What is the running environment of java program
The necessary environment for running Java programs is the Java Runtime Environment (JRE), which includes the Java Virtual Machine (JVM), core class libraries and Java APIs. It is responsible for executing bytecode, providing common classes and accessing system resources. .
The running environment of Java program
Java program needs to run in a specific environment, which is called Java runtime time environment (JRE).
Composition of JRE
JRE consists of the following components:
- Java Virtual Machine (JVM):Responsible Execute Java bytecode.
- Core class library: Provides common classes and methods required by Java applications.
- Java API: Allows Java applications to access system resources and services.
How JRE works
When you run a Java program, the JVM compiles the source code into bytecode. Bytecode is platform-independent code that can run on any computer with a JVM. The JVM loads and executes bytecode and interacts with core class libraries and APIs to complete tasks.
Installation of JRE
Running Java programs requires JRE to be installed on the computer. It is usually installed with the Java Development Kit (JDK), which is used to develop Java programs.
Alternatives
In addition to JRE, there are other environments that can run Java programs:
- Java Development Kit (JDK ): Includes the JRE, as well as additional tools needed to compile Java source code and develop Java applications.
- JIT Compiler: A compiler that improves the performance of Java applications by compiling bytecode into machine code.
- Java Native Interface (JNI): An interface that allows Java applications to interact with native code.
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