Have two JDK installed, how to switch the java compiler in Eclipse [duplicate]

I am wondering how to switch the java compiler in Eclipse.

How do I change the Compiler in Eclipse?

To change the compiler version in eclipse you need to go to Windows > Preferences > Java > Compiler. There you will see Compiler Compilation Level where in drop-down you will see all compiler version available in system.

How do I change the default Java version in eclipse?

Configure the default JRE Set it as the default in Eclipse by selecting Preferences -> Java -> Installed JREs. Add the installed JDK and select the checkbox, making it the default.

Eclipse does not use the compiler in the JDK, just the runtime libraries. The compiler is embedded in Eclipse (so you can run on a plain JRE).

You set all the compiler properties in the Java->Compiler preference window, and the class libraries in the chosen JRE.