Javafx 8 lambda expression error

Question

I got an illegal expression error when compiling javafx program. I have want to upload the screenshot but the stack exchange app. Is demanding that I need 10 reputation to be able to upload images!

btn.setOnAction( e-> buttonClick() );

the compiler point the e--> as illegal expression

I install JDK 8 and have set my environment variable

Yet I still get the error... guys help

Answer 1

If your are compiling using command line,You may be using jdk 7,try to set up JDK 8 from the environment variables.

Right click MyComputer->properties->Advanced System Settings Then in the advanced tab, select Environment variables, look for "path" under system variables look for your jdk path and change it to the jdk 8 path

in mycase

If jdk 7 path also exists, don't forget to delete it

Answer 2

I just find out the fault The reason for the error is that jdk 7 was still install on my system! I uninstall it and now it work