CODEWITHSUNDEEP
javastringtrim
wam090
wam090

Reputation: 2873

Using a simple scanner, reading a string with spaces, how come .trim() method isn't working?

import java.util.Scanner;
import java.lang.String;

public class Test
{
    public static void main(String[] args)
    {
        char[] sArray;

        Scanner scan = new Scanner(System.in);

        System.out.print("Enter a Palindrome : ");
        String s = scan.nextLine();
        s = s.trim();

        sArray = new char[s.length()];

        for(int i = 0; i < s.length(); i++)
        {
            sArray[i] = s.charAt(i);
            System.out.println(sArray[i]);
        }
    }
}

Upvotes: 1

Views: 26835

Answers (3)

Ted Betz
Ted Betz

Reputation: 1621

great answer jjnguy and slals

I now use

myinput = myEditTextbox.getText().toString;
myinput = myinput.replaceAll("\\S+", "");

to clean out all spaces accidentally left in an edittext box by the user. It also directed me to learn about regular expressions that I didn't know about. Thanks

Upvotes: 0

jjnguy
jjnguy

Reputation: 138922

Trim doesn't work how you expect it to. trim() only removes whitespace from the ends of the string.

The documentation for trim():

Returns a copy of the string, with leading and trailing whitespace omitted.

To remove all whitespace try the following instead of calling trim():

s = s.replaceAll("\\s+", "");

This uses a very simple regular expression to remove all whitespace anywhere in the string.

Upvotes: 4

SLaks
SLaks

Reputation: 887807

The trim function removes leading and trailing spaces, not all spaces.

If you want to remove all spaces, you can call s = s.replaceAll(" ", "").

Upvotes: 2

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