While the accepted answer is good, be aware that you will end up with a leading empty string if your input string starts with a white space. For example, with:
String str = " Hello I'm your String";
String[] splitStr = str.split("\\s+");
The result will be:
splitStr[0] == "";
splitStr[1] == "Hello";
splitStr[2] == "I'm";
splitStr[3] == "Your";
splitStr[4] == "String";
So you might want to trim your string before splitting it:
String str = " Hello I'm your String";
String[] splitStr = str.trim().split("\\s+");
[edit]
In addition to the trim caveat, you might want to consider the unicode non-breaking space character (U+00A0). This character prints just like a regular space in string, and often lurks in copy-pasted text from rich text editors or web pages. They are not handled by .trim() which tests for characters to remove using c <= ' '; \s will not catch them either.
Instead, you can use \p{Blank} but you need to enable unicode character support as well which the regular split won't do. For example, this will work: Pattern.compile("\\p{Blank}", UNICODE_CHARACTER_CLASS).split(words) but it won't do the trim part.
The following demonstrates the problem and provides a solution. It is far from optimal to rely on regex for this, but now that Java has 8bit / 16bit byte representation, an efficient solution for this becomes quite long.
public class SplitStringTest
{
static final Pattern TRIM_UNICODE_PATTERN = Pattern.compile("^\\p{Blank}*(.*)\\p{Blank}$", UNICODE_CHARACTER_CLASS);
static final Pattern SPLIT_SPACE_UNICODE_PATTERN = Pattern.compile("\\p{Blank}", UNICODE_CHARACTER_CLASS);
public static String[] trimSplitUnicodeBySpace(String str)
{
Matcher trimMatcher = TRIM_UNICODE_PATTERN.matcher(str);
boolean ignore = trimMatcher.matches(); // always true but must be called since it does the actual matching/grouping
return SPLIT_SPACE_UNICODE_PATTERN.split(trimMatcher.group(1));
}
@Test
void test()
{
String words = " Hello I'm\u00A0your String\u00A0";
// non-breaking space here --^ and there -----^
String[] split = words.split(" ");
String[] trimAndSplit = words.trim().split(" ");
String[] splitUnicode = SPLIT_SPACE_UNICODE_PATTERN.split(words);
String[] trimAndSplitUnicode = trimSplitUnicodeBySpace(words);
System.out.println("words: [" + words + "]");
System.out.println("split: [" + Arrays.stream(split).collect(Collectors.joining("][")) + "]");
System.out.println("trimAndSplit: [" + Arrays.stream(trimAndSplit).collect(Collectors.joining("][")) + "]");
System.out.println("splitUnicode: [" + Arrays.stream(splitUnicode).collect(Collectors.joining("][")) + "]");
System.out.println("trimAndSplitUnicode: [" + Arrays.stream(trimAndSplitUnicode).collect(Collectors.joining("][")) + "]");
}
}
Results in:
words: [ Hello I'm your String ]
split: [][Hello][I'm your][String ]
trimAndSplit: [Hello][I'm your][String ]
splitUnicode: [][Hello][I'm][your][String]
trimAndSplitUnicode: [Hello][I'm][your][String]