下面程序的执行的结果是______。 public class ex48 { public static void main(String[] args) { String s1 = abc + def ; String s2 = new String(sl); if(s1 == s2) System.out.println ( == succeeded ); if (s1. equals (s2) ) System.out.println ( .equals () succeeded ); } }
A．== succeeded
B．.equals() succeeded
C．== succeeded
D．不输出任何结果 .equals() succeeded