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The JVM is installed on the host operating system (Windows, macOS, Linux, etc.) and is responsible for translating the platform-independent bytecode into native machine code that the specific hardware can understand and run.","The execution process within the JVM involves several components:","This multi-step process ensures that Java code remains portable and secure across diverse platforms, fulfilling its core promise of \"Write Once, Run Anywhere\".","Input: HelloWorld.java (source code)","Output: HelloWorld.class (bytecode file)","Class Loader: Loads the .class files into the JVM's memory.","Bytecode Verifier: Ensures the bytecode is valid and adheres to Java's security rules before execution.","Execution Engine: Executes the bytecode. Modern JVMs use a combination of an interpreter and a Just-In-Time (JIT) compiler:Interpreter: Initially interprets bytecode instruction by instruction.JIT Compiler: For frequently executed sections of code (\"hot spots\"), the JIT compiler compiles the bytecode into optimized native machine code at runtime. This cached native code runs much faster upon subsequent calls, significantly improving performance.","Interpreter: Initially interprets bytecode instruction by instruction.","JIT Compiler: For frequently executed sections of code (\"hot spots\"), the JIT compiler compiles the bytecode into optimized native machine code at runtime. This cached native code runs much faster upon subsequent calls, significantly improving performance.","Garbage Collector: Automatically manages memory by identifying and removing objects that are no longer in use, freeing up memory resources."]}],"references":[{"type":"ai_overview_reference","title":"How Java Works: Compilation, JVM, JRE, and JDK Explained","url":"https://medium.com/@yashbatra11111/how-java-works-compilation-jvm-jre-and-jdk-explained-d84e5971a867","domain":"Medium"},{"type":"ai_overview_reference","title":"How does Java work? - Tencent Cloud","url":"https://www.tencentcloud.com/techpedia/101694","domain":"Tencent Cloud"},{"type":"ai_overview_reference","title":"What is Java?—Beginner's Guide to Java | Microsoft Azure","url":"https://azure.microsoft.com/en-us/resources/cloud-computing-dictionary/what-is-java-programming-language","domain":"Microsoft Azure"}]},{"type":"organic","items":[{"type":"organic","url":"https://medium.com/nerd-for-tech/lets-understand-java-261b2e6bcf2e","title":"Let's Understand Java. 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It takes in a computer program and spits out a list of machine operations and parameters.Read moreHow and why is useful? : r/learnprogramming - Reddit93 postsOct 13, 2021What EXACTLY can you do with and how can I ...9 postsJan 30, 2018More results from www.reddit.com"},{"type":"organic","url":"https://azure.microsoft.com/en-us/resources/cloud-computing-dictionary/what-is-java-programming-language#:~:text=This%20is%20achieved%20with%20a,Java%20virtual%20machine%20(JVM).","title":"What is Java?—Beginner's Guide to Java | Microsoft AzureHow Java Works - Smart ProgrammingC++ vs Java: What Programming Language Should You Choose?3.5. Operators — AP CSA Java Review - Runestone Academy","text":"People also askHow does Java actually work?This is achieved with a piece of software called a compiler. A compiler takes high-level computer code like Java and translates it into a language that operating systems understand called bytecode. Bytecode is then processed by an interpreter called a Java virtual machine (JVM).Microsoft Azure › cloud-computing-dictionaryMicrosoft Azure › cloud-computing-dictionaryHow does Java work step by step?Smart Programming › tutorials › how-java-worksSmart Programming › tutorials › how-java-worksIs Java closer to C or C++?. However, the ecosystems of Java and C++ are very different. C++ code can be called into C, C++ libraries, or API of operating systems. On the other hand, Java code is only ideal for Java-based libraries.Feb 21, 2025Turing › blog › cpp-vs-java-which-prog...Turing › blog › cpp-vs-java-which-prog...What does '%' mean in Java?The percent sign operator ( % ) is the . The modulo operator ( x % y ) returns the remainder after you divide x (first number) by y (second number) so 5 % 2 will return 1 since 2 goes into 5 two times with a remainder of 1.Runestone Academy › apcsareview › VariableBasicsRunestone Academy › apcsareview › VariableBasicsFeedback"},{"type":"organic","url":"https://aws.amazon.com/what-is/java/","title":"What is Java? - Java Programming Language Explained","text":"Amazon Web Services › ... › Developer ToolsAmazon Web Services › ... › Developer ToolsAny Java file is first compiled into bytecode. . The JVM then interprets the bytecode to run it on the underlying hardware ...Read more"},{"type":"organic","url":"https://www.youtube.com/watch?v=NHrsLjhjmi4","title":"#4 How Java Works","text":"YouTube · TeluskoYouTube · Telusko12:035 key moments5 key moments in this video05:5907:1210:0810:2610:36YouTube·YouTube·Telusko·Jan 16, 2023"},{"type":"organic","url":"https://www.geeksforgeeks.org/java/introduction-to-java/","title":"Introduction to Java","text":"GeeksforGeeks › java › introduction-to-...GeeksforGeeks › java › introduction-to-... is a high-level, object-oriented programming language developed by Sun Microsystems in 1995. It is mostly used for building desktop applications, ...Read more"},{"type":"organic","url":"https://dev.to/arokoola_mayowa_4b95d61ed/how-java-works-a-complete-guide-1c29","title":"How Java Works: A Complete Guide","text":"DEV Community › how-java-works-a-complete-guide-1c29DEV Community › how-java-works-a-complete-guide-1c29 — Jul 12, 2025This guide walks you through the entire process from writing to execution, explaining the key components that make Java's “write once, run anywhere” ...Read more"},{"type":"organic","url":"https://www.cs.cornell.edu/courses/JavaAndDS/files/howJavaWorks.pdf","title":"How Java Works","text":"Cornell University › JavaAndDS › filesCornell University › JavaAndDS › filesPDFA Runtime Environment (JRE) is a software package that contains everything needed to execute a program. It includes the interpreter for bytecode ...Read more1 page"},{"type":"organic","url":"https://www.freecodecamp.org/news/understanding-java-internals-speed-and-performance/","title":"Understanding Java Internals: Speed and Performance","text":"freeCodeCamp › news › understanding-...freeCodeCamp › news › understanding-... — Sep 24, 2023 that is platform-independent and adopts the Object Oriented Programming structure to build software.Read moreWhat Is The Java Programming...Interpreted Vs Compiled...How Does Java Work?"},{"type":"organic","url":"https://www.scaler.com/topics/java/how-java-program-works/","title":"How Java Program Works?","text":"Scaler › topics › how-java-program-wo...Scaler › topics › how-java-program-wo...Java is an object oriented programming language. 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