Need help to trace java code

[Sandra Bachan]

Hello,

I am studying for SCJP 6 Exam, and came across this question which shows code as asks for the output

 

 3. public class Ebb {
 4.   static int x = 7;
 5.   public static void main(String[] args) {
 6.     String s = "";
 7.     for(int y = 0; y < 3; y++) {
 8.       x++;
 9.       switch(x) {
10.         case 8: s += "8 ";
11.         case 9: s += "9 ";
12.         case 10: { s+= "10 "; break; }
13.         default: s += "d ";
14.         case 13: s+= "13 ";
15.       }
16.     }
17.     System.out.println(s);
18.   }
19.   static { x++; }
20. }

The answer says 9 10 10 d 13 will be output. However, when I hand-traced the program, I keep getting 9 10 d 13. Can you please help? Below is my trace:

step 1: x is set to 7

step 2: x is incremented to 8 (because of static x++)

step 3: string s is initialized to ""

step 4: for loop begins, y is set to 0

step 5: x is incremented to 9

step 6: case 9 appends 9 to string s

step 7: for loop, y is set to 1

step 8: x is incremented to 10

step 9: case 10 appends 10 to string s and breaks out of switch, y is set to 2

step 10: x is incremented to 11

step 11: case default appends d to string s

step 12: case 13 appends 13 to string s, y is set to 3

step 13: loop exits, and prints 9 10 d 13

[Henry Wong]

step 6.5: fall through to case 10 which appends 10 to string s and breaks out of switch

[Christophe Verré]

"jhoom barabar jhoom",
Welcome to the ranch ! Please check your Private Messages for an important administrative matter.

[Sandra Bachan]

Henry Wong wrote:step 6.5: fall through to case 10 which appends 10 to string s and breaks out of switch

Now it seems so obvious - I was staring at this problem for three days!!!

[Jesper de Jong]

Sandra Bachan wrote:... and came across this question ...

Welcome to JavaRanch.

Please note that if you copy a question from a book, mock exam or other source, we require you to QuoteYourSources. So, please tell us where you copied this question from.

[Sandra Bachan]

Jesper Young wrote:

Sandra Bachan wrote:... and came across this question ...

Welcome to JavaRanch.

Please note that if you copy a question from a book, mock exam or other source, we require you to QuoteYourSources. So, please tell us where you copied this question from.

Of course:

SCJP Sun® Certified Programmer for Java™ 6 Study Guide Exam (310-065) (9780071591065)
Kathy Sierra; Bert Bates.

This particular question from Chapter 5, Question 8