private void jTextField1KeyPressed(java.awt.event.KeyEvent evt) {                                       
        // TODO add your handling code here:
        jLabel1.setText("Sự kiện phím:  Key Pressed");
        String t = jTextField1.getText();
        if(evt.getKeyCode()==KeyEvent.VK_ENTER && t.length()>0)
        {
            jTextArea1.setText(jTextArea1.getText()+"\n"+t);
            jTextField1.setText(null);
        }
        
        if(evt.getKeyChar()== 'e' && evt.getKeyCode()== KeyEvent.VK_ENTER) 
            System.exit(0);
    }       
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