Advanced Java Programming (4351603) - Summer 2024 Solution

Question 1(a) [3 marks]

Explain the difference between AWT and Swing.

Answer:

Key Points:

• Heavy vs Light: AWT uses native OS components, Swing uses pure Java
• Appearance: AWT follows OS style, Swing offers consistent look across platforms
• Features: Swing provides more advanced components like JTable, JTree

Mnemonic: "Swing Provides Lightweight Components"

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Question 1(b) [4 marks]

Explain Mouse Motion Listener with example.

Answer:

MouseMotionListener interface handles mouse movement events in Java Swing applications.

Table: Mouse Motion Events

Code Example:

Java

Mnemonic: "Mouse Motion Makes Dynamic"

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Question 1(c) [7 marks]

Develop a program to create checkboxes for different courses belonging to a university such that the course selected would be displayed.

Answer:

Java

Key Features:

• ItemListener: Detects checkbox state changes
• Dynamic Display: Updates selected courses in real-time
• Multiple Selection: Allows selecting multiple courses

Mnemonic: "Check Items Listen Dynamically"

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Question 1(c) OR [7 marks]

Develop a program to Implement Traffic signal (Red, Green and Yellow) by using Swing components (Using JFrame, JRadioButton, ItemListener etc.)

Answer:

Java

Diagram:

goat

Mnemonic: "Radio Buttons Paint Graphics"

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Question 2(a) [3 marks]

Explain JDBC type-4 driver.

Answer:

JDBC Type-4 Driver (Native Protocol Driver)

Key Points:

• Pure Java: No native code required
• Direct Connection: Communicates directly with database
• Network Protocol: Uses database's native network protocol
• Best Performance: Fastest among all driver types

Mnemonic: "Pure Java Direct Protocol"

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Question 2(b) [4 marks]

Explain Commonly used Methods of Component class.

Answer:

Table: Component Class Methods

Key Features:

• Layout Management: Controls component arrangement
• Visibility Control: Shows/hides components
• Size Management: Controls component dimensions
• Container Operations: Manages child components

Mnemonic: "Add Set Get Visibility"

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Question 2(c) [7 marks]

Develop a program using JDBC to display student's record (Enroll No, Name, Address, Mobile No and Email-ID) from table 'StuRec'.

Answer:

Java

Database Table Structure:

SQL

Mnemonic: "Connect Query Display Records"

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Question 2(a) OR [3 marks]

Write down the advantages and disadvantages of JDBC.

Answer:

Table: JDBC Advantages and Disadvantages

Key Points:

• Portability: Works across different platforms and databases
• Standardization: Uniform API for database operations
• Performance: Additional layer causes overhead
• Complexity: Requires proper resource management

Mnemonic: "Platform Independent Standard Complex"

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Question 2(b) OR [4 marks]

Explain Border Layout.

Answer:

BorderLayout divides container into five regions: North, South, East, West, and Center.

Diagram:

goat

Table: Border Layout Regions

Code Example:

Java

Mnemonic: "North South East West Center"

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Question 2(c) OR [7 marks]

Develop an application to store, update, fetch and delete data of Employee (NAME, AGE, SALARY and DEPARTMENT) using Hibernate CRUD operations.

Answer:

Employee Entity Class:

Java

CRUD Operations Class:

Java

Mnemonic: "Save Get Update Delete Hibernate"

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Question 3(a) [3 marks]

Explain Deployment Descriptor.

Answer:

Deployment Descriptor (web.xml) is configuration file for web applications containing servlet mappings, initialization parameters, and security settings.

Table: Deployment Descriptor Elements

Key Features:

• Configuration: Central configuration for web app
• Servlet Mapping: URL to servlet mapping
• Parameters: Initialization and context parameters
• Security: Authentication and authorization settings

Mnemonic: "Web XML Configuration Mapping"

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Question 3(b) [4 marks]

Explain the difference between get and post method in servlet.

Answer:

Table: GET vs POST Methods

Key Points:

• Visibility: GET data visible in URL, POST hidden
• Capacity: POST can handle large data
• Security: POST better for sensitive data
• Usage: GET for fetching, POST for form submission

Mnemonic: "GET Visible Limited, POST Hidden Unlimited"

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Question 3(c) [7 marks]

Develop a simple servlet program which maintains a counter for the number of times it has been accessed since its loading; initialize the counter using deployment descriptor.

Answer:

Servlet Code:

Java

web.xml Configuration:

xml

Key Features:

• Thread Safety: Synchronized counter increment
• Initialization: Counter initialized from web.xml
• Persistent: Counter maintained across requests
• Configuration: Deployment descriptor setup

Mnemonic: "Initialize Synchronize Count Display"

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Question 3(a) OR [3 marks]

Explain the life cycle of a servlet.

Answer:

Servlet Life Cycle Diagram:

Table: Servlet Life Cycle Methods

Key Points:

• Initialization: Called once when servlet loads
• Service: Handles all client requests
• Cleanup: Called before servlet unloads
• Container Managed: Web container controls lifecycle

Mnemonic: "Initialize Service Destroy"

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Question 3(b) OR [4 marks]

Explain Servlet Config class with suitable example.

Answer:

ServletConfig provides servlet-specific configuration information and initialization parameters.

Table: ServletConfig Methods

Example:

Java

web.xml:

xml

Mnemonic: "Config Gets Parameters Context"

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Question 3(c) OR [7 marks]

Develop a simple program, when user select the subject code, name of the subject will be displayed using servlet and mysql database.

Answer:

HTML Form (index.html):

HTML

Servlet Code:

Java

Database Table:

SQL

Mnemonic: "Select Query Display Subject"

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Question 4(a) [3 marks]

Explain JSP life cycle.

