CF

Java Foundations: The Complete Course with Java 21 Updates

88h 37m 5s
English
Paid
Updated September 2026

Java Foundations: The Complete Course with Java 21 Updates is a 254-lesson 88 hours 37 minutes self-paced course by Udemy. This is a deliberately unhurried introduction to Java, built for complete beginners and anyone who prefers learning at a slower, more thorough pace over a rushed crash course.

Course facts

Lessons
254
Duration
88 hours 37 minutes
Level
All levels
Language
English
Updated
2026-09-11
Instructor
Udemy
Price
Premium

This is a deliberately unhurried introduction to Java, built for complete beginners and anyone who prefers learning at a slower, more thorough pace over a rushed crash course.

If you already know some Java

You can skip the familiar sections and focus on the topics many working developers still don't fully grasp: regular expressions, the Streams and Lambdas API, Optionals, the Date/Time API, and SQL/JDBC. Those sections go deeper here than in many standalone courses on the same subjects.

Object-oriented programming, done properly

A recurring theme is that many developers know Java's syntax without knowing how to use it to write complex, maintainable, team-friendly code, and OOP is treated as a core skill rather than a checklist.

Why it's taught this way

The instructor draws on real hiring and training experience, having watched which candidates succeed and which don't, and shapes the course around practical skills that actually matter for landing and growing into a developer role.

In this course, you will learn topics such as:

  • Object-Oriented Programming (OOP)
    • Many developers know the syntax of Java but lack the skills to utilize its capabilities for creating complex, maintainable, and team-friendly code.
  • Regular Expressions
    • Many Java developers are not well-versed in regular expressions, which makes text processing, validation, and key information extraction challenging. We will learn to use regular expressions to reduce code volume and increase its flexibility.
  • Functional Programming using Lambdas and Streams API
    • Despite the widespread use of functional programming, many Java developers have not mastered the capabilities of lambdas and the Streams API. We will explore these powerful tools to simplify and enhance data processing.
  • Optionals
    • The concept of "null" has caused numerous errors. Optionals aim to solve this problem, but many developers have yet to master their use. We will explore how to avoid issues related to null.
  • Date and Time API in Java 8
    • Java 8 introduced significant improvements in handling dates and times, but many developers have not mastered the new API. We will demonstrate how to work with dates and times correctly using a modern approach.
  • Working with Databases and SQL
    • Although many Java developers work with databases through frameworks like Spring Boot, this often leads to insufficient understanding of how these frameworks interact with the database. We will provide foundational knowledge to help you better utilize these tools.
  • Introduction to Spring Framework and Spring Boot
    • The Spring Framework and Spring Boot have revolutionized Java application development. These frameworks are almost always necessary for Java developers in the job market. We will introduce you to the basics of Spring and prepare you for the next step in your learning journey.

If you are ready to put in the effort and start a new stage of your career, join us!

Who teaches Java Foundations: The Complete Course with Java 21 Updates? Udemy

Udemy thumbnail

Udemy is the largest open marketplace for online courses on the internet. Founded in 2010 by Eren Bali, Oktay Caglar, and Gagan Biyani and headquartered in San Francisco, the company went public on the Nasdaq in 2021 under the ticker UDMY. The platform hosts well over two hundred thousand courses across software development, IT and cloud, data science, design, business, marketing, and creative skills, taught by tens of thousands of independent instructors. Roughly seventy million learners use it worldwide, and the corporate arm — Udemy Business — supplies a curated subset of that catalog to enterprise customers.

Because Udemy is a marketplace rather than a single editorial publisher, the catalog is uneven by design. The strongest material lives in the long-form, project-based courses authored by working engineers — full-stack JavaScript, React, Node.js, Python data science, AWS, Docker and Kubernetes, mobile development with Flutter and React Native, and cloud certification preparation. The CourseFlix listing under this source is the slice of that catalog that has been mirrored here for offline-friendly viewing, organized by topic and updated as new releases land. Pricing on Udemy itself swings dramatically with the site's near-permanent sales, which is why the platform is best treated as a deep reference catalog: pick instructors with strong reviews and a track record of updating their material rather than buying on the headline price alone.

