Let's first understand the relationship between jdk, jre, and jvm
JVM is used to run bytecode. If we only use it to run java programs, we only need to deploy jre. If we need to develop java, we need a jdk environment.
java structure content:
The java architecture relationship is shown in the following figure:
The java program calls the java api after compilation, generates a bytecode file, and passes the bytecode file to the jvm to run