Answer:

JSP Life Cycle Diagram:

Table: JSP Life Cycle Phases

Mnemonic: "Translate Compile Load Initialize Service Destroy"

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Question 4(b) [4 marks]

Compare JSP and Servlet.

Answer:

Table: JSP vs Servlet Comparison

Key Points:

• Ease of Use: JSP easier for presentation layer
• Performance: Servlet better for business logic
• Flexibility: JSP better for dynamic content
• Control: Servlet provides more control

Mnemonic: "JSP Easy HTML, Servlet Pure Java"

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Question 4(c) [7 marks]

Develop a JSP web application to display student monthly attendance in each subject of current semester via enrolment number.

Answer:

Input Form (attendance.html):

HTML

JSP Page (attendanceCheck.jsp):

jsp

Database Tables:

SQL

Mnemonic: "JSP Database Query Display Table"

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Question 4(a) OR [3 marks]

Explain implicit objects in JSP.

Answer:

Table: JSP Implicit Objects

Key Features:

• Automatic: Available without declaration
• Scope Access: Different scope levels
• Request Handling: Input/output operations
• Session Management: User session tracking

Mnemonic: "Request Response Out Session Application"

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Question 4(b) OR [4 marks]

Explain why JSP is preferred over servlet.

Answer:

Table: JSP Advantages over Servlet

Key Points:

• Separation of Concerns: Clear separation of presentation and business logic
• Rapid Development: Faster development cycle
• Designer Friendly: Web designers can work with HTML-like syntax
• Automatic Features: Container handles compilation and lifecycle

Mnemonic: "Easy HTML Automatic Designer Friendly"

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Question 4(c) OR [7 marks]

Develop a JSP program to display the grade of a student by accepting the marks of five subjects.

Answer:

Input Form (gradeInput.html):

HTML

JSP Grade Calculator (gradeCalculator.jsp):

jsp

Grade Scale Table:

Mnemonic: "Calculate Total Percentage Grade Result"

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Question 5(a) [3 marks]

Explain Aspect-oriented programming (AOP).

Answer:

AOP is programming paradigm that separates cross-cutting concerns from business logic using aspects.

Table: AOP Core Concepts

Key Benefits:

• Separation: Separates business logic from system services
• Modularity: Improves code modularity
• Reusability: Cross-cutting concerns are reusable
• Maintenance: Easier to maintain and modify

Mnemonic: "Aspect Join Pointcut Advice Weaving"

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Question 5(b) [4 marks]

List various features of Servlet.

Answer:

Table: Servlet Features

Key Points:

• Performance: Better performance than CGI
• Memory Management: Efficient memory usage
• Multithreading: Handles multiple requests simultaneously
• Extensible: Can be extended for specific protocols

Mnemonic: "Platform Server Protocol Persistent Robust"

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Question 5(c) [7 marks]

Explain Model layer, View layer and Controller layer in details.

Answer:

MVC Architecture Diagram:

Table: MVC Layer Details

Model Layer Details:

• Data Access: Database operations and data persistence
• Business Logic: Core application logic and rules
• Validation: Data validation and integrity checks
• Entity Classes: Java beans representing data structures

Example Model:

Java

View Layer Details:

• Presentation: User interface rendering
• Display Logic: How data is presented to user
• User Interaction: Forms, buttons, navigation
• Responsive Design: Adapts to different devices

Controller Layer Details:

• Request Handling: Processes user requests
• Flow Control: Determines next view to display
• Model Coordination: Calls appropriate model methods
• Response Generation: Prepares response for user

Example Controller:

Java

Benefits of MVC:

• Separation of Concerns: Clear responsibility division
• Maintainability: Easier to maintain and modify
• Testability: Each layer can be tested independently
• Scalability: Supports large application development
• Team Development: Multiple developers can work simultaneously

Mnemonic: "Model Data View Present Controller Handle"

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Question 5(a) OR [3 marks]

Explain Features in Spring Boot.

Answer:

Table: Spring Boot Features

Key Benefits:

• Rapid Development: Quick project setup and development
• Convention over Configuration: Sensible defaults
• Microservices Ready: Easy microservices development
• Cloud Native: Ready for cloud deployment

Mnemonic: "Auto Starter Embedded Production Annotation Developer"

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Question 5(b) OR [4 marks]

Write Short note on JSP scripting elements.

Answer:

Table: JSP Scripting Elements

Examples:

jsp

Key Points:

• Scriptlet: Contains Java statements
• Expression: Evaluates and outputs result
• Declaration: Creates instance variables/methods
• Directive: Provides page-level information

Mnemonic: "Script Express Declare Direct Comment"

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Question 5(c) OR [7 marks]

Explain Dependency injection (DI) and Plain Old Java Object (POJO) in details.

Answer:

Dependency Injection (DI):

Dependency Injection is design pattern where objects receive their dependencies from external source rather than creating them internally.

Table: DI Types

DI Example:

Java

Spring DI Configuration:

Java

Plain Old Java Object (POJO):

POJO is simple Java object that doesn't inherit from any specific framework classes or implement specific interfaces.

POJO Characteristics:

• No inheritance: Doesn't extend framework classes
• No interfaces: Doesn't implement framework interfaces
• No annotations: Can work without framework annotations
• Simple: Contains only business logic and data

POJO Example:

Java

Benefits of DI:

• Loose Coupling: Reduces dependencies between classes
• Testability: Easy to inject mock objects for testing
• Flexibility: Easy to change implementations
• Maintainability: Easier to maintain and extend code

Benefits of POJO:

• Simplicity: Easy to understand and maintain
• Testability: Simple to unit test
• Portability: Can be used across different frameworks
• Lightweight: No framework overhead

DI and POJO Together:

Java

Mnemonic: "DI Injects Dependencies, POJO Plain Objects"