Input won't trim

Question

Brand new to this but I'm not sure what I am doing wrong as the output will not trim.

package cs520.hw3.part1;

import javax.swing.JOptionPane;

public class StringTest {

    public static void main(String[] args) {

        String input = JOptionPane.showInputDialog("Enter data using the format Name, Age, City");
        //String delimiter = ",";
        //String[] tokens = input.split(delimiter);
        System.out.println(input.trim());
    }
}

Answer 1

There is a difference between removing the leading & trailing spaces (using trim() and replacing all spaces from a String (using replaceAll(" ", ""))

Example output

' Andrew,      52,  Sydney         '
'Andrew,      52,  Sydney'
'Andrew,52,Sydney'

1. Raw String
2. trim()
3. replaceAll(" ", "")

Code

import javax.swing.*;

public class TrimSpace {
    
    TrimSpace() {
        String s = JOptionPane.showInputDialog(null, 
                "Name, Age, City", 
                "Person Details", 
                JOptionPane.QUESTION_MESSAGE);
        // show the raw string entered by user
        System.out.println(String.format("'%1s'", s));
        // remove leading & trailing space from string
        System.out.println(String.format("'%1s'", s.trim()));
        // remove all spaces from string
        System.out.println(String.format("'%1s'", s.replaceAll(" ", "")));
    }
    
    public static void main(String[] args) {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                new TrimSpace();
            }
        };
        SwingUtilities.invokeLater(r);
    }
}