Remove Unwanted Spaces From String using Java

Remove Unwanted Spaces From String

 
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Learn how to remove extra white spaces between words from a String using Java.
This is a article is how to remove Unwanted spaces from a string Given a string using java, remove all spaces from it.
For example  “   I      like         hpkingdom.com”  should be converted to “I like hpkingdom.com”  should be converted.
To right and ignore or remove the spaces while traversing. We need to keep track of two indexes, one for current character being read and other for current index in output.

Given 3 Methods:

  1. Remove Unwanted Space Using  String (Basic Method).
  2. Remove extra white spaces between words using regular expression.
  3. Replace multiple spaces with single space using StringBuiffer.
Remove extra spaces given a String  Example: Input :     I      like         hpkingdom.com output:I like hpkingdom.com

1.Remove Unwanted Spaces Using  String (Basic Method).

  1. using String
  2. Char Array
package hpkingdom.com; public class RemoveUnwantedSpace { public static void main(String[] args) { String s = "         I        Like             hpkingdom.com "; char c[] = s.toCharArray(); String ss = ""; for (int i=0; i<c.length; i++) { if (c[i]=='  ') { } else { ss=ss+c[i]; if (c[i+1]=='  '){ ss=ss+"  "; } } } System.out.println("Removed Spaces: " +ss); } }
Output:

Removed Spaces: I Like hpkingdom.com

2.Remove extra white spaces between words with regular expression

Using regular expression, to replace 2 or more white spaces with single space, is also a good solution. We are using regex pattern as “\\s+”.
  1. \s matches a space, tab, new line, carriage return, form feed or vertical tab.
  2. + says one or more occurrences.
package hpkingdom.com; public class RemoveUnwantedSpace { public static void main(String[] args) { String str = "I           Like        hpkingdom.com    "; String removespaces = str.replaceAll("\\s+", "  "); System.out.println( "Removed Spaces: " +removespaces ); } }

Output:

Removed Spaces: I Like hpkingdom.com

Note that this method will not trim the String. That means there might be single space at start at end of string, if original string has such white spaces at beginning or end.

3.Replace multiple spaces with single space using StringBuiffer

StringBuiffer can also help you to get string from uneven spaced strings. This is complete programmatic approach and may not be suitable for large strings.  
package hpkingdom.com; import java.util.StringTokenizer; public class RemoveUnwantedSpace { public static void main(String[] args) { String name = " I Like hpkingdom.com "; StringTokenizer st = new StringTokenizer(name, " "); StringBuffer sb = new StringBuffer(); while(st.hasMoreElements()) { sb.append(st.nextElement()).append(" "); } String nameSpace = sb.toString(); //trim leading and trailing white spaces nameSpace = nameSpace .trim(); System.out.println( "Removed Spaces: "+nameSpace ); } }

Output:

Removed Spaces: I Like hpkingdom.com

Please note that, as in case of regular expression, this method also may leave leading and trailing white spaces. So do not forget to trim the string after you have remove extra whitespaces between words in parameter string.   Thank you for watching! Please leave us your likes and comments.
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