Summary of basic Java interview questions (2): The difference between jvm, jre, and jdk in Java

JVM, JRE and JDK are important concepts in Java programming language, and the differences between them are as follows:

1. JVM (Java Virtual Machine): It is one of the core components of the Java platform and is responsible for interpreting Java bytecode into machine code that the computer can execute. JVM provides garbage collection, memory management, security and other functions, and can run Java applications on different operating systems.

2. JRE (Java Runtime Environment): It is the environment that Java applications rely on to run, including Java Virtual Machine (JVM), Java class libraries and other necessary files. JRE is only used to run Java applications and cannot be used to develop Java applications.

3. JDK (Java Development Kit): It is a toolkit used by Java developers to develop Java applications, including Java compilers, Java virtual machines, Java class libraries, debugging tools, performance analysis tools, etc. The JDK contains all the features of the JRE and also contains the tools and resources needed to develop Java applications.

To summarize, JVM is the core component of the Java platform, responsible for interpreting Java bytecode into machine code; JRE is the environment that Java applications rely on, including Java virtual machines, Java class libraries and other necessary files; JDK is Java A toolkit used by developers to develop Java applications, including Java compilers, Java virtual machines, Java class libraries, debugging tools, performance analysis tools, etc.