Java Programming - Các Khái Niệm Cơ Bản và Ứng Dụng

Java is a high-level, general-purpose, memory-safe, object-oriented programming language. It is intended to let programmers write once, run anywhere (WORA), meaning that compiled Java code can run on all platforms that support Java without the need to recompile. Java applications are usually compiled to bytecode that can run on any Java virtual machine (JVM) regardless of the underlying computer architecture. The syntax of Java is similar to C and C++, but has fewer low-level facilities than either of them. The Java runtime provides dynamic abilities (such as reflective programming (reflection) and runtime code modification) usually unavailable in traditional compiled languages.Java gained popularity shortly after its release, and has been a popular programming language since then. Java was the third most popular programming language in 2022 according to GitHub. Although still widely popular, there has been a gradual decline in use of Java in recent years with other languages using JVM gaining popularity.Java was designed by James Gosling at Sun Microsystems. It was released in May 1995 as a core component of Sun's Java platform. The original and reference implementation Java compilers, virtual machines (VMs), and class libraries were released by Sun under proprietary licenses. As of May 2007, in compliance with the specifications of the Java Community Process, Sun had relicensed most of its Java technologies under the GPL-2.0-only license. Oracle, which bought Sun in 2010, offers its own HotSpot Java virtual machine. However, the official reference implementation is the OpenJDK JVM, which is open-source software used by most developers and is the default JVM for almost all Linux distributions.Java 26 is the current version as of March 2026. Java 25 is long-term support (LTS) version still under maintenance by Oracle (as permissively licensed); Java 21 is also still an LTS version though users "wanting to continue with permissively licensed versions of Java after September of 2026 should upgrade to Oracle JDK 25 or later" according to Oracle. Oracle also provides proprietary "Java SE OTN license" for it (for longer) and Java 21 LTS, 11 LTS and 8 LTS. Note, Oracle still supports Java 8 LTS at no cost (but with a proprietary license) for personal use. Others also support same LTS versions (commercially), and latest, and some even down to Java 6 and 7 (to 2027 or March 2028 depending).

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Java (programming language) Java is a high-level, general-purpose, concurrent, class-based, object-oriented programming language designed for platform independence and simplicity, with its syntax...

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Java is one of the world's most widely used programming languages. Java is free to use, and runs on all platforms. Get certified with our Java exam, includes a professionally curated study kit to guide you from beginner to exam-ready.

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Apr 28, 2026 · Java is a high-level, object-oriented programming language used to build web apps, mobile applications, and enterprise software systems. Java is a platform-independent language, which means code written in Java can run on any device that supports the Java Virtual Machine (JVM).

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If you want to learn Java for free with a well-organized, step-by-step tutorial, you can use our free Java tutorials. Our tutorials will guide you through Java one step at a time, using practical examples to strengthen your foundation.

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Oct 25, 2024 · The Java Tutorials are practical guides for programmers who want to use the Java programming language to create applications. They include hundreds of complete, working examples, and dozens of lessons.

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This Java tutorial has been written for beginners to advanced programmers who are striving to learn Java programming. We have provided numerous practical examples to explain the concepts in simple and easy steps.

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Learn Java programming from the official tutorials and resources by Oracle. Explore the language features, APIs, tools, and best practices for developing Java applications.

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Learn important Java coding fundamentals and practice your new skills with real-world projects. Welcome to the world of Java programming! Java is a popular object-oriented programming language that is used in many different industries. Learn about datatypes in Java and how we use them.

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