import java.awt.*;import java.awt.event.*;class Fenster extends Frame implements WindowListener, ActionListener{ //hier war ein Tippfehler TextField t1; TextField t2; TextField t3; public Fenster() { this.setTitle("Titel"); this.setSize(502,502); this.setLocation(400,400); this.setBackground(Color.blue); this.setForeground(Color.white); this.setVisible(true); addWindowListener(this); this.setLayout(new FlowLayout(FlowLayout.LEFT,10,10)); Label l1; l1=new Label("Dies ist ein Text", Label.LEFT); add(l1); t1=new TextField("Hallo"); t1.setColumns(10); add(t1); t2=new TextField("Guten Tag"); t2.setColumns(12); add(t2); t3=new TextField("Guten Tag"); t3.setColumns(12); add(t3); Button b1; //hier war ein Tippfehler b1=new Button("Klick drauf"); b1.setSize(100,25); b1.setLocation(100,100); add(b1); b1.addActionListener(this); Panel panelname = new Panel (); this.add("North", panelname); panelname.add(b1); } public void windowActivated(WindowEvent e){} public void windowClosed(WindowEvent e){} public void windowDeactivated(WindowEvent e){} public void windowDeiconified(WindowEvent e){} //hier war ein Tippfehler public void windowIconified(WindowEvent e){} public void windowClosing (WindowEvent e){ this.setVisible(false); dispose(); System.exit(0); } public void actionPerformed(ActionEvent ae){ //t1.setText("Moin"); String text1=t1.getText(); String text2=t2.getText(); int i = Integer.parseInt(text1); //hier war ein Tippfehler int var1 = Integer.parseInt(text2); int erg =i+var1; String text3=Integer.toString(erg); //hier war ein Tippfehler t3.setText(text3); System.out.println(text1); //hier war ein Tippfehler } public static void main(String[]args){ Fenster fenster1 = new Fenster(); } public void windowOpened(WindowEvent e) {//hier die Implementierung} }