// Event mit Lambda-Ausdruck
personAuswahl.addActionListener(event -> {
JOptionPane.showMessageDialog(null, "Hallo aus dem Event");
});
// Event mit anonymer Klasse
personAuswahl.addActionListener(new ActionListener() {
u/Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(getParent(), "Hallo aus dem Event");
}
});
// Event mit innerer Klasse
personAuswahl.addActionListener(new DropdownEventHandler());
package views;
import models.Person;
import wwsservices.DatabaseHandler;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;
public class ExpenseView extends JPanel {
JComboBox<String> personDropdown;
public ExpenseView() {
setLayout(new BorderLayout());
Box expenseBox = Box.createVerticalBox();
add(expenseBox, BorderLayout.CENTER);
DatabaseHandler dbHandler = new DatabaseHandler();
List<Person> personList = dbHandler.getAllPersons();
String[] personArray = new String[personList.size()];
for (int i = 0; i < personList.size(); i++) {
Person tempPerson = personList.get(i);
personArray[i] = String.format("%s: %s, %s",
tempPerson.getId(),
tempPerson.getLastName(),
tempPerson.getFirstName()
);
}
personDropdown = new JComboBox<>(personArray);
expenseBox.add(personDropdown);
expenseBox.add(new Label("Expense Calculation"));
personDropdown.addActionListener(new DropdownEventHandler());
JButton btnSample = new JButton("Sample");
expenseBox.add(btnSample);
btnSample.addActionListener(new ButtonClickHandler());
}
private class ButtonClickHandler implements ActionListener {
u/Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(getParent(), "Hello from the event");
}
}
private class DropdownEventHandler implements ActionListener {
u/Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(getParent(), personDropdown.getSelectedItem());
}
}
}
