Oracle Java SE 21 Developer Professional: 1Z0-830 from Udemy

What's inside

Learning objectives

Master handling primitives, wrapper classes, and type conversions in java
Evaluate and apply arithmetic and boolean expressions with precedence rules
Effectively manipulate text using string, stringbuilder, and text blocks
Work with java date-time api to handle date, time, period, and timezone objects
Create and manage control flow constructs like if/else, switch, and loops
Implement advanced object-oriented concepts, including encapsulation and inheritance
Create classes, records, and instantiate fields, methods, and constructors
Apply polymorphism, method overriding, and the instanceof operator with pattern matching
Work with java interfaces, functional methods, and enums effectively
Handle exceptions using try/catch/finally, try-with-resources, and multi-catch blocks
Create and manipulate arrays and java collections like list, set, map, and deque

Process data using streams and lambda expressions for filtering, transforming, and sorting
Perform advanced operations on streams like decomposition, reduction, and grouping
Understand modular java, compile code, and create modular/non-modular jars
Manage concurrent code execution with threads, executorservice, and parallel streams
Develop thread-safe code with locking mechanisms and concurrent apis
Use java i/o api for reading/writing files and serializing/deserializing objects
Implement localization using resource bundles and locale-specific parsing/formatting
Understand additional java features, including annotations and the java logging api
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Master handling primitives, wrapper classes, and type conversions in java
Evaluate and apply arithmetic and boolean expressions with precedence rules
Effectively manipulate text using string, stringbuilder, and text blocks
Work with java date-time api to handle date, time, period, and timezone objects
Create and manage control flow constructs like if/else, switch, and loops
Implement advanced object-oriented concepts, including encapsulation and inheritance
Create classes, records, and instantiate fields, methods, and constructors
Apply polymorphism, method overriding, and the instanceof operator with pattern matching
Work with java interfaces, functional methods, and enums effectively
Handle exceptions using try/catch/finally, try-with-resources, and multi-catch blocks
Create and manipulate arrays and java collections like list, set, map, and deque
Process data using streams and lambda expressions for filtering, transforming, and sorting
Perform advanced operations on streams like decomposition, reduction, and grouping
Understand modular java, compile code, and create modular/non-modular jars
Manage concurrent code execution with threads, executorservice, and parallel streams
Develop thread-safe code with locking mechanisms and concurrent apis
Use java i/o api for reading/writing files and serializing/deserializing objects
Implement localization using resource bundles and locale-specific parsing/formatting
Understand additional java features, including annotations and the java logging api
Show more
Show less

Syllabus

Introduction

From this lecture you will learn:
• How to communicate during this course

• Where to ask questions

• How to ask questions

• Communication channels

From this lecture you will learn:

• Where to find good tests to verify your knowledge

• How to get unlimited access to Learn IT application (only for my students from Udemy)

From this lecture you will learn:

• Java History

• Why Java

• What you can implement with Java

• This training course structure

• Opportunities after this course

• What is JVM

• What is JRE

• What is JDK

From this lecture you will learn:

• How to chose JDK version

• Difference between openjdk and oraclejdk

• How to install jdk on computer

• How to configure environment variables

From this lecture you will learn:

• What are console applications

• How to compile .java files to bytecode

• Basic Syntax

• How to create ‘Hello World’ app on Java

• What are compilation errors

• How to execute our programs on JVM

In the lesson we will solve homework together with and we will write batch script from scratch to compile your source code and run Hello World application.

From this lecture you will learn:

• What is IDE

• What are the most popular IDE for Java development

• Eclipse for Java EE developers: Overview

• Eclipse Java Project

• What is a package

From this lecture you will learn:

• What are comments

• What are types of comments in Java source code

• Java Doc

• Tips and best practices

The Quiz covers content from the following lessons:

What is Java and JDK
JDK Installation
First application: Hello World App
Integrated Development Environment, Eclipse Overview
Comments in Java Source Code

From this lecture you will learn:

• What data types exists in Java

• What are primitive types

• Integers

• Floating-point numbers

• Characters

• Boolean

• Primitive types conversion

• What are variables

• 'var' variables

• Java keywords

From this lecture you will learn:

• Number Systems

• Binary number system

• Octal number system

• Hexadecimal number system

• How to convert from one system to another

• Binary, octal and hexadecimal literals in Java

From this lecture you will learn:

• Arrays: overview

• One-dimensional arrays

• How to access elements in arrays

• Default values for elements in array

• ArrayIndexOutOfBoundsException

• Array literal

• Multidimensional arrays

•‘ null’ values

• java.util.Arrays

• import statement

• How to investigate JDK source code

The Quiz covers content from the following lessons:

Primitive types and variables
Number Systems
Arrays

From this lecture you will learn:

- how to create packages in eclipse

- how to configure package presentation in eclipse

- what is flat and hierarchical package presentation

- how to create nested packages

- how to create package during class creation

From this lecture you will learn:

- What are eclipse plugins?