What lessons are included in Java Foundations: The Complete Course with Java 21 Updates?

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0:00
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#1: 1 - Welcome to the World of Java
All Course Lessons (254)
#Lesson TitleDurationAccess
1
1 - Welcome to the World of Java Demo
03:20
2
2 - What is Java
05:06
3
3 - Installing JDK 21 IntelliJ IDE on MacOS with SDKMan Homebrew
15:57
4
4 - Installing JDK 21 IntelliJ IDE on Windows with Chocolatey
20:00
5
5 - Legacy Lesson Install JDK 17 on Windows
03:04
6
6 - Legacy Lesson Install JDK 17 on MacOS
04:13
7
7 - Legacy Lesson Installing a Java Editor IntelliJ IDE
05:44
8
8 - Hello World Our First Simple Application
09:17
9
9 - Asking for Help
06:33
10
10 - Coding Exercises for the Whole Course
06:25
11
12 - Object Orientation
34:44
12
13 - Class Basics
17:53
13
14 - Variables Data Types
18:51
14
15 - var Variables
06:50
15
16 - Simple Collections with Arrays
19:58
16
17 - Methods
32:55
17
18 - Varargs
11:25
18
19 - Static Methods
09:04
19
20 - Static Variables
06:28
20
21 - Static Initializers
05:42
21
22 - The Object Superclass
15:02
22
23 - Member Visibility Methods
33:12
23
24 - Member Visibility Fields
07:20
24
25 - Constructors
22:51
25
26 - Getters Setters
22:46
26
28 - Intro
00:58
27
29 - Creating Strings
17:09
28
30 - Upper Lower Casing
10:00
29
31 - Strings Blank or Empty
05:39
30
32 - Replacing Text Within Strings
06:30
31
33 - Removing White Space strip
19:10
32
34 - Getting Individual Characters of a String charAt
05:28
33
35 - Comparing String for Alphabetical Order compareTo
09:36
34
36 - Determining if Text is Contained in a String contains
03:18
35
37 - String Concatenation concat
29:16
36
38 - Determining the Length of a String length
10:34
37
39 - Getting Parts of a String substring
20:37
38
40 - Searching within a String indexOf
32:12
39
41 - Splitting String Apart split
23:39
40
42 - Beginning Ending of Strings startsWith endsWith
08:25
41
43 - Comparing Strings for Equality contentEquals
15:06
42
44 - JDK 21 String Templates
11:05
43
46 - Intro to Regular Expressions
02:24
44
47 - ABCs of Regular Expressions Part One
13:09
45
48 - ABCs of Regular Expressions Part Two
34:24
46
49 - Capture Groups Part One
25:28
47
50 - Capture Groups Part Two
12:58
48
51 - Named Capture Groups
13:04
49
52 - Comments in Regular Expressions
11:26
50
53 - Wrapping Up Phone Number Parsing
06:44
51
54 - Additional Character Classes
19:54
52
55 - Parsing a Real Text Document
40:14
53
56 - Greedy Operators
15:32
54
57 - Finding Multiple Matches
16:07
55
60 - Bits and Bytes
09:05
56
61 - Hexadecimal Numbers
09:33
57
62 - Numeric Data Types
17:26
58
63 - Bigger Numbers
11:33
59
64 - Floating Point Numbers
19:41
60
66 - Simple Math Operations
37:27
61
67 - Standard Math Functions
17:36
62
68 - More on Random Numbers
07:02
63
69 - Coding Exercise Calculating the Area of a Circle
06:05
64
70 - Coding Exercise Calculating Centripetal Force
21:50
65
71 - Comparing Numbers
05:52
66
72 - Introducing BigDecimal
09:10
67
73 - Using BigDecimal
12:31
68
74 - More on BigDecimal BigInteger
11:59
69
76 - Formatting Numbers
19:48
70
77 - Customizing Number Formatters
13:04
71
79 - Numeric Wrapper Classes
24:42
72
81 - Intro to Control Flow
06:01
73
82 - Conditionals with IfElse
27:21
74
83 - Control Flow Inequalities
07:51
75
84 - The Switch Statement
19:42
76
85 - Switch Statement New Features
22:39
77
86 - While Loops Part One
26:46
78
87 - Switch Statement Pattern Matching in JDK 21
14:58
79
88 - Legacy Lesson see JDK 21 version Switch Statement Pattern Matching JDK 17
11:17
80
89 - While Loops Part Two
