How to exclude white spaces

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2

Example

String str = "  texto com     espaços   em     branco           ";

Upshot
"text with white spaces"

java

  • at the ends with String#trim(), already have a recent question about him.

  • It is not only in the extremities, but also the spaces too.

2 answers

4

You can use a regular expression:

System.out.println("  texto com   espaços   em  branco".replaceAll("\\s+", " "));

Upshot

text with white spaces

To also remove the spaces at the ends, you can first apply the Trim function():

System.out.println("  texto com   espaços em  branco".trim().replaceAll("\\s+", " "));

The idea is that regular expression \s corresponds to any blank character.

If any pattern is followed by a +, it means that this pattern needs to appear 1 or more times. In this case, s+, house (match) with one or more consecutive blanks.

This information is then passed to the Replaceall function which replaces the consecutive spaces found, with only one blank.

Stay here the example and the source.

  • I was just about to comment on that, I was getting some space behind the edges.

0

You can use the Scanner class

    Scanner s = new Scanner(text);
    String t = null;
    while (s.hasNext()) {
        if(t == null)
            t = s.next();
        else
            t = t +" "+s.next();
    }       
    System.out.println(t);

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  • Scanner is a class of Java, https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html

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