Introduction to Java Programming - Answers Repository

Welcome to the Introduction to Java Programming repository! This repo contains answers and resources for Units 1 to 15 of the course. Each unit addresses different aspects of Java programming, from basic concepts to more advanced topics. (NOT ALL 100s)

Table of Contents

• Unit 1: Creating Java Programs
• Unit 2: Using Data
• Unit 3: Using Methods and Classes
• Unit 4: More Object Concepts
• Unit 5: Making Decisions
• Unit 6: Looping
• Unit 7: Characters, Strings & String Builder
• Unit 8: Arrays
• Unit 9: Advanced Array Topics
• Unit 10: Intro to Inheritance
• Unit 11: Advanced Inheritance Concepts
• Unit 12: Exception Handling
• Unit 13: File Input & Output
• Unit 14: Intro to Swing Components
• Unit 15: Networking

Unit 1: Creating Java Programs

• Key Concepts: Basic Java program structure, compiling, and running Java applications.
• Answer Summary: Java programs are structured in classes and must contain a main method as the entry point.

Unit 2: Using Data

• Key Concepts: Primitive data types, variables, type conversion.
• Answer Summary: Java supports several primitive data types: int, double, char, boolean, etc. Variables must be declared with a specific data type.

Unit 3: Using Methods and Classes

• Key Concepts: Method declaration, parameters, return types, class definitions.
• Answer Summary: Methods encapsulate functionality and can accept parameters and return values. Classes are blueprints for creating objects.

Unit 4: More Object Concepts

• Key Concepts: Encapsulation, access modifiers, constructors.
• Answer Summary: Encapsulation restricts access to certain components of a class, enhancing data hiding. Constructors initialize new objects.

Unit 5: Making Decisions

• Key Concepts: Conditional statements (if, switch).
• Answer Summary: Decision-making structures allow the program to execute different paths based on conditions.

Unit 6: Looping

• Key Concepts: For loops, while loops, do-while loops.
• Answer Summary: Loops enable repeated execution of code blocks until a condition is met, improving code efficiency.

Unit 7: Characters, Strings & String Builder

• Key Concepts: String manipulation, StringBuilder class.
• Answer Summary: Strings are immutable in Java; StringBuilder allows for mutable sequences of characters.

Unit 8: Arrays

• Key Concepts: Array declaration, initialization, and access.
• Answer Summary: Arrays are used to store multiple values in a single variable and can hold both primitive types and objects.

Unit 9: Advanced Array Topics

• Key Concepts: Multidimensional arrays, array methods.
• Answer Summary: Multidimensional arrays can be used to represent matrices or grids, and Java provides methods for array manipulation.

Unit 10: Intro to Inheritance

• Key Concepts: Base classes and derived classes.
• Answer Summary: Inheritance allows a new class to inherit properties and methods from an existing class, facilitating code reuse.

Unit 11: Advanced Inheritance Concepts

• Key Concepts: Abstract classes, interfaces.
• Answer Summary: Abstract classes cannot be instantiated, while interfaces define a contract for classes to implement methods.

Unit 12: Exception Handling

• Key Concepts: Try-catch blocks, throw, throws.
• Answer Summary: Exception handling is used to manage errors gracefully, allowing a program to continue running even when an error occurs.

Unit 13: File Input & Output

• Key Concepts: Reading and writing files in Java.
• Answer Summary: Java provides classes for file I/O, enabling data persistence beyond program execution.

Unit 14: Intro to Swing Components

• Key Concepts: Creating GUI applications using Swing.
• Answer Summary: Swing provides a rich set of components for building graphical user interfaces in Java.

Contribution

Feel free to contribute to this repository by adding more answers or resources related to each unit.