- How to install free plugins?

- Eclipse marketplace

- How to change style of the workspace

From this lecture you will learn:

• How to rename multiple items at once

• Code formatting

• Configure formatting rules

• Extract variable from expression

• Extract method from multiple statements

• Import optimization

From this lecture you will learn:

• What are operators?

• Type of operators

• Arithmetic operators

• Assignment operators

• Relational operators

• Logical operators

• Bitwise operators

• Ternary operator

• Operator precedence

From this lecture you will learn:

• Dividing of integers specifics

• Subtraction of floating-point numbers specifics

• BigDecimal type

• How to control precision of arithmetic operations

From this lecture you will learn:

• java.lang.Math class overview

• How to perform basic mathematical operations

• Rounding

• Random number generation

• NaN - what is not a number?

• Infinity - what is 'infinity'?

• How to find max and min value?

• How to find square root?

From this lecture you will learn:

• What is expression

• What is statement

• Type of the expression in Java

• Concatenation with String

From this lecture you will learn:

• How to compare primitives

• How to compare reference types

• Java Memory Model: Heap and Stack in Java

• Integer pool

• equals() method

• How to compare arrays

From this lecture you will learn:

• How you can read input from the console

• What is System.in

From this lecture you will learn:

• How to run programs with arguments

• Project Explorer VS Navigator view in Eclipse

• How to run JVM with arguments

• How to set up maximum heap size for JVM

• Solutions for coding exercises

The Quiz covers content from the following lessons:

Operators in Java
Operations with integers and floating-point numbers, BigDecimal type
Math class, NaN, Infinity
Type of the expression in Java
Compare primitive and reference types & Java Memory Model
Read user input from console

From this lecture you will learn:

• java.lang.String class overview

• Main String methods

• How to create String objects

From this lecture you will learn:

• String pool

• String comparison

From this lecture you will learn:

• What are escape sequences?

• What escape sequences are available in Java?

• Unicode characters escaping

From this lecture you will learn:

• How to format string

• What are format specifiers?

• How to use Formatter?

• When need to format strings?

From this lecture you will learn:

• What are regular expressions?

• When to use regular expressions?

• Why we need regular expressions?

• How to write regular expressions in Java?

• Pattern and Matcher objects in Java

• How to find words in String

In this lesson you will see one of the way to solve home tasks. Best practices will be shared. POSIX groups will be discussed.

The Quiz covers content from the following lessons:

String: object creation and main methods overview
String comparison: How to compare Strings and what is String Pool
Escape Sequences in Java
String Formatting
Regular expressions in Java

From this lecture you will learn:

• How to use 'if' statement

• Syntax of 'if' statement

• Nested 'if' statements

• 'if-else-if' ladder

In this lesson you will find solution for coding exercises from 'if' statement topic

From this lecture you will learn:

• How to use 'switch' statement

• Syntax of 'switch' statement

• Type of expression to be used in 'switch'

• 'break' statement

• 'default' statement

• 'switch' vs 'if statement

In this lesson you will find solution for 'swtich' statement homework.

The Quiz covers content from the following lessons:

‘if-else’ construction
‘switch’ construction

From this lecture you will learn:

• How to generate random numbers?

• What is java.util.Random type?

• API of java.util.Random

• How to generate random numbers in specific range of values

From this lecture you will learn:

• What are iteration statements in Java?

• When we need to use iteration statements in Java

• Examples of loops in Java

• 'while' loop

From this lecture you will learn:

• How to use 'do-while' loop

• Usage of ´do-while´ loop - examples

• When to use 'do-while' over 'while' loop

From this lecture you will learn:

• How to use 'for' with condition loop

• Examples of the use

• Comma in for loop

From this lecture you will learn:

• How to use 'for each' loop

• Examples of the use

• Shortcut in eclipse to create 'for each' loop

From this lecture you will learn:

• How you can put one loop inside another one

• When you need to use nested loops

From this lecture you will learn:

• What are jump statements

• Continues statement

• Break statement

From this lecture you will learn:

• What is goto statement in programming?

• Labels in Java

• How to use labels in Java

In this lesson we will review solution for coding exercises.

