WHAT are people moving to or are considering moving to?

I create a new Java project with main and copy all my existing sample java file into the src folder and put the following code

package com.mediatec;

public class Main {

    public static void main(String[] args) {

        new jList001();
    }
}

if I comment out the new jList001(); and run any of the sample java file and it work. when I try to run or debug the main.java where the above code is, I got the following error

java: cannot find symbol
symbol: class jList001
location: class com.mediatec.Main