How to Remove string spaces in JAVA

1. String. trim ()

Trim () is to remove spaces at the beginning and end

2. str. replace ("", ""); remove all spaces, including the beginning, end, and middle.

The code is as follows:	Copy code
String str = "hell o "; String str2 = str. replaceAll ("",""); System. out. println (str2 );

3. Or replaceAll ("+", ""); remove all spaces.

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4. str =. replaceAll ("\ s *","");

Can replace most of the white space characters, not limited to spaces

S can match any of the spaces, tabs, page breaks, and other blank characters.

Or the following code can also remove all spaces, including the beginning, end, and middle.

The code is as follows:	Copy code
Public String remove (String resource, char ch)     { StringBuffer buffer = new StringBuffer (); Int position = 0; Char currentChar; While (position <resource. length ())         { CurrentChar = resource. charAt (position ++ ); If (currentChar! = Ch) buffer. append (currentChar);} return buffer. toString ();   }

Let's take a look at the instance.

 

The code is as follows:

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Import java. util. regex. Matcher; Import java. util. regex. Pattern; /** * @ Author lei * 2011-9-2 */ Public class StringUtils { Public static String replaceBlank (String str ){ String dest = ""; If (str! = Null ){ Pattern p = Pattern. compile ("\ s * | t | r | n "); Matcher m = p. matcher (str ); Dest = m. replaceAll (""); } Return dest; } Public static void main (String [] args ){ System. out. println (StringUtils. replaceBlank ("just do it! ")); } /*----------------------------------- Stupid method: String s = "the String you want to remove "; . Remove spaces: s = s. replace ('\ S ',''); . Remove the carriage return: s = s. replace ('N ',''); In this way, the space and press enter can be removed, and others can be taken as well. Note: n press enter (u000a) T horizontal tab (u0009) S space (u0008) R line feed (u000d )*/ }