The Quiz covers content from the following lessons:

'while' loop
'do-while' loop
'for' with condition loop
'for each' loop
Nested loops
Jump Statements - Break and Continue
Labels in Java

From this lecture you will learn:

• What is a method

• Method signature

• How to declare methods

• How to call methods

• Method overloading

• Pass arguments by value

• Recursive methods

• Variable-length arguments

From this lecture you will learn:

• Passing data by value

• Passing data by reference

• Passing primitive types to method in Java

• Passing reference types to method in Java

From this lecture you will learn:

• What is recursion

• What are recursive methods

• How to write recursive methods

• When do we need recursive methods

• Pros and cons of recursive methods

From this lecture you will learn:

• What are variable-length arguments

• Syntax of varargs

• Varargs in the methods

In this video we will review coding exercises from this section

From this lecture you will learn:

• What is Enum type

• How to declare Enum type

• How to initialize Enum variables

• How to compare Enum types

• Iteration over Enum constants

• Custom properties of Enum

• Custom methods of Enum

From this lecture you will learn:

• What is a debugger

• Why do we need to debug our programs

• How to debug java program in Eclipse

• How to analyze program execution

• How to adjust program execution in debug mode if needed

• What are breakpoints

From this lecture you will learn:

• What is OOP

• What is an object

• Class

• Why do we need OOP

• OOP advantages

• OOP VS Functional programming

• Inheritance

• Encapsulation

• Polymorphism

• Abstraction

From this lecture you will learn:

• What does class consist of

• Fields

• Initialization blocks

• Constructors

• Methods

• Nested classes

• Getters and setters

• toString() method

• How to create object

From this lecture you will learn:

• Concrete classes

• Nested classes

• Final classes

• POJO classes

• Abstract classes

• Anonymous classes

• Abstract keyword

From this lecture you will learn:

• What are interfaces

• What does interface consist of

• Abstract class VS Interface

• Interface VS Class VS Type

From this lecture you will learn:

• What is inheritance

• ‘super’ keyword

• ‘instanceof’ operator

• How to extend classes

• Inheritance rules

From this lecture you will learn:

• What is polymorphism

• Method overriding

• Override VS Overload

• Dynamic binding

• ‘final’ keyword

From this lecture you will learn:

• What is ‘static’ keyword

• Where we can use ‘static’ keyword

• Static methods

• Static fields

• Static import

• Static VS dynamic binding

From this lecture you will learn:

• What is encapsulation

• Access modifiers

• Which modifiers to use and when

• Rules during overriding

Traffic lights

Read about what's good

what should give you pause

and possible dealbreakers

Prepares learners to master topics required for the Oracle 1Z0-830 certification, which can help them tackle the certification exam with confidence

Covers a wide range of programming concepts, from object-oriented principles to modular applications, which are essential for modern Java development

Explores primitives and wrapper classes, which are fundamental concepts for understanding data types and their manipulation in Java

Uses Java SE 21, the latest long-term support version, which ensures learners are up-to-date with current industry standards and practices

Requires installing JDK and configuring environment variables, which may pose a challenge for learners who are completely new to Java development

Teaches Eclipse, which is a popular IDE, but learners may need to invest time in learning its features and configurations for optimal use

Reviews summary

Solid java se 21 certification preparation

According to learners, this course is a highly effective resource for preparing for the Oracle 1Z0-830 Java SE 21 Developer Professional certification exam. Students say the course content is comprehensive, covering the wide range of topics required by the exam syllabus, and the instructor's explanations are clear and easy to follow. The included practice quizzes and exercises are often mentioned as helpful tools for reinforcing learning and testing understanding. However, some reviewers note that the course is best suited for those with existing Java fundamentals, suggesting it may move too quickly or assume too much prior knowledge for absolute beginners. Overall, it is regarded as a solid pathway towards certification.

Instructor is expert and easy to follow.

"The instructor is very knowledgeable about the subject matter."

"His teaching style is engaging and kept me interested."

"I enjoyed the instructor's delivery and expertise throughout the lessons."

Covers features relevant to Java SE 21.

"The material is current and relevant for the Java 21 certification."

"Glad to see it covers the latest SE 21 features required for the exam."

"Content is up-to-date which is crucial for a certification based on a specific version."

Provides practical exercises and quizzes.

"The quizzes after each section really helped reinforce the learning."

"Coding exercises were practical and helped me apply what I learned."

"Found the practice materials beneficial for testing my understanding."

Explains complex Java concepts clearly.

"The explanations are very clear and easy to grasp, even for complex topics."

"Instructor did a fantastic job breaking down difficult subjects into understandable parts."

"I found the material easy to follow and understand thanks to the clear explanations provided."

Strong preparation for the 1Z0-830 certification.

"This course provided great preparation for the exam."

"I felt well prepared for the 1Z0-830 after taking this course."

