Is there a convenience method to strip any leading or trailing spaces from a Java String?
Something like:
String myString = " keep this ";
String stripppedString = myString.strip();
System.out.println("no spaces:" + strippedString);
Result:
no spaces:keep this
myString.replace(" ","") would replace the space between keep and this.
Use String#trim() method or String allRemoved = myString.replaceAll("^\\s+|\\s+$", "") for trim both the end.
For left trim:
String leftRemoved = myString.replaceAll("^\\s+", "");
For right trim:
String rightRemoved = myString.replaceAll("\\s+$", "");
trim() is your choice, but if you want to use replace method -- which might be more flexiable, you can try the following:
String stripppedString = myString.replaceAll("(^ )|( $)", "");
With Java-11 and above, you can make use of the String.strip API to return a string whose value is this string, with all leading and trailing whitespace removed. The javadoc for the same reads :
/**
* Returns a string whose value is this string, with all leading
* and trailing {@link Character#isWhitespace(int) white space}
* removed.
* <p>
* If this {@code String} object represents an empty string,
* or if all code points in this string are
* {@link Character#isWhitespace(int) white space}, then an empty string
* is returned.
* <p>
* Otherwise, returns a substring of this string beginning with the first
* code point that is not a {@link Character#isWhitespace(int) white space}
* up to and including the last code point that is not a
* {@link Character#isWhitespace(int) white space}.
* <p>
* This method may be used to strip
* {@link Character#isWhitespace(int) white space} from
* the beginning and end of a string.
*
* @return a string whose value is this string, with all leading
* and trailing white space removed
*
* @see Character#isWhitespace(int)
*
* @since 11
*/
public String strip()
The sample cases for these could be:--
System.out.println(" leading".strip()); // prints "leading"
System.out.println("trailing ".strip()); // prints "trailing"
System.out.println(" keep this ".strip()); // prints "keep this"
To trim specific char, you can use:
String s = s.replaceAll("^(,|\\s)*|(,|\\s)*$", "")
Here will strip leading and trailing space and comma.
s.strip() you can use from java 11 onwards.
s.trim() you can use.
private void capitaliseEveryWordInASentence() {
String mm = "Hello there, this is the cluster";
String[] words = mm.split(" ");
String outt = "";
for (String w : words) {
outt = outt + Character.toUpperCase(w.charAt(0)) + w.substring(1) + " ";
}
System.out.println(outt.trim());
}
String.stripto this.