What is the output(compare strings)? : Questions « File « SCJP

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public class MainClass {
    public static void main(String[] args) {
      String s1 = "abc";
      String s2 = s1;
      s1 += "d";
      System.out.println(s1 + " " + s2 + " " + (s1==s2));
 
     StringBuffer sb1 = new StringBuffer("abc");
     StringBuffer sb2 = sb1;
     sb1.append("d");
     System.out.println(sb1 + " " + sb2 + " " + (sb1==sb2));
   }
 }