Using IntelliJ IDEA, cannot figure out how to compile and run a simple program

Question

The code:

public class var3
{
    public static void main( String[] args )
    {
        int num = 113;
        double num2 = 2.71828;
        string cs = "Computer Science";
        System.out.println(num);
        System.out.println(num2);
        System.out.println(cs);
        System.out.println("hello");
    }
}

I just can't figure out how to run it. When I click run, I see this:

"C:\Program Files\Java\jdk1.7.0_17\bin\java" -Didea.launcher.port=7537 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 12.0.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.7.0_17\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\jfxrt.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\rt.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.7.0_17\jre\lib\ext\zipfs.jar;C:\Programming\unit1\out\production\unit1;C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 12.0.4\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain Main

Process finished with exit code 0

But none of my System.out.println();'s.

Bastien Jansen Bastien Jansen · Accepted Answer · 2013-03-11T09:24:34

It's launching another class named Main, which I guess prints nothing:

com.intellij.rt.execution.application.AppMain **Main**

You can also see it in the combobox next to the green arrow. If you want to run another class (here var3), right click in your file and choose Run 'var3.main()'.

The green arrow always launches the run configuration selected in the combobox, not the file you are currently editing.

Using IntelliJ IDEA, cannot figure out how to compile and run a simple program

1 Answers