Issues Getting Button to Change Label Text

Question

Recently I've been trying to make a program that takes in a double in the form of a string. It then parses that to a double which goes to another class to be divided to a quarter or a half and then returns that output to a label.

I've been having an issue where when I click a button to actually submit what is inside the text field, the label doesn't change.

I've tried a lot of trial and error and I know I can change the text after doing new JLabel("test") for example. However, there seems to be an issue with my action listener for when the button is pushed. I can't tell if it's not seeing the button as being pushed.

NOTE: I am new to awt event things and swing as a whole, I usually operate just using the output terminal of visual studio code where it's just text and no graphics.

import javax.swing.*;
import java.awt.event.*;
import java.awt.Font;
import java.awt.Dimension;

public class MoneySorterRunner {
    
    private  MoneySorter sorter = new MoneySorter();

    private String input = "0";
    private double money = Double.parseDouble(input);
    private static JTextField typeHere = new JTextField();


///labels num1-3 are the labels being changed
    private static JLabel num1 = new JLabel(new MoneySorterRunner().sorter.divQuarter(new MoneySorterRunner().money));
    private static JLabel num2 = new JLabel(new MoneySorterRunner().sorter.divQuarter(new MoneySorterRunner().money));
    private static JLabel num3 = new JLabel(new MoneySorterRunner().sorter.divHalf(new MoneySorterRunner().money));

    public static void main(String args[]) {
        JFrame frame = new JFrame("Money Calculator - v0.1a");
        JPanel panel = new JPanel();
        JButton doThing = new JButton("Do a Thing");
        doThing.setActionCommand("Do a Thing");
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 250);
        frame.setLocation(200, 200);
        frame.setResizable(false);
        frame.setLocationRelativeTo(null);
        panel.setLayout(null);
        frame.setVisible(true);
        JLabel item1 = new JLabel("test");
        JLabel item2 = new JLabel("test");
        JLabel item3 = new JLabel("test");
        item1.setFont(new Font("Arial", Font.PLAIN, 30));
        item2.setFont(new Font("Arial", Font.PLAIN, 30));
        item3.setFont(new Font("Arial", Font.PLAIN, 30));
        num1.setFont(new Font("Arial", Font.PLAIN, 25));
        num2.setFont(new Font("Arial", Font.PLAIN, 25));
        num3.setFont(new Font("Arial", Font.PLAIN, 25));
        Dimension size1 = item1.getPreferredSize();
        Dimension size2 = item2.getPreferredSize();
        Dimension size3 = item3.getPreferredSize();
        panel.add(item1);
        panel.add(item2);
        panel.add(item3);
        panel.add(num1);
        panel.add(num2);
        panel.add(num3);
        panel.add(doThing);
        panel.add(typeHere);
        item1.setBounds(10, 10, size1.width + 3, size1.height);
        item2.setBounds(190, 10, size2.width + 3, size2.height);
        item3.setBounds(325, 10, size3.width + 3, size3.height);
        num1.setBounds(50, 50, 50, 25);
        num2.setBounds(200, 50, 50, 25);
        num3.setBounds(350, 50, 50, 25);
        doThing.setBounds(250, 150, 100, 25);
        typeHere.setBounds(100, 150, 150, 25);

    }

    public void actionPerformed(ActionEvent event){
        String check = event.getActionCommand();
        if(check.equals("Do a Thing")){
            input = typeHere.getText();
        }
        if(input != "0"){
            num1.setText(sorter.divQuarter(money));
            num2.setText(sorter.divQuarter(money));
            num3.setText(sorter.divHalf(money));
        }
    }

}

For those who wanted the MoneySorter.java:

    public MoneySorter(){

    }

    public String divQuarter(double moneyIn){
        String answer = Double.toString(moneyIn);
        return answer;
    }

    public String divHalf(double moneyIn){
        String answer = Double.toString(moneyIn);
        return answer;
    }
}

Answer 1

It looks like you forgot to set the ActionListener. You should also change your method to another name, because your method has the same name as the actionPerformed of the ActionListener.

doThing.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                new MoneySorterRunner().actionPerformedMethod(e);
            }
        });

Answer 2

You forgot to add the ActionListener. In order to fix this, you need to do two things:

1. Add this statement to your code, preferably near where you create the button (so that it is easier to keep track). -

doThing.addActionListener(this);

2. When you write "public class", you also need this keyword: implements ActionListener - meaning your class (basically the first line) should look like:

public class MoneySorterRunner implements ActionListener

And that should make it work.