I can write a method that will clear the console:

 System.out.print("\033[H\033[2J");
 System.out.flush();

and this method works great with online IDEs like Juicemind and Repl.it. I think it's because they are UNIX based.

However, when I try to run it using Dr. Java, it won't work. I don't think Dr. Java supports ANSI escape codes. I am also almost 100% certain that Dr. Java is not UNIX Based.

I also could not get Dr. Java to correctly execute this option:

import java.io.IOException;

public class CLS {
    public static void main(String... arg) throws IOException, InterruptedException {
        new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
    }
}

When I try this one:

import java.io.IOException;

public class CLS {
    public static void main(String[] arg) throws IOException, InterruptedException {
       
     
       clearConsole(); 
    }
    
    public static void clearConsole() throws Exception {
       String os = System.getProperty("os.name").toLowerCase();
       if (os.contains("windows")) {
          new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
       } else {
          new ProcessBuilder("clear").inheritIO().start().waitFor();
    }
}
}

I get a compiler error that I don't know how to fix:

2 errors found:
[line: 12]
Error: The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class files
 [line: 12]
Error: The method contains(java.lang.CharSequence) from the type java.lang.String refers to the missing type java.lang.CharSequence

Does anyone have any experience with a way to clear the console for a lightweight pedagogical environment like Dr. Java? Is there something about Dr. Java that prevents one from writing a method that will clear the console?