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CurrencyCalculator.java
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CurrencyCalculator.java
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package de.niklas.exercise.ui.event;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* <strong>Währungsumrechner (2)</strong><br>
* Einen Mini Währungsrechner inkl. Funktion
*
* @see "23_Events_Aufgaben-1.pdf"
* @author Niklas Buse
*/
public class CurrencyCalculator extends JFrame implements ActionListener {
JButton usdToEuro;
JButton euroToUsd;
JTextField textField;
public CurrencyCalculator(){
super("Currency Converter");
this.setLayout(new BorderLayout());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
textField = new JTextField(); //"Please enter amount to convert!"
euroToUsd = new JButton("EUR -> USD");
euroToUsd.addActionListener(this);
usdToEuro = new JButton("USD -> EUR");
usdToEuro.addActionListener(this);
JButton cancel = new JButton("Cancel");
cancel.addActionListener(e -> System.exit(0)); // Hier wird diese Form gewählt, da hier nicht wirklich viel Logik drin steht
this.add(textField, BorderLayout.NORTH);
this.add(euroToUsd, BorderLayout.WEST);
this.add(usdToEuro, BorderLayout.CENTER);
this.add(cancel, BorderLayout.EAST);
this.pack();
this.setVisible(true);
this.setLocationRelativeTo(null);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == euroToUsd || e.getSource() == usdToEuro) {
try {
String text = textField.getText();
double number = Double.parseDouble(text);
if (e.getSource() == euroToUsd) {
number = number * 1.09;
} else if (e.getSource() == usdToEuro) {
number = number / 1.09;
}
textField.setText(String.format("%.2f", number));
} catch (Exception ex) {
textField.setText("eine Fehlermeldung");
}
}
}
public static void main(String[] args) {
new CurrencyCalculator();
}
}