Java Essentials

Discover the unique features of Java and understand why it's a recommended programming language to learn. Write your first Java code and explore how to print text to the console.

Learn the basics of programming, dive into primitive data types, and explore operations with them. Write code that performs mathematical tasks and evaluates conditions for seamless execution.

Explore various loops such as for, while, and do-while, which are essential in any programming language. Loops enable efficient iteration over large datasets, saving significant time. Apply them extensively in tasks like sorting, working with arrays, collections, and more.

Learn how to effectively use arrays in Java programming by discovering how to group data into arrays and exploring common methods and properties for working with them. Techniques for manipulating and optimizing arrays in real-world applications will also be examined.

Learn about String, a crucial data type in Java, and discover its many built-in methods and operations. Explore String and StringBuilder, understanding their basic methods and how to use strings effectively in Java.

I de følgende lektioner vil du blive fortrolig med de indre mekanismer i Java og opdage optimerede metoder til at arbejde med sproget. Dette indebærer at udforske Javas operationer på computerniveau og anvende bedste praksis for effektiv udnyttelse af velkendte begreber.

Du har allerede stødt på metoder, og nu vil du endelig forstå, hvad de faktisk er, hvordan du opretter dine egne metoder, og hvordan du arbejder med dem. Du vil lære at returnere de ønskede værdier fra metoder og markant forbedre kvaliteten og logikken i din kode.

Gør dig klar til at dykke ned i String og udforske dens indre funktioner og metoder. Vi undersøger de interessante egenskaber, som String tilbyder, herunder muligheden for at tilpasse "toString"-metoden, opdele strenge i understrenge og anvende indekser for effektiv datahentning. Lad os udvide vores viden om strengmanipulation!

I dette afsnit lærer du, hvordan du opretter dine egne klasser og deres objekter. Du vil kunne anvende metoder fra én klasse i en anden og etablere relationer mellem dem. Gør dig klar til at opdage mange interessante begreber og fordybe dig yderligere i OOP-programmering!

I dette afsnit fortsætter vi vores undersøgelse af klasser. Vi vil udforske mere avanceret brug af klasseobjekter og lære mere om adgangsmodifikatorer og hvordan de bruges effektivt. Vi vil også gå i dybden med getters og setters, da de betragtes som bedste praksis inden for programmering.

Endelig kan vi begynde at lære objektorienteret programmering (OOP) i Java. Det vil være udfordrende, men jeg er sikker på, at du vil få succes! I dette afsnit gennemgår vi alle principperne for OOP og forklarer, hvorfor OOP er vigtigt. Du lærer, hvordan man arver klasser, overbelaster og overskriver metoder, indkapsler data fra andre klasser og arbejder med abstraktion. Derudover styrker du alle disse teoretiske begreber med praktiske øvelser og arbejder med opgaver i dit IDE. Du opnår en omfattende viden, både praktisk og teoretisk, så lad os komme i gang!

I det foregående afsnit konkluderede vi, at al Objektorienteret Programmering hovedsageligt er baseret på abstraktion. En abstrakt klasse har dog én væsentlig begrænsning – du kan kun arve fra én abstrakt klasse. Men hvad hvis vi har brug for mere? Her kommer interfaces ind i billedet. I dette afsnit vil du lære, hvad et interface er, hvorfor det er nødvendigt, hvordan det bruges korrekt, og du vil fortsætte med at øve Objektorienteret Programmering. Lad os gøre dig til en professionel!

Discover the concept of lists and explore the most commonly used types in Java. Learn how to create, modify, and manage lists efficiently. Understand their internal structure and discover when to use ArrayList vs. LinkedList based on performance. Implement your own singly linked list and reinforce key concepts through practical coding challenges.

Learn about data structures that are not as commonly used but are still valuable. Data structures like Set, Stack, Queue, and Deque will help you better understand how Java works and their various applications in databases.

Learn about key-value pair-based data retrieval, enabling the creation of structures similar to databases. Discovery of concepts like hashcode and exploration of data structures such as HashMap and HashSet are also included.

Learn to use enum for defining a fixed set of constants and explore the Stream API to process, filter, and transform data efficiently.

Let's talk about types of testing and which testing methods developers use. You will learn about the stages an application goes through before being delivered to the client and the specific tests you will need to write.

In this section, we're going to dive into unit testing — you'll get the rundown on its structure in Java and the ins and outs of crafting them the right way. Setting up your IDE, importing necessary libraries, and lots of hands-on practice.

In this section, we will enhance our coding skills by dealing with errors that can also be caught in unit tests. When testing an application, you may come across various errors, and sometimes they should be turned into exceptions. I will explain how to catch exceptions in your code, test them, and handle them properly.

This section will delve into the foundational concepts of multithreading in Java, focusing on the creation and management of threads, and the use of synchronization techniques to avoid conflicts. You’ll also learn how to utilize essential keywords and methods to ensure the accurate and reliable execution of multithreaded programs, providing a solid understanding of how to handle concurrency effectively in your applications.

This section explores synchronized collections in Java, explaining their purpose and the common concurrency issues they are designed to solve. You’ll gain insights into how these collections work, why they are essential in multithreaded environments, and how they help ensure safe and consistent data manipulation when multiple threads access shared resources.

This section covers high-level synchronization mechanisms in Java, such as the use of Lock and Condition, semaphores, barriers, atomic variables, and thread pooling with Executors. Each topic is paired with practical exercises designed to reinforce your understanding and help you apply the theoretical knowledge to real-world scenarios.

This section explores fundamental multithreaded programming patterns and practices such as Producer-Consumer, Fork/Join, ThreadLocal, and asynchronous programming with CompletableFuture. You'll work through examples and see the practical outcomes of these approaches, gaining hands-on experience that will enable you to apply these techniques effectively in real-world applications.

Discover how Stream API revolutionizes data processing in Java with its expressive and functional approach. Explore its architecture, principles, and key functional features to write concise and efficient code.

Learn about various intermediate operations available in the Stream API that allow you to manipulate and process data in a functional style. These operations, such as filtering, transforming, and sorting, enable you to efficiently work with collections and perform tasks like removing duplicates, limiting results, or handling nested structures. Each operation can be combined to create powerful data pipelines, making your code more concise and readable.

Learn about various terminal operations available in the Stream API that allow you to process and retrieve data efficiently. These operations, such as collecting, reducing, and counting, enable you to aggregate results, find specific elements, or perform side effects like printing or writing to a file. Understanding these operations helps you efficiently handle data processing tasks while keeping your code concise and expressive.

Discover how to apply Stream API in real-world scenarios, improving code readability and efficiency. Learn how to refactor existing code, analyze performance trade-offs, and handle exceptions properly. Will help you write cleaner and more maintainable Java code using Stream API.