下面程序执行后的输出结果为( )。 public class fun { public static void main(String args[]) { String greets = ' How are you!'; String s = greets.substring(0,3); System.out.println(s); } }A.HowB.areC.youD.how are you!
A.substring(0,3);
B.out.println(s);
C.How
B.are
C.you
D.how