If you need to run java program, simply install the JRE on it.
If you need to write java program, you need to install JDK.
JRE: (Java Runtime Environment). Covers most end-users needs. Contains everything required to run Java applications on your system.
JDK is a superset of JRE , and contains everything that is in JRE , plus tools such as the compilers and debuggers necessary for developing applets and applications. JRE provides the libraries, the Java Virtual Machine (JVM), and other components to run applets and applications written in the Java programming language.
Java SE Downloads
JavaSE is the standard version you can click to download
reference:
https://blog.csdn.net/qq_36667170/article/details/79323532