how to show variable's value in pop up dialog with java swing



I am a beginner in programming. I was messing around with java swing and tried to make a silly app. This is my code. It's not showing any errors, but it's not working. When the dialog pops up, the variable's value doesn't show on the dialog. The logic i used is right, because when i run it in the compiler without the GUI stuff, it works perfectly. If anyone could tell what am i doing wrong in here, it would be really helpful.

this is my code for the calculations.

import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JOptionPane;

public class swingApp extends JFrame{
    JLabel label;
    JButton button;
    public JLabel label2;
    JTextField textField = new JTextField("enter you nicknamae");
    String username=textField.getText();
    public int geniusMeter;
    public int sum=0;
    public String sumAsString;
    public void swingAppLogic(String name){
        char[] letters = username.toCharArray();
        char []
alphabet={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
        int []
measure={7,3,1,13,8,26,15,18,2,5,22,20,16,9,5,11,23,12,25,6,4,21,24,14,17,10};

        for(int count=0;count<letters.length;count++){
            for (int count1=0;count1<alphabet.length;count1++){
                if (letters[count]==alphabet[count1]){
                    geniusMeter=measure[count1];
                    sum=sum+geniusMeter;
                    break;
                }
            }
        }
        sumAsString = Integer.toString(sum);

    }

    public swingApp(){
        super("Genius Calculator");
        setLayout(new FlowLayout());
        label = new JLabel("Wanna know how genius you are?"); 
        label2 = new JLabel(" ");
        button = new JButton("press enter and then click me to know
the results");
        handlerClass handler = new handlerClass();
        button.addActionListener(handler);
        add(label);
        add(label2);
        add(button);
        add(textField);
    }
    public class handlerClass implements ActionListener{
        public void actionPerformed(ActionEvent event){
            JOptionPane.showMessageDialog (null, sumAsString, "Title",
JOptionPane.INFORMATION_MESSAGE);

        }
    }
}

and this is my main method

import javax.swing.JFrame;

public class swingAppTester{
    public static void main (String [] args){
        swingApp object=new swingApp();

        object.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        object.setSize(500,400);
        object.setVisible(true);
    }
}

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