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public void verzögerung(){
        try{
                Thread.sleep(2000);
            } catch(Exception e) {
            }
    }
    public void actionPerformed(ActionEvent e){
        Object obj = e.getSource();
        
        if(obj == startB){
            for(int i=0; i<10; i++){
                zahlL.setText(""+i);
                verzögerung();
            }