Java Data Type - 如何是白色空间

isWhitespace():true if the argument is whitespace.
which is any one of the following characters:
space (' '), tab ('\t'), newline ('\n'), carriage return ('\r'),form feed ('\f')
    
public class MainClass {
  public static void main(String[] args) {
    char symbol = 'A';

    if (Character.isWhitespace(symbol)) {
      System.out.println("true");
    }else{
      System.out.println("false");
    }
  }
}