"Highly recommend this course if you are aiming for the Oracle Java SE 21 certification; it covers everything needed."

Best suited for learners with some Java background.

"You definitely need to have some prior Java knowledge before starting this course."

"I wouldn't recommend this for absolute beginners; it moves pretty fast."

"It assumes you know the basics, so brush up on fundamentals if you're new."

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Oracle Java SE 21 Developer Professional: 1Z0-830 with these activities:

Review Core Java Concepts

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Strengthen your understanding of fundamental Java concepts before diving into advanced topics. This will help you grasp the more complex material covered in the course.

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Review basic syntax, data types, and control flow.
Practice writing simple Java programs.
Review object-oriented programming principles.

Review 'Effective Java' by Joshua Bloch

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Gain a deeper understanding of Java best practices and design patterns. This will improve your ability to write high-quality, maintainable code.

View Effective Java (3rd Edition) on Amazon

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Read and understand the key principles outlined in the book.
Apply the recommendations to your own Java projects.

Create a Java Cheat Sheet

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Consolidate your knowledge of Java syntax and APIs by creating a cheat sheet. This will serve as a valuable reference tool for future projects.

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Gather essential Java syntax and API information.
Organize the information into a concise and easy-to-use format.
Review and refine the cheat sheet.

Four other activities

Expand to see all activities and additional details

Show all seven activities

Review 'Java Concurrency in Practice' by Goetz et al.

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Master Java concurrency concepts and techniques. This will enable you to write efficient and reliable multithreaded applications.

View Java Concurrency in Practice on Amazon

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Read and understand the core concepts of Java concurrency.
Study the examples and apply them to your own projects.

LeetCode Java Problems

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Sharpen your problem-solving skills and improve your understanding of data structures and algorithms in Java. This will help you tackle complex coding challenges.

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Solve a variety of LeetCode problems using Java.
Focus on problems related to data structures and algorithms.
Analyze and optimize your solutions.

Build a Concurrent Web Server

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Apply your knowledge of Java concurrency to build a practical application. This will solidify your understanding of threads, executors, and synchronization.

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Design the architecture of the web server.
Implement thread pooling and request handling.
Implement locking mechanisms to ensure thread safety.
Test and optimize the performance of the server.

Write a Blog Post on Java Modules

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Deepen your understanding of Java modules by explaining the concept to others. This will force you to organize your thoughts and clarify any remaining questions.

Show steps

Research Java modules and their benefits.
Write a clear and concise blog post explaining the concept.
Include examples of how to create and use Java modules.

Career center

Learners who complete Oracle Java SE 21 Developer Professional: 1Z0-830 will develop knowledge and skills that may be useful to these careers:

Java Developer

A Java Developer builds, tests, and maintains software applications using the Java programming language. This course is directly relevant to the work of a Java Developer, as it specifically focuses on the skills and knowledge required for modern Java development, including understanding core and advanced Java programming concepts. The comprehensive coverage of topics such as object-oriented programming, handling exceptions, and working with collections ensures that learners are well-prepared to tackle real-world coding challenges. This course provides a strong foundation in Java SE 21 features, making a learner a more capable and competitive Java Developer.

See salaries and explore the career path for Java Developer

Software Engineer

Software Engineers design, develop, and maintain software systems, and often use Java as a core language in their work. This course provides Software Engineers with a deep dive into the Java SE 21 platform, enhancing their ability to build modern enterprise applications. The course's broad curriculum, covering concurrency, I/O, and localization, helps one build a strong foundation. This course, with its comprehensive scope and focus on practical Java skills, strengthens a software engineer's technical capabilities, making them more proficient with Java.

See salaries and explore the career path for Software Engineer

Backend Developer

Backend Developers are responsible for the server-side logic and database interactions of an application, and Java is a popular choice for backend development. This course will help a Backend Developer by deepening their expertise in Java SE 21, helping them write efficient and scalable code. The course's focus on topics like Streams, lambda expressions, and concurrency is highly applicable in writing robust backend systems. Taking this course ensures a Backend Developer is proficient in modern Java practices.

See salaries and explore the career path for Backend Developer

Application Developer

Application Developers create and maintain software applications, often utilizing languages like Java. This course is highly useful for Application Developers because it provides a thorough understanding of Java SE 21, including object-oriented concepts, modularity, and concurrency. With the breadth of topics covered, an Application Developer can build Java applications more efficiently. This course gives an Application Developer the necessary expertise to write robust applications.

