IntelliJ switch statement using Strings error: use -source 7

Question

I'm trying to use IntelliJ (on Mac OS X) to compile some code I wrote using Eclipse. I've attempted to run the following code:

switch (category) {
    case "below 20":
        below20++;
        break;
    case "20 to 29":
        to30++;
        break;
    case "30 to 39":
        to40++;
        break;
    case "40 to 49":
        to50++;
        break;
    case "50 to 59":
        to60++;
        break;
    case "60 to 69":
        to70++;
        break;
    case "70 t0 79":
        to80++;
        break;
    case "80 to 89":
        to90++;
        break;
    case "90 to 99":
        above90++;
        break;
    default:
        break;
}

However, I get the error:

java: strings in switch are not supported in -source 1.6
  (use -source 7 or higher to enable strings in switch)

I know that some of the answers will be: RTFE (i.e. replace Manual with Error). But I did. I've attempted the following:

• Preferences > Compiler > Java Compiler and added -source 7 and/or -target 1.7 to Additional command line parameters
• Edit Configurations: checked Use Alternative JDK and wrote in the directory /Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home

And it hasn't fixed it. What am I doing wrong?

Note: I know this is obvious because the directory is above, but I do have Java 7 installed.

Thanks in advance!

Answer 1

At the Intellij IDEA you should also go to Project Settings -> Project and set appropriate Project language level there