W3School TIY Editor

public class Main {

  public static void main(String[] args) {

    System.out.println(Math.copySign(-4.7, 3));

    System.out.println(Math.copySign(4.7, -2.5));

    System.out.println(Math.copySign(3, 4)); 

    System.out.println(Math.copySign(-2.5, -4.7)); 

  }

}

​