What do the bin files and jre files in java do?

First of all, we need to understand the difference between JDK and JRE

JDK (Java Development Kit) is a software development tool kit for the Java language

JRE (Java Runtime Environment) , that is, Java runtime environment

When you install the complete JDK, jre will be installed automatically. jre is in the JDK directory. In fact, you can understand that they are two things, but jre is also placed under the JDK directory and the bin of jdk. Directory level

JDK is the development environment, jre is the running environment, the bin directory under the JDK directory is the necessary components and tools for the development environment

JRE running environment, the bin folder under the jre directory It is a necessary component for java to run