Solved

JDK6: about switch

Posted on 2010-11-27
2
759 Views
Last Modified: 2013-12-29
hi all,

the following codes give the output

9 10 10 d 13

but the variable s has actually value 9, 10 and 11.

can anyone explain how exactly here works?

Codes:

public class Ebb {

    static int x = 7;
    public static void main(String[] args) {
        // TODO code application logic here
        String s = "";
        for (int y = 0; y <3; y++) {
            x++;
            switch(x) {
                case 8: s += "8";
                case 9: s += "9";
                case 10: { s += 10; break;}
                default: s += "d";
                case 13: s+= "13";
            }
        }
        System.out.println(s);
    }

    static {
        x++;
    }
}

thanks,

wantime
0
Comment
Question by:wantime
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
2 Comments
 
LVL 4

Expert Comment

by:aaver
ID: 34221775
In a switch clause, every case is performed after the match until break in encountered.
0
 
LVL 4

Accepted Solution

by:
aaver earned 500 total points
ID: 34221807
In more detail:
In the loop x has the values 9, 10, and 11.
x = 9 -> the match is at case: 9 -> s += "9" // s = "9"
since no break is encountered the case: 10 is also performed -> s += 10 // s = "9" + 10 = "910"
now a break is encountered and the loop continues with the next value

x = 10 -> the match is at case: 10 -> s += 10 // s = "910" + 10 = "91010"
a break is encountered and the loop continues with the next value

x = 11 -> there is no match -> the match is at default:-> s += "d" // s = "91010" + "d" = "91010d"
since no break is encountered the case: 13 is also performed -> s += "13" // s = "91010d" + "13" = "91010d13"
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
V.simple question about Android packages and libraries 1 38
Chrome and Firefox Java 5 69
Glassfish admin console not working 1 61
Java: anonymous class 4 39
Java contains several comparison operators (e.g., <, <=, >, >=, ==, !=) that allow you to compare primitive values. However, these operators cannot be used to compare the contents of objects. Interface Comparable is used to allow objects of a cl…
This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
Viewers learn how to read error messages and identify possible mistakes that could cause hours of frustration. Coding is as much about debugging your code as it is about writing it. Define Error Message: Line Numbers: Type of Error: Break Down…
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question