can we use string in switch

hi all,

i have a doubt,

can we use string values inside switch in java?

can any one explain me with example..

with regards,
Kalai.

yes we can

Not currently. Being able to use a string in a switch statement, is one of the proposed enhancements for Java 7 -- and will likely be adopted.

Henry

You can use enum members, however.

akhter wahab wrote:yes we can

In which version of Java are you running this? (Also, please make sure that if you post code to make it compilable, or indicate specifically that it won't. Thanks!)

yes we can

in wich version of java this code? as per my knowledge " byte,short,int,char" and their corresponding wrapper classes in addition to these "enum" are possible arguments

As noted, above the String example is not valid. Currently (Java 6 and below), two values must be comparable with == to be used in switch. Since this is not the case for String, it cannot be used.

satish varma wrote:in wich version of java this code?

I totally just said that.

two values must be comparable with == to be used in switch

check out that statements did you mean s1,s2 are not comparable?
ok any how, every case label must be a constant or a valid expression that gives constant as result. For that the possible switch arguments are type
byte,
short,
int,
char,
Byte,
Short,
Integer,
Character,
enum
here "enum" type value represents constant, and it avialable from JDK 1.5 version onwards. other than these types are invalid

satish varma wrote:

two values must be comparable with == to be used in switch

check out that statements String s1="example1"; String s2="example2"; did you mean s1,s2 are not comparable?

Since switch on string isn't supported yet -- a discussion about the implementation is kinda moot.

Regardless, with the proposed Java 7 implementation, I believe the proposal is for a switch on an integer (string hashcode), to be followed by a if check in the case body. And the check will be based on the value of the string (equals comparison).

Henry

ohh really!! i dont know about that thing, ok i will search
Thank you

Henry Wong wrote:Since switch on string isn't supported yet -- a discussion about the implementation is kinda moot.

Not entirely - JDK 7 milestone 5 has this feature. It hasn't been made it to a final production release yet, but an implementation is out there.

Hi ,

We can not use Strings inside the Switch statement. But we can use Compiletime Constants like final String TEMP in LABEL of the Switch statement.

Thanks for the link which explained proposed JAVA7 enhancement.

Praveen Kumar wrote:We can not use Strings inside the Switch statement. But we can use Compiletime Constants like final String TEMP in LABEL of the Switch statement.

Ah, no.

In current Java releases (JDK 6), we cannot use Strings inside a switch statement, period.

In JDK 7, which is not yet officially released, we can use Strings inside a switch - both as the value being switched on, and the values in the case labels. For the case labels, the string values must be compile-time constants.

Hi all,

i am using java 1.5.

hi Ranch Hand,Hi satish varma

String state variety = condition ? "fish" : "fowl";

in this ,

i do not understand what is state ,what is variety?

as of i know both are string objects.

i do not think it will execute properly..

i know we can use enum

thanks for the link for java 7....

thank you very much to all

with Regards,
Kalai.

The bit about "state variety" is incorrect syntax.

yes me too agree with Ritchie