If you have previously installed older version(s) of JDK/JRE, un-install ALL of them. Although you can install multiple versions of JDK/JRE concurrently, it is messy. I recommend that you install only the latest JDK. How To Install JDK on Windows Step 0: Un-Install Older Version(s) of JDK/JRE Since you are supposed to write Java Programs instead of merely running Java programs, you should install JDK, which includes JRE. JDK (Java Development Kit), which includes JRE plus the development tools (such as compiler and debugger), is need for writing as well as running Java programs. JRE (Java Runtime), which include a Java Virtual Machine and core libraries, is needed for running Java programs. Java SE 17 LTS (JDK 17) (September 2021): LTS.Java SE 13 (19.9) (JDK 13) (September 2019): Switch Expression (preview), Multi-line Text Block (preview).OracleJDK is no longer free for commercial use, but OpenJDK is still free. Clean up the JDK and the installation package (removed JavaFX, JavaEE, CORBA modules, deprecated Nashorn JavaScript engine). Java SE 11 LTS (18.9) (JDK 11) (September 2018): Extended var to lambda expression.Removed native-header generation tool javah. Introduced time-based release versioning with two releases each year, in March and September, denoted as YY.M. Java SE 10 (18.3) (JDK 10) (March 2018): Introduced var for type inference local variable (similar to JavaScript).Java SE 9 (JDK 9) (September 21, 2017): Introduced modularization of the JDK ( module) under project Jigsaw, the Java Shell ( jshell), and more.Also integrated JavaFX graphics subsystem.
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