How to remove duplicated white spaces in a string and count the number of removed spaces in Java?

Question

This forum has a solution for removing duplicated white spaces in java using

String.replaceAll()

However this solution can't be applied if we need to count the removed white spaces. Is there any other way to solve this problem?

you will have to implement your own function, this does not exist by default. — Robot Mess, Mar 11 '14 at 16:20

score 1 · Answer 1 · answered Mar 11 '14 at 16:18

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Before you replaceAll() you could iterate over all characters with stringVar.toCharArray() and count.

answered Mar 11 '14 at 16:18

nrubin29

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Thomas Jungblut · Answer 2 · 2014-03-11T16:25:44.543

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Why not?

 String s = "     ";
 String whiteSpaceLess = s.replaceAll("  ", "");
 int diff = s.length() - whiteSpaceLess.length();

edited Mar 11 '14 at 16:25

answered Mar 11 '14 at 16:20

Thomas Jungblut

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This would replace all White spaces. And replaceAll takes two arguments – Lukas Eichler Mar 11 '14 at 16:26
@Templar yes you are right, I hit some site errors, so I did submit the answer prematurely and couldn't edit. – Thomas Jungblut Mar 11 '14 at 16:30

score 1 · Answer 3 · answered Mar 11 '14 at 16:20

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Simply retain the original string in another variable. After trimming it from extra spaces, just calculate the length difference: this is the number of spaces removed.

answered Mar 11 '14 at 16:20

fge

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score 1 · Answer 4 · answered Mar 11 '14 at 16:21

If you have a String s,

String t = s.replaceAll("\\s+", " ");
System.out.println(t);
int count = s.length() - t.length();
System.out.println(count);

You can remove the whitespaces using replaceAll, and count the difference in length between the strings to get the number of removed spaces.

How to remove duplicated white spaces in a string and count the number of removed spaces in Java?

4 Answers4