Java SubStrings and Arrays

Question

If I have a String variable containing a sentence, does anybody know how to extract the words from that sentence and store them in an array?

e.g. Take the String ("Hello World")

and store it like ["Hello","World"]

This is what I have been trying, but it doesn't work at all:

int newWord = 0;
String sentence;
String[] words;

for(count = 0; count < sentence.length(); count++)
    {
        words[newWord].charAt(count) = sentence.charAt(count);

        if(sentence.charAt(count) == ' ' )
        {
            newWord++;
        }
    }

You can do what Elliott said below or also "Hello World".split(" "); — 3kings
– 3kings, Commented Oct 16, 2015 at 23:13

Elliott Frisch · Accepted Answer · 2015-10-16 23:15:18Z

4

You can use String.split(String) and a regular expression like \\s+ (for one or more whitespace characters). Something like,

String[] words = "Hello World".split("\\s+");
System.out.println(Arrays.toString(words));

Output is (as requested)

[Hello, World]

edited Oct 16, 2015 at 23:15

answered Oct 16, 2015 at 23:12

Elliott Frisch

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2 Comments

user4922773 Over a year ago

@ElliotFrisch Thank you. Will this work if I am receiving input from the user and I cannot know the value of the String beforehand?

Elliott Frisch Over a year ago

Yes. Replace "Hello World" with a String reference variable.

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