22:04
81
90 - DoWhile Loops Part One
32:15
82
91 - DoWhile Loops Part Two
23:35
83
92 - For Loops
26:19
84
93 - A Simpler For Loop
09:40
85
94 - The Enhanced For Loop
04:40
86
95 - Applying Loops to Regex
06:21
87
97 - Intro to Testing
02:54
88
98 - Setting Up
18:59
89
99 - Our First Test
28:36
90
100 - Writing the Second Test
23:33
91
101 - Testing Edge Cases
12:19
92
102 - Testing Annuity Calculation
19:22
93
103 - Reimplementing the Guessing Game with TDD
19:51
94
104 - Guessing Game TDD Part Two
37:23
95
105 - Implementing Randomness
19:51
96
106 - Testing for Randomness A Deeper Explanation
25:26
97
107 - Tracking the Number of Guesses
34:40
98
108 - Handling More than Four Guesses
11:39
99
109 - Wrapping up Testing
24:58
100
110 - Reimplementing the Guessing Game User Interface
13:21
101
111 - Debugging Code Part One
35:46
102
112 - Debugging Code Part Two
17:05
103
114 - Intro
01:32
104
115 - Enums
31:01
105
116 - Enum Ordinals
22:00
106
117 - Enum Methods
20:57
107
118 - Enum Fields
22:39
108
119 - Enum ValueOf
12:22
109
120 - The this Keyword
12:54
110
121 - Setup for More Advanced OOP Topics
13:18
111
122 - Employee Salaries Continued
29:02
112
123 - Completing Other Employee Cases
24:28
113
124 - Introducing a Programmer Class
34:12
114
125 - Implementing the Other Employee Classes
26:24
115
126 - Introducing Interfaces
29:30
116
127 - Revisiting Class Hierarchies
20:55
117
128 - Completing the Employee Class Hierarchy
19:03
118
129 - Dealing with the Null Case
07:35
119
130 - Introducing Abstract Classes
22:17
120
131 - Factory Methods
27:38
121
132 - Nested Classes
09:49
122
133 - Other Types of Nested Classes
17:44
123
134 - Records
20:36
124
135 - Lambdas Versus Anonymous Classes
18:43
125
136 - Composition Versus Inheritance
24:54
126
137 - Default Methods
22:00
127
138 - Comparing Classes with instanceof
19:23
128
139 - Unnamed Patterns
11:53
129
140 - OOP Recap
20:47
130
142 - Solutions Explanations to Exercises 81
36:12
131
143 - Solutions Explanations to Exercises 82 83
42:05
132
144 - Solutions Explanations to Exercises 84 89
20:39
133
145 - Solutions Explanations to Exercises 810 819
20:05
134
146 - Solutions Explanations to Exercises 820 822
20:50
135
147 - Intro to Collections
04:52
136
148 - List Basics
22:28
137
149 - Linked Lists
26:52
138
150 - Looping with Iterators
20:33
139
151 - Loose Ends of Lists
07:22
140
152 - Additional List Methods
27:03
141
153 - Listcontains Objectequals
43:51
142
154 - Implementing Comparator to Sort Lists
31:05
143
155 - Implementing Comparable to Sort Lists
38:11
144
156 - Intro to Sets
19:54
145
157 - Sets Hashcode
22:46
146
158 - LinkedHashSet
12:34
147
159 - TreeSet
25:41
148
160 - Intro to Maps
04:12
149
161 - A Map Scenario
25:43
150
162 - Using Map Implementations
29:47
151
163 - Additional Map Methods
24:50
152
164 - JDK 21 Collections Changes
08:07
153
165 - Wrapping Up
03:56
154
167 - Intro to Streams Lambdas
01:48
155
168 - First Steps into Streams API
22:17
156
169 - Streams Explained
11:10
157
170 - Creating Streams
42:41
158
171 - Summing with Streams
28:58
159
172 - Sorting with Streams
25:10
160
173 - Filtering with Streams
24:10
161
174 - Additional Filtering Techniques
20:43
162
175 - Flattening Streams of Streams
31:35
163
176 - Alternatives to Filter
30:09
164
177 - The Map Reduce Pattern
45:33
165
178 - Intro to More Advanced Streams
23:46
166
179 - Big Data Summing
46:07
167
180 - Domain Models with Streams API
18:50
168
181 - Grouping Records
24:16
169
182 - Summing by Groups
22:19
170
183 - Nested Groupings
29:01
171
184 - Reducing with Collect
18:13
172
185 - Partitioning vs Grouping
12:57
