W3School TIY Editor

public class Main {

  public static void main(String[] args) {

    System.out.println(Math.sqrt(0));

    System.out.println(Math.sqrt(1));

    System.out.println(Math.sqrt(9));

    System.out.println(Math.sqrt(0.64));

    System.out.println(Math.sqrt(-9));

  }

}

​