Whitespaces in java

Question

What are kinds of whitespaces in Java  I need to check in my code if the text contains any whitespaces   My code is   if  text contains         text contains   t      text contains   r              text contains   n                code goes here        I already know about  n   t   r and space

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Use Character isWhitespace   rather than creating your own   In Java how does one turn a String into a char or a char into a String

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Why don t you check if text trim   has a different length     if text length      text trim   length      otherConditions         your code

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For a non-regular expression approach  you can check Character isWhitespace for each character   boolean containsWhitespace String s        for  int i   0  i  lt  s length      i            if  Character isWhitespace s charAt i                 return true                      return false           Which are the white spaces in Java    The documentation specifies what Java considers to be whitespace      public static boolean isWhitespace char ch       Determines if the specified character is white space according to Java  A character is a Java whitespace character if and only if it satisfies one of the following criteria          It is a Unicode space character  SPACE SEPARATOR  LINE SEPARATOR  or    PARAGRAPH SEPARATOR  but is not also a non-breaking space      u00A0        u2007     u202F      It is   u0009   HORIZONTAL TABULATION    It is   u000A   LINE FEED    It is   u000B   VERTICAL TABULATION    It is   u000C   FORM FEED    It is   u000D   CARRIAGE RETURN    It is   u001C   FILE SEPARATOR    It is   u001D   GROUP SEPARATOR    It is   u001E   RECORD SEPARATOR    It is   u001F   UNIT SEPARATOR

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boolean whitespaceSearchRegExp String input         return java util regex Pattern compile    s   matcher input  find

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boolean containsWhitespace   false  for  int i   0  i  lt  text length    amp  amp   containsWhitespace  i          if  Character isWhitespace text charAt i             containsWhitespace   true          return containsWhitespace    or  using Guava   boolean containsWhitespace   CharMatcher WHITESPACE matchesAnyOf text

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If you want to consider a regular expression based way of doing it  if text split    s   length  gt  1         text contains whitespace

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If you can use apache commons lang in your project  the easiest way would be just to use the method provided there   public static boolean containsWhitespace CharSequence seq    Check whether the given CharSequence contains any whitespace characters      Parameters   seq - the CharSequence to check  may be null         Returns   true if the CharSequence is not empty and contains at least 1 whitespace character    It handles empty and null parameters and provides the functionality at a central place

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From sun docs       s    A whitespace character     t n x0B f r    The simplest way is to use it with regex

[java] Whitespaces in java

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