public class Main 
{
    public static void main(String[] args) 
    {
        System.out.println( "ABC".isBlank() );      //false
        System.out.println( "  ".isBlank() );       //true
 
        System.out.println( "ABC".isEmpty() );      //false
        System.out.println( "  ".isEmpty() );       //false
    }
}