Compilation in Java converts source code into bytecode for syntax and logic checking and to increase execution speed. Runs on the JVM to execute bytecode, including class loading, instance creation, method execution, and error handling. The main differences include: time (compilation is executed first, running is performed dynamically), output (compilation into bytecode, running as the result), error checking (compiling to detect syntax, running to detect runtime errors), dependencies (compilation depends on the compiler, Runtime dependent on JVM) and flexibility (bytecode is executable across JVMs).
The difference between compilation and running in Java
In Java, compilation and running are two completely different things Process is crucial to understanding how Java works.
Compilation
Compilation is a process of converting Java source code (.java file) into bytecode (.class file). Bytecode is a machine-readable set of instructions that can be executed on a Java Virtual Machine (JVM). Compilation is typically performed by the Java compiler (javac).
The main purpose of compilation is:
- Check for syntax errors and logical errors in the code.
- Convert Java code to faster bytecode format.
- Ensure that the bytecode is compatible with the standards specified by the JVM.
Running
Running is the process of executing bytecode instructions on the JVM. The JVM is responsible for interpreting the bytecode and executing the behavior it represents. Runtime is typically performed by the Java Runtime Environment (JRE).
The main purpose of running is:
- Dynamic loading of classes.
- Create class instance.
- Execution methods and constructors.
- Handling exceptions and errors.
Differences
The key differences between compiling and running are as follows:
- Time: Compile Usually executed once before the program is run, while execution occurs dynamically while the program is running.
- Output: Compilation produces bytecode files, and running produces actual behavior and results.
- Error checking: Compilation is mainly used to detect syntax errors, while running will detect runtime errors, such as null pointer exceptions.
- Dependencies: Compilation depends on the Java compiler, and running depends on the Java virtual machine.
- Flexibility: Bytecode can run on different JVMs, while Java code can only be compiled on a specific compiler version.
The above is the detailed content of The difference between compiling and running in java. For more information, please follow other related articles on the PHP Chinese website!

Discussion on the reasons why JavaScript cannot obtain user computer hardware information In daily programming, many developers will be curious about why JavaScript cannot be directly obtained...

RuoYi framework circular dependency problem troubleshooting and solving the problem of circular dependency when using RuoYi framework for development, we often encounter circular dependency problems, which often leads to the program...

About SpringCloudAlibaba microservices modular development using SpringCloud...

Questions about a curve integral This article will answer a curve integral question. The questioner had a question about the standard answer to a sample question...

In SpringBoot, use Redis to cache OAuth2Authorization object. In SpringBoot application, use SpringSecurityOAuth2AuthorizationServer...

JDBC...

Why can't the main class be found after copying and pasting the package in IDEA? Using IntelliJIDEA...

State synchronization between Java multi-interface calls: How to ensure that interface A is called after it is executed? In Java development, you often encounter multiple calls...


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

SublimeText3 Linux new version
SublimeText3 Linux latest version

SublimeText3 Mac version
God-level code editing software (SublimeText3)

SublimeText3 English version
Recommended: Win version, supports code prompts!

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.