Java Essensielt

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 leksjonene vil du bli kjent med de indre mekanismene i Java og oppdage optimaliserte metoder for å arbeide med språket. Dette innebærer å utforske Javas operasjoner på maskinnivå og å ta i bruk beste praksis for effektiv utnyttelse av kjente konsepter.

Du har allerede støtt på metoder, og nå vil du endelig forstå hva de faktisk er, hvordan du lager dine egne metoder, og hvordan du arbeider med dem. Du vil lære å returnere ønskede verdier fra metoder og forbedre kvaliteten og logikken i koden din betydelig.

Gjør deg klar til å fordype deg i String og oppdag mer om dens indre virkemåte og metoder. Vi utforsker de interessante egenskapene som String tilbyr, inkludert muligheten til å tilpasse "toString"-metoden, dele strenger opp i delstrenger og bruke indekser for effektiv datainnhenting. Bli med på denne spennende reisen for å utvide kunnskapen om strengmanipulering!

I denne delen vil du lære hvordan du oppretter egne klasser og deres objekter. Du vil kunne bruke metoder fra én klasse i en annen og etablere relasjoner mellom dem. Gjør deg klar til å oppdage mange interessante konsepter og fordype deg i OOP-programmering!

I denne delen fortsetter vi studiet av klasser. Vi vil utforske mer avansert bruk av klasseobjekter og lære mer om tilgangsmodifikatorer og hvordan disse brukes effektivt. Vi vil også gå nærmere inn på getters og setters, da disse anses som beste praksis innen programmering.

Endelig kan vi begynne å lære om objektorientert programmering (OOP) i Java. Det vil være utfordrende, men jeg er sikker på at du vil lykkes! I denne delen dekker vi alle prinsippene for OOP og forklarer hvorfor OOP er viktig. Du lærer hvordan du arver klasser, overbelaster og overskriver metoder, kapsler inn data fra andre klasser og arbeider med abstraksjon. Videre vil du styrke alle disse teoretiske konseptene med praktiske øvelser, der du jobber med oppgaver i ditt IDE. Du vil tilegne deg mye kunnskap, både praktisk og teoretisk, så la oss komme i gang!

I forrige seksjon konkluderte vi med at all objektorientert programmering hovedsakelig er bygget på abstraksjon. En abstrakt klasse har imidlertid én betydelig begrensning – du kan kun arve fra én abstrakt klasse. Men hva om vi trenger mer? Her kommer grensesnitt til unnsetning. I denne seksjonen vil du lære hva et grensesnitt er, hvorfor det er nødvendig, hvordan det brukes korrekt, og du vil fortsette å øve på objektorientert programmering. La oss gjøre deg til en profesjonell!

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.