2024-06-25

What is Java Runtime Environment (JRE)?

What is JRE?

JRE is a piece of software that allows you to run other programs. The class libraries, loader class, and JVM are all included. To put it another way, JRE is required to run Java programmes. If you are not a coder, you only need JRE to run Java programmes and do not need to install JDK. However, because all JDK versions include the Java Runtime Environment, you won’t have to download and install the JRE separately on your computer. Java Runtime Environment is the full form of JRE.

Why required JRE?

The following are some of the most compelling reasons to use JRE:

•  JRE includes class libraries, a Java Virtual Machine, and other supporting resources. It does not include any Java development tools, such as a debugger or compiler.

•  It makes extensive use of package classes such as math, swing, and others, as well as util, lang, awt, and runtime libraries.

•  JRE must be installed on your system if you want to run Java applets.

Importance of JRE

The following are some of JRE’s key features:

•  The Java Runtime Environment (JRE) is a suite of tools that allows the JVM to run.

•  The Java Runtime Environment (JRE) includes deployment technology such as Java Web Start and Java Plug-in.

•  Developers can run source code in JRE with ease, but they cannot build or compile Java programmes.

•  It includes Java Database Connectivity (JDBC), Remote Method Invocation (RMI), Java Naming and Directory Interface (JNDI), and other integration libraries.

•  JRE has a JVM virtual machine client as well as a Java HotSpot virtual machine client.

How JRE Works?

JRE includes a JVM instance, as well as library classes and development tools. The compiler creates a class file with byte code after you write and compile Java code.

JRE  data flow diagram
JRE  data flow diagram

JRE includes a JVM instance, as well as library classes and development tools. The compiler creates a class file with byte code after you write and compile Java code.

The following are the key components of JRE:

•  Class loaders: A class loader is a programme that loads several classes that are required to run a Java programme. The bootstrap class loader, extensions class loader, and system class loader are the three class loaders used by JVM.

•  Byte code verifier: A bytecode verifier verifies the bytecode to ensure that it does not cause the interpreter to malfunction.

•  Interpreter: The interpreter reads the code line by line after the classes have been loaded and verified.

•  Run-time: Run-time is a term used mostly in programming to define the length of time that a programme is active.

•  Hardware: When Java native code is compiled, it runs on a specific hardware platform.

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