[Java] Komischer Fehler bei Loginfenster

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JButton cannot be cast to javax.swing.JPasswordField
 at MainFrame$3.actionPerformed(MainFrame.java:72)
 at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
 at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
 at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
 at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
 at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
 at java.awt.Component.processMouseEvent(Component.java:6038)
 at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)
 at java.awt.Component.processEvent(Component.java:5803)
 at java.awt.Container.processEvent(Container.java:2058)
 at java.awt.Component.dispatchEventImpl(Component.java:4410)
 at java.awt.Container.dispatchEventImpl(Container.java:2116)
 at java.awt.Component.dispatchEvent(Component.java:4240)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
 at java.awt.Container.dispatchEventImpl(Container.java:2102)
 at java.awt.Window.dispatchEventImpl(Window.java:2429)
 at java.awt.Component.dispatchEvent(Component.java:4240)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

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

public class MainFrame extends JFrame {
 // Anfang Variablen
 private JLabel picLabel = new JLabel();
 private JLabel logLabel = new JLabel();
 private JButton jButton1 = new JButton();
 // Ende Variablen

 public MainFrame(String title) {
 // Frame-Initialisierung
 super("Welcome");
 addWindowListener(new WindowAdapter() {
 public void windowClosing(WindowEvent evt) { System.exit(0); }
 });
 int frameWidth = 640;
 int frameHeight = 415;
 setSize(frameWidth, frameHeight);
 Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
 int x = (d.width - getSize().width) / 2;
 int y = (d.height - getSize().height) / 2 ;
 setLocation(x, y);
 Container cp = getContentPane();
 cp.setLayout(null);
 // Anfang Komponenten
 picLabel.setBounds(0,0,640,415);
 picLabel.setIcon(new ImageIcon("images/tee_main.jpg"));
 cp.add(picLabel);

 JLabel jlbPassword = new JLabel("Enter the password: ");
 jlbPassword.setBounds(110,300,150,25);
 jlbPassword.setForeground(Color.WHITE);
 final JPasswordField jpwName = new JPasswordField(10);
 jpwName.setBounds(250,300,140,25);
 jpwName.setEchoChar('•');
 jpwName.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 JPasswordField input = (JPasswordField)e.getSource();
 char[] password = input.getPassword();
 if (isPasswordCorrect(password)) {
 JOptionPane.showMessageDialog(null, "Richtig.");
 new TestFrame("TestFrame");
 dispose();

 } else {
 JOptionPane.showMessageDialog(null, "Leider falsch.",
 "Error Message", JOptionPane.ERROR_MESSAGE);
 jpwName.selectAll(); 
 }
 }
 });


 picLabel.add(jlbPassword);
 picLabel.add(jpwName);

 jButton1.setBounds(420, 300, 65, 25);
 jButton1.setText("Login");
 picLabel.add(jButton1);
 jButton1.addActionListener(new ActionListener() { 
 public void actionPerformed(ActionEvent evt) {
 JPasswordField input = (JPasswordField)evt.getSource();
 char[] password = input.getPassword();
 if (isPasswordCorrect(password)) {
 JOptionPane.showMessageDialog(null, "Richtig.");
 new TestFrame("TestFrame");
 dispose();

 } else {
 JOptionPane.showMessageDialog(null, "Leider falsch.",
 "Error Message", JOptionPane.ERROR_MESSAGE);
 jpwName.selectAll(); //siehe oben.
 }

 }
 });

 // Ende Komponenten

 setResizable(false);
 setVisible(true);
 }

 // Anfang Ereignisprozeduren
 
 private static boolean isPasswordCorrect(char[] inputPassword) {
 char[] actualPassword = {'t', 'e', 's', 't'};
 if (inputPassword.length != actualPassword.length){
 return false;
 }
 for (int i = 0; i < inputPassword.length; i ++){
 if (inputPassword[i] != actualPassword[i]){
 return false;
 }
 }
 return true;
 }

 // Ende Ereignisprozeduren

 public static void main(String[] args) {
 new MainFrame("MainFrame");
 }
}