Java Programming and Dynamic Webpage Design Important Questions | BCA 5th Semester CCSU

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1. Java is a platform-independent: Justify.

Java is considered platform-independent because Java programs are compiled into bytecode, which can run on any machine with a Java Virtual Machine (JVM). The JVM acts as an intermediary, interpreting the bytecode for the host machine, making Java "write once, run anywhere" (WORA).

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2. Difference between JSP and Servlet:

Aspect	JSP (JavaServer Pages)	Servlet
Nature	HTML with Java code	Pure Java code
Ease of Use	Easier to write and maintain	More complex and verbose
Compilation	Automatically compiled by the server	Needs manual compilation
Usage	Used for presentation layer	Used for logic and processing

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3. Compare JDK, JRE, and JVM:

Component	Description
JDK (Java Development Kit)	Provides tools for developing Java applications, including JRE, compilers, and debuggers.
JRE (Java Runtime Environment)	A subset of JDK for running Java programs; includes JVM and libraries but not compilers.
JVM (Java Virtual Machine)	Executes Java bytecode and provides platform independence.

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4. What do you mean by a package in Java?

A package in Java is a namespace that organizes classes and interfaces. It helps avoid naming conflicts and makes it easier to locate and use the classes.

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5. Explain Servlet.

A servlet is a Java class used to handle HTTP requests and generate dynamic web content. It runs on a web server and extends the capabilities of servers.

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6. What is Applet Viewer? Explain.

The Applet Viewer is a command-line utility that lets you run and test Java applets without a web browser.

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7. Explain the main components of JSP.

• Directives: Control the JSP page's structure and processing.
• Scriptlets: Embed Java code within the JSP.
• Expressions: Output dynamic content.
• Custom tags and libraries: Simplify tasks.

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8. What do you mean by a package in Java?

(Same as Question 4)

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9. Difference between JDBC and ODBC:

Aspect	JDBC (Java Database Connectivity)	ODBC (Open Database Connectivity)
Language	Java-specific	Language-independent
Platform	Platform-independent	Platform-dependent
Security	More secure	Less secure

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10. Difference between a function and a method:

Aspect	Function	Method
Definition	Independent block of code	Function tied to an object
Context	Does not belong to an object	Belongs to an object

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11. Packages in Java: Creation and Example

Packages are created using the package keyword. Example:

package myPackage;
public class MyClass {
    public void display() {
        System.out.println("This is a package example.");
    }
}

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12. What is an Exception? Handling and Difference between throw and throws:

• Exception: An event that disrupts the normal flow of a program.
• Handling: Using try, catch, finally.
• Throw vs. Throws:
  • throw: Used to explicitly throw an exception.
  • throws: Declares exceptions in the method signature.

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13. Various AWT Controls:

• Button
• Checkbox
• TextField
• Label Example: The Button control allows users to perform actions by clicking.

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14. Features of Java Programming Language:

• Platform-independent
• Object-oriented
• Secure
• Multithreaded
• Robust

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15. Inheritance in Java and Its Types:

Inheritance allows a class to inherit properties from another. Types:

• Single
• Multilevel
• Hierarchical
• Hybrid

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16. Explain Socket and Its Types:

A socket is an endpoint for communication between two machines. Types:

• Stream socket
• Datagram socket Example: Socket and ServerSocket classes in Java.

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17. Explain the Following:

• Multi-threading: Executing multiple threads concurrently.
• Encapsulation: Wrapping data and code into a single unit.

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18. Explain the Following:

• Super and Final: super calls the parent class; final restricts modifications.
• CSS: Styles web pages.
• RMI: Enables remote method invocation.

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19. Layout Manager in Java and Its Types:

• Types: BorderLayout, GridLayout, FlowLayout, etc. Example:

Frame f = new Frame();
f.setLayout(new FlowLayout());

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20. Explain the Following:

• HTML Tags: Define web content structure (e.g., <div>, <p>).
• HTTP: Protocol for web communication.
• Networking: Facilitates communication between devices.

NOTE : 

• This is an expected question answer which you have appeared in most of the exams. You will be able to study chapterwise most important topics as per your knowledge and will not be afraid of giving the paper. This is a great tool to improve your preparation.

• The answers which are given in short cut or less words, here you can write and read them according to your understanding.