Java:
package rechner;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
/**
*
* @author jonas
*/
public class Rechner {
static JPanel panel = new JPanel();
static JFrame frame = new JFrame("");
static JButton button0 = new JButton();
static JButton button1 = new JButton();
static JButton button2 = new JButton();
static JButton button3 = new JButton();
static JButton button4 = new JButton();
static JButton button5 = new JButton();
static JButton button6 = new JButton();
static JButton button7 = new JButton();
static JButton button8 = new JButton();
static JButton button9 = new JButton();
static JButton buttonReset = new JButton();
static JButton enterButton = new JButton();
static JButton plusButton = new JButton();
static JButton minusButton = new JButton();
static JButton malButton = new JButton();
static JButton divButton = new JButton();
static JButton pointButton = new JButton();
static JTextArea area = new JTextArea();
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
frame();
}
static void init() {
frame.setTitle("Rechner");
button0.setText("0");
button1.setText("1");
button2.setText("2");
button3.setText("3");
button4.setText("4");
button5.setText("5");
button6.setText("6");
button7.setText("7");
button8.setText("8");
button9.setText("9");
buttonReset.setText("Clear");
enterButton.setText("=");
minusButton.setText("-");
plusButton.setText("+");
malButton.setText("*");
divButton.setText("/");
pointButton.setText(".");
}
static void actions() {
button0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("0");
}
});
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("1");
}
});
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("2");
}
});
button3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("3");
}
});
button4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("4");
}
});
button5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("5");
}
});
button6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("6");
}
});
button7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("7");
}
});
button8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("8");
}
});
button9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("9");
}
});
buttonReset.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.setText("");
}
});
divButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("/");
}
});
malButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("*");
}
});
plusButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("+");
}
});
minusButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append("-");
}
});
pointButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
area.append(".");
}
});
enterButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
double numb;
numb = Double.valueOf(area.getText());
area.setText("= "+numb);
}
});
}
static void frame() {
init();
actions();
frame.add(panel);
panel.setVisible(true);
panel.setSize(580, 500);
panel.add(area);
area.setColumns(41);
panel.add(button0);
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button4);
panel.add(button5);
panel.add(button6);
panel.add(button7);
panel.add(button8);
panel.add(button9);
// panel.add(buttonReset);
panel.add(divButton);
// panel.add(enterButton);
panel.add(malButton);
panel.add(pointButton);
// panel.add(minusButton);
// panel.add(plusButton);
frame.add(buttonReset, BorderLayout.NORTH);
frame.add(plusButton, BorderLayout.EAST);
frame.add(minusButton, BorderLayout.WEST);
frame.add(enterButton, BorderLayout.SOUTH);
frame.setSize(580, 500);
frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}Jedesmal wenn ich auf den gleich button klicke, krieg ich eine NumberFormat Ausnahme in Zeile 188
Ich dachte dass die methode
Java:
double numb = Double.valueOf(area.getText());Dannach
Java:
area.append("= "+numb);
