CourseGenix

Java Fundamentals

5 Units21 Lessons

Unit 1

Basics

Introduction to Java Syntax and Hello World Program

Understanding Variables and Data Types in Java

Basic Operators in Java

Real-World Project: Building a Simple Calculator in Java

Input and Output Operations in Java

Unit 2

Control Structures and Loops

Real-World Project: Creating a Number Guessing Game with Loops

Implementing For and While Loops in Java

Using If-Else and Switch Statements in Java

Unit 3

Methods and Functions

Defining and Calling Methods in Java

Working with Parameters and Return Types in Java Methods

Method Overloading in Java

Real-World Project: Developing a String Utility Methods Library

Unit 4

Object-Oriented Programming

Creating Classes and Objects in Java

Inheritance and Polymorphism in Java

Encapsulation and Abstraction in Java

Using Interfaces and Abstract Classes in Java

Real-World Project: Designing a Basic Inventory Management System

Unit 5

Exception Handling and File I/O

Handling Exceptions with Try-Catch in Java

Creating and Using Custom Exceptions in Java

Reading and Writing Files in Java

Real-World Project: Building a Simple Text File Processor

Unit 3•Chapter 4

Real-World Project: Developing a String Utility Methods Library

Summary

Limit transcript summaries to 250 words or less. Exclude sponsors and unrelated content. Avoid introducing the topic in the summary.

Concept Check

0/10

What is the time complexity of a string reversal method?

O(n) where n is string length

O(1)

O(n)

O(n squared)

Which exception occurs for null input in string utils?

StringIndexOutOfBoundsException

NullPointerException

NullPointerException

IllegalArgumentException

How are string utility methods typically declared?

As abstract methods

As static methods

As instance methods

As static methods

What optimizes string concatenation in loops?

Use StringBuffer

Use StringBuilder

Use plus operator

Use StringBuilder

What does a string trim method remove?

Leading and trailing whitespace

Leading and trailing whitespace

Internal spaces only

All whitespace

In a string utility library, what is the most efficient way to reverse a string?

Use in-place array reversal for O(1) space.

Employ a stack data structure.

Apply recursive function calls.

Use string concatenation.

How should a string utility handle null inputs in a trim method?

Throw a NullPointerException immediately.

Ignore and proceed trimming.

Return the input unchanged.

Replace with an empty string.

What design pattern is ideal for extending string utility functions?

Singleton for instance control.

Decorator pattern for dynamic addition.

Observer for event handling.

Factory for object creation.

In string utilities, how to optimize palindrome checks for performance?

Reverse and compare directly.

Use recursion for substrings.

Check the string as is.

Convert string to lowercase first.

What is the time complexity for removing duplicates from a string using a Set?

O(n) with hash set operations.

O(1) constant time.

O(n log n) sorting involved.

O(n^2) nested loop checks.

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