173
186 - Functional Interfaces
11:46
174
187 - Functional Methods of Collections
38:30
175
189 - Exceptions
36:20
176
190 - Checked Exceptions
19:10
177
191 - Generics Part One
30:20
178
192 - Generics Part Two
34:28
179
193 - Optionals Part One
31:02
180
194 - Optionals Part Two
42:24
181
195 - Dates Times Intro
28:46
182
196 - Dates Times Periods Durations
08:03
183
197 - Dates Times Time Zones
15:44
184
198 - Dates Times Parsing Formatting
31:43
185
199 - Dates Times Temporal Adjustors Immutability
13:00
186
200 - Getting Started with Databases
12:26
187
201 - Installing DBeaver SQL Client
09:17
188
202 - Installing Squirrel SQL Client
14:54
189
203 - Lets Learn Some SQL
20:43
190
204 - Creating Retrieving Records
20:55
191
205 - Database Functions
12:29
192
206 - The UD in CRUD
12:47
193
207 - Creating a New Database Project
29:13
194
208 - TDD for Saving a Person
19:22
195
209 - Writing the JDBC Code to Save a Person
28:58
196
210 - Tidying Up Explaining Our Save Code
37:33
197
211 - Creating a Custom Save Exception
08:32
198
212 - Finding a Person By ID
41:33
199
213 - FindById A Negative Case
10:59
200
214 - Deleting a Person
09:44
201
215 - Deleting Multiple People at Once
18:50
202
216 - Updating a Person
34:26
203
217 - Creating a Reusable CRUD Repository
21:15
204
218 - CRUD Repository FindById
09:34
205
219 - CRUD Repository Completing the Remaining Methods
22:53
206
220 - CRUD Repository Implementing a Custom Annotation
31:42
207
221 - CRUD Repository Allowing Multiple SQL Annotations
38:33
208
222 - CRUD Repository Custom ID Annotation
28:54
209
223 - Loading Five Million People with PeopleRepository
32:31
210
224 - Speeding up the Queries with Indexes
22:51
211
225 - Creating an Address Table
30:24
212
226 - Saving One Address
39:40
213
227 - Saving a Person without an Address
20:01
214
228 - Fetching a Person with Their Address
20:09
215
229 - Fetching Address in One Go with Join Queries
29:00
216
230 - Joins with Missing Addresses
40:03
217
231 - Adding a Second Address Field
41:30
218
232 - Brief Word of Encouragement
04:15
219
233 - Challenge Adding a Spouse
04:38
220
234 - Adding Children
28:54
221
235 - Fetching Children in One Join
21:25
222
236 - Writing Code to Fetch Children in One Join
32:41
223
237 - Troubleshooting Techniques for Broken Tests
17:01
224
238 - Fixing FindAll for JoinFetched Child Code
29:05
225
239 - Join Tables
13:57
226
240 - Optimizing with Caching
27:12
227
241 - Optimizing Prepared Statements
17:36
228
242 - Conclusion
34:33
229
243 - Introduction
09:33
230
244 - Creating the PeopleDBWeb Project
14:51
231
245 - Implementing Web Hello World
09:06
232
246 - Web HTTP Basics
22:05
233
247 - Displaying a Simple List of People
22:53
234
248 - Introducing a Bootstrap Table for People
25:20
235
249 - Formatting Dates Salaries
30:03
236
250 - Introducing Spring Data
44:03
237
251 - Saving People
42:17
238
252 - UI Database Tweaks
31:16
239
253 - Validating Data
29:52
240
254 - Deleting People
27:27
241
255 - Updating People
37:59
242
256 - Internationalization
40:00
243
257 - Uploading a File
33:13
244
258 - Saving Uploaded Files
38:14
245
259 - Retrieving Uploaded Files
35:23
246
260 - Handling Exceptions in UI
35:11
247
261 - Introducing a Service Layer for Coordination Logic
28:44
248
262 - Coordinating Deletes with a Service
18:16
249
263 - Custom Query Methods
17:21
250
264 - Pagination
39:02
251
265 - Importing a CSV File
37:44
252
266 - Fixing Deletes UI Loose Ends
26:19
253
267 - Items Not Covered Thoroughly
35:12
254
268 - Where to Go from Here
32:08
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Frequently asked questions

