The Java Virtual Machine (JVM) is a key component of the Java platform. It is responsible for running Java bytecode and provides a runtime environment for Java applications and libraries. The JRE (Java Runtime Environment) is a subset of the JVM that includes just the components necessary to run Java applications. This article explains the difference between the JVM and JRE, and how you can decide which one to use.
What is JVM?
JVM is a virtual machine that allows Java programs to run on any platform. JVM interprets Java bytecode into machine code and executes it. JVM provides a platform-independent environment for Java programs to run. JVMs are available for many hardware and software platforms (e.g. JVMs are available for Windows, Linux, and Mac). JVMs contain a set of core libraries that provide the functionality of the Java programming language. JVMs also have a set of default settings (e.g. memory management settings). JVMs can be customized with command-line options and environment variables. JVMs can be configured to use different garbage collectors, threading models, and compilers. The JVM specification is implemented by many vendors (e.g. Oracle, IBM, HP, etc.). JVM implementations are typically not interoperable (i.e. a program written for one JVM implementation will not run on another JVM implementation).
What is JRE?
JRE is a Java Runtime Environment. It is the software that enables JAVA applications to run on your computer. JRE consists of JVM and a set of libraries. JRE does not include development tools such as compilers and debuggers. Java applications are compiled into bytecode. The JRE provides the JVM, which interprets and executes the bytecode. JRE also provides class libraries, which gives the developers a ready-made environment for developing their applications. JRE providers also offer a set of tools for developers, which includes compilers, debuggers, etc. JRE is platform-independent and can be installed on any operating system that supports Java. JRE is available for free from the Oracle website. JRE is also bundled with JDK, which includes development tools such as compilers and debuggers. JDK is not free and has to be purchased from Oracle. JRE can be used to run any Java application, whereas JDK can be used to develop Java applications.
Difference between JVM and JRE
JVM (Java Virtual Machine) is an execution environment for Java applications. JRE (Java Runtime Environment) is a subset of JVM that contains only those components required to run Java applications. JVM provides a platform-independent way of executing code, while JRE provides the environment in which JVM runs. JRE includes the Java class libraries, the JVM, and other necessary files. JRE does not include developer tools such as compilers or debuggers. JVM is a part of JRE. JVM interprets the bytecode into machine code and executes it.
JRE is required to run Java applications on a computer. JVM is required to run Java programs on a computer. JRE can be used to create Java applications. JVM can be used to create Java programs, but it is not necessary. JRE is available for multiple platforms, including Windows, Linux, and Mac OS X. JVM is available for multiple platforms, including Windows, Linux, and Mac OS X. JRE is bundled with the JDK (Java Development Kit). The JDK includes the JRE, development tools such as compilers and debuggers, and other necessary files.
In conclusion, the Java Virtual Machine is software that allows you to run Java applications. The JRE is what you need in order to use the Java Virtual Machine. They are both important tools for developing and running Java applications.