See salaries and explore the career path for Application Developer

Systems Programmer

Systems Programmers often work with low-level system operations which may involve coding in Java. This course would be suitable for someone pursuing this field, as it provides a deep dive into Java SE 21 and its inner workings. The course's focus on topics like I/O, concurrency, and module packaging assists a Systems Programmer in developing efficient and reliable code. This course will help a systems programmer build a deeper understanding of the Java platform.

See salaries and explore the career path for Systems Programmer

Web Developer

Web Developers often use Java for creating dynamic and robust web applications. Though this course is not specifically focused on web development, a strong understanding of Java SE 21 is valuable to the work of a Web Developer. This course provides developers with key concepts in object-oriented programming and concurrency, which are integral to building server-side applications. This course will help a web developer write more reliable and performant Java web applications.

See salaries and explore the career path for Web Developer

Mobile Application Developer

Mobile Application Developers use Java to build applications for the Android platform. Though this course does not focus specifically on Android, its deep dive into Java SE 21 will be valuable for Mobile Application Developers. A strong grounding in Java fundamentals, object-oriented concepts, and concurrency helps the mobile application developer write more efficient and robust code. This course helps build a strong foundation in Java, enabling the learner to create higher quality mobile applications.

See salaries and explore the career path for Mobile Application Developer

Embedded Systems Engineer

Embedded Systems Engineers design and develop software for embedded devices and may use Java to do so. While not specific to embedded systems, this course establishes a firm grasp of Java SE 21, which can be beneficial for this role. The course's in-depth exploration of topics like object-oriented concepts, concurrency, and I/O provides a foundation needed for embedded software development. An Embedded Systems Engineer may find these skills relevant to their work. This course will prove useful to someone who wishes to use Java in their work.

See salaries and explore the career path for Embedded Systems Engineer

Software Architect

Software Architects design the high-level structure of software systems and must have expert knowledge of different languages, including Java. This course may help a Software Architect by providing deep knowledge of Java SE 21 and its advanced features. Understanding concurrency, module packaging, and I/O facilitates the design of large and scalable systems. This course may be useful to a Software Architect who needs to make informed decisions about Java-based projects.

See salaries and explore the career path for Software Architect

Software Consultant

Software Consultants advise organizations on software development practices and technology choices. This course may help a Software Consultant by providing an updated and comprehensive understanding of Java SE 21. The course's coverage of modern Java features and best practices equips a consultant with the needed expertise. This course may be valuable to consultants looking to advise clients on the use of the Java platform.

See salaries and explore the career path for Software Consultant

DevOps Engineer

DevOps Engineers manage the infrastructure and tooling needed for software deployment, and may use Java as part of their work. This course may be useful for DevOps Engineers by providing a deeper understanding of Java SE 21. Topics such as packaging modular Java applications and working with the Java I/O API may help in certain DevOps tasks. This course may be relevant in the Java-related aspects of a DevOps Engineer's work.

See salaries and explore the career path for DevOps Engineer

Database Administrator

Database Administrators manage and maintain database systems. This role may require them to interact with Java applications. This course may be useful to a Database Administrator, as it deepens their understanding of Java, which could help them interact with Java-based systems. The course covers topics such as exception handling, which may be relevant in troubleshooting. This course may be useful in a Database Administrator's broader understanding of Java systems.

See salaries and explore the career path for Database Administrator

Technical Support Engineer

Technical Support Engineers provide technical assistance, and may need some familiarity with Java when dealing with customer issues. This course may be useful to Technical Support Engineers who need a basic understanding of Java applications. While the course is in-depth, the information on Java fundamentals, exceptions, and I/O may lend itself to a better understanding of Java. A Technical Support Engineer may find this course useful to assist with some Java-related issues.

See salaries and explore the career path for Technical Support Engineer

Quality Assurance Analyst

Quality Assurance Analysts often test software and must have a basic understanding of the technologies used. While this course is not focused on testing, a Quality Assurance Analyst may find it useful to understand the Java platform and its intricacies, as taught by this course. The coverage of core Java features may be useful when testing applications built with Java. This course may be helpful to Quality Assurance Analysts in their broader understanding of software.

See salaries and explore the career path for Quality Assurance Analyst

Project Manager

Project Managers oversee software development projects, and may benefit from some understanding of the technologies involved. While this course is not specifically targeted to project management, a Project Manager may find it helpful to develop a high-level understanding of the Java platform, as taught by this course. The course's comprehensive coverage of Java SE 21 offers a basis for discussing project requirements. This course may provide useful context to a software project manager.

See salaries and explore the career path for Project Manager

Oracle Java SE 21 Developer Professional

1Z0-830

What's inside

Learning objectives

Syllabus

Traffic lights

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Reviews summary

Solid java se 21 certification preparation

Activities

Career center

Reading list

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