity bean have over a session bean?

java

  1. Entity bean data survives crashes.

  2. An entity bean represents non-persistent data.

  3. It creates its own JAR file during deployment.

  4. You get authentication code without having to write any.

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Correct Option: A

When do you use a session bean?

java

  1. When you want to be certain your application data persists between program invocations, even in the event of a crash.

  2. If you need to initiate a database transaction.

  3. To process transient data that can be re-created in the event of a crash.

  4. To keep people who do not know how to program from accidentally changing important logic code

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Correct Option: C

Why would you design a J2EE application so user data is entered by way of a JavaServer Page and managed by an underlying JavaBeans class?

java

  1. To make the user interface more interesting.

  2. To simplify application deployment.

  3. To prevent malicious programs from gaining access to sensitive information on your database server.

  4. To make the application much easier to update, maintain, and manage.

Show answer
Correct Option: D

Why is XML a good way to transfer text-based data from one program or tool to another?

java

  1. XML imposes important limitations on the receiving program or tool.

  2. The receiving program or tool can use the XML tagging information to determine how to best handle the incoming data.

  3. XML tags offer an extra level of security

  4. XML tags specify to the receiving program or tool exactly how to format and display the data.

Show answer
Correct Option: B

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) XML imposes important limitations on the receiving program or tool - This option is incorrect because XML does not impose limitations on the receiving program or tool. XML is a flexible data format that can be used in a wide range of applications.

Option B) The receiving program or tool can use the XML tagging information to determine how to best handle the incoming data - This option is correct. XML uses tags to structure and describe the data, allowing the receiving program or tool to understand the meaning and purpose of each element. This enables the receiving program or tool to process the data appropriately based on the tag information.

Option C) XML tags offer an extra level of security - This option is incorrect. XML tags do not provide any inherent security features. Security in data transfer is typically handled through encryption, authentication, and access control mechanisms.

Option D) XML tags specify to the receiving program or tool exactly how to format and display the data - This option is incorrect. XML tags define the structure and meaning of the data, but they do not dictate how the data should be formatted or displayed. Formatting and display are typically handled by the receiving program or tool based on its own rules and user preferences.

The correct answer is B) The receiving program or tool can use the XML tagging information to determine how to best handle the incoming data. This option is correct because XML tags provide valuable metadata that helps the receiving program or tool understand and process the data effectively.

Therefore, the correct answer is B) The receiving program or tool can use the XML tagging information to determine how to best handle the incoming data.

What part of the J2EE platform handles data storage and retrieval on behalf of a container-managed entity bean?

java

  1. The thin client.

  2. Deployment descriptors.

  3. The JAR file.

  4. The bean's container

Show answer
Correct Option: D