What prerequisites are needed to enroll in the course?
The course is designed for absolute beginners in programming, so no prior experience is required. However, having a basic understanding of how to use a computer and navigate the internet will be beneficial. The course provides step-by-step guidance on installing necessary tools like JDK 21 and IntelliJ IDE, making it accessible even for those new to programming.
What kinds of projects or skills will I build during the course?
Students will develop a range of projects and skills, including creating simple applications like a 'Hello World' program, working with object-oriented programming concepts, and handling data with collections and arrays. You'll also learn advanced topics like Regular Expressions, Java Streams/Lambdas API, and working with SQL and JDBC for database interactions.
Who is the target audience for this course?
The course is aimed at individuals who want to start a career as professional developers and are new to programming. It's suitable for those who prefer learning Java at a slower pace and for experienced developers looking to deepen their understanding of advanced topics like Regex, Streams, and Optionals, which are often not well understood.
How does the depth of this course compare to other similar courses?
This course offers a comprehensive exploration of Java basics and advanced topics, with sections on Regex, Streams, and JDBC covering more than many individual courses on these subjects. It emphasizes practical skills over academic theory, providing real-world Java skills needed for a successful start in a developer career.
What specific tools and platforms will I learn to use in the course?
You will learn to install and use JDK 21 and the IntelliJ IDE, which are essential tools for Java development. The course covers installation on both MacOS and Windows, using tools like SDKMan, Homebrew, and Chocolatey. These are critical for setting up a development environment for Java programming.
What topics are not covered in this course?
The course does not cover topics unrelated to Java programming, such as frontend web development, mobile app development, or advanced frameworks like Spring. It focuses exclusively on Java language fundamentals, object-oriented programming, and some advanced topics like Streams and JDBC.
How much time should I expect to commit to this course?
While the total runtime of the course is not specified, it consists of 254 lessons. The pace is slower to accommodate beginners, so students should expect to dedicate a significant amount of time to fully engage with the material and complete coding exercises. The course allows for flexible learning, as you can adjust the playback speed and skip familiar content.