How to define special characters in string array java

Question

I need to define an array containing below all special characters..

+ - && || ! ( ) { } [ ] ^ " ~ * ? : \

I am using this

List<String> specialCharactersInSolr = Arrays.asList(new String[] {
                "+", "-", "&&", "||", "!", "(", ")", "{", "}", "[", "]", "^",
                "~", "*", "?", ":", });

It is accepting all the character except " and \

Please help how to define these two as well.

just escape them with a backslash! And why are you not using `Character` instead of `String`? — jlordo, Jul 12 '13 at 10:25
Use `"\""` and `"\\"` respectively. But you say you want characters here and define strings instead? — fge, Jul 12 '13 at 10:26
@jlordo. Probably because he also needs to store - `&&` and `||`. — Rohit Jain, Jul 12 '13 at 10:26
"It is accepting all the character" here "it" means the compiler. What error message did it give? Because that would have given you a clue. — Raedwald, Jul 12 '13 at 12:39

Pshemo · Accepted Answer · 2014-04-09T13:19:01.463

10

\ and " are special characters in String class

" is start or end of String
\ is used to create some characters like new lines \n \r tab\t or to escape special characters like in your case \ and "

So to make them literals you will have to escape them with "\\" and "\""

Other idea is to use Character[] instead of String[] so you wont have to escape " and yours characters can be written as '"' or '\\' (because ' require escaping - it should be written as '\'' - \ is also special here and will also require escaping to produce its literal).

edited Apr 09 '14 at 13:19

answered Jul 12 '13 at 10:27

Pshemo

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And in turn escape the backslashes as well. – Rohit Jain Jul 12 '13 at 10:28
@RohitJain this ain't regex. double backslash is how you write a single backslash – Bohemian Jul 12 '13 at 10:29
@RohitJain you are mistaken this will work fine.Try it your self – Ruchira Gayan Ranaweera Jul 12 '13 at 10:29
@Bohemian. Ah! right. Mixed it up with regex. Sorry. It'll work fine. – Rohit Jain Jul 12 '13 at 10:30
@TanuGarg Glad it works for you. Since you are not so active SO user you probably don't know about [accepting answer](http://meta.stackexchange.com/a/5235/186652) mechanism. You should probably read it. – Pshemo Jul 12 '13 at 11:49
Ya i m not so active. But now i am trying to accept it. But it is not click able. – Tanu Garg Jul 12 '13 at 11:58
@TanuGarg Are you clicking tick under answer score? Do you have any error information saying why you cant accept answer? – Pshemo Jul 12 '13 at 12:00
@TanuGarg Maybe you have some AdBlock or other filters. Try refreshing page. If this wont help maybe try using other browser. – Pshemo Jul 12 '13 at 12:19

score 4 · Answer 2 · edited Jul 12 '13 at 10:32

4

Use this

List<String> specialCharactersInSolr = Arrays.asList(new String[]{
            "+", "-", "&&", "||", "!", "(", ")", "{", "}", "[", "]", "^",
            "~", "*", "?", ":","\"","\\"});

here "\"" and "\\" are for " and \

edited Jul 12 '13 at 10:32

Bohemian

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answered Jul 12 '13 at 10:26

Ruchira Gayan Ranaweera

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Won't work. You need to escape the backslashes as well. This has to be done in Java. – Rohit Jain Jul 12 '13 at 10:27
@RohitJain wrong. this above code is fine. you thinking of how to write a literal backslash in regex maybe – Bohemian Jul 12 '13 at 10:30

How to define special characters in string array java

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