Replacing whitespaces on a String and breaking them using toCharArray() doesn't seem to work

Question

I tried to do some String manipulation to play around with the methods available and I noticed that when I used the replaceAll("\\s+","") method to remove whitespaces in a String, it failed to do it.

System.out.print("Enter a word: ");
String word = scanner.next();
String cleansed = word.replaceAll("\\s+","");
char[] letters = cleansed.toCharArray();
for(char c : letters){
    System.out.print(c+" ");
}

When I go to the console and do something like,

Enter a word : I am entering some word.

The output I get on the console is I which seems to be dropping all other String values after the space.

What am I missing here?

I play around with different methods when there's nothing to do. So right now I just wonder why it's not working as expected.

I'd appreciate any help.

Thank you.

Please check this https://stackoverflow.com/a/26931946/540195 — Amit, May 03 '18 at 05:23
Can't reproduce. Maybe you tested with different content. Although it doesn't work as you expect anyway... Note that NOT all `String.replace*` methods take a *regex*... — ernest_k, May 03 '18 at 05:26
I see you used `replace("\\s+","")` but you mentioned `replaceAll("\\s+","")` — Deepak Sharma, May 03 '18 at 05:27
@DeepakSharma I edited the question. I'm using the latter which is `replaceAll("\\s+","");` — heisenberg, May 03 '18 at 05:33

score 2 · Accepted Answer · answered May 03 '18 at 05:34

You should use scanner.nextLine() instead of scanner.next(). Also use word.replaceAll() instead of word.replace()

Here is the working code:

import java.util.Scanner;

public class Example {
    public static void main(String[] a) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a word: ");
        String word = scanner.nextLine();
        String cleansed = word.replace("\\s+","");
        char[] letters = cleansed.toCharArray();
        for(char c : letters){
            System.out.print(c+" ");
        }
    }
}

The output will be:

Enter a word: Enter a word : I am entering some word.
E n t e r a w o r d : I a m e n t e r i n g s o m e w o r d .

Thanks. I failed to notice that at first. The code actually comes with other code blocks prior to this which is using the scanner methods `next()`, `nextLine()`. I suspect that the `next()` and `nextLine()` and `nextInt()` methods are getting mixed up since I'm using one `scanner` object. — heisenberg, May 03 '18 at 05:40

score 0 · Answer 2 · answered May 03 '18 at 05:40

0

try this

System.out.print("Enter a word: ");
String word = scanner.next();
word = word.replaceAll(" ","");
char letters [] = word.toCharArray();
for(char c : letters){
    System.out.print(c+" ");
}

answered May 03 '18 at 05:40

cloudiebro

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Replacing whitespaces on a String and breaking them using toCharArray() doesn't seem to work

2 Answers2