Something

  private void jComboBox1_actionPerformed(ActionEvent e) {        int start;        String ext;        String content = "";        String parser = "-";        jComboBox2.removeAllItems();        File dir=new File(kodBankDBPath);        File[] list=dir.listFiles();        for(int i=0;i<list.length;i++){            // System.out.println(list[i].getName());            start = list[i].getName().indexOf(parser);            ext= list[i].getName().substring(0,start);            int index = jComboBox1.getSelectedIndex();            //JOptionPane.showMessageDialog(this,index);            //JOptionPane.showMessageDialog(this,ext);                        switch (index) {                case 0:                if(ext.equals("php"))                {                    String name = list[i].getName().substring(start+1,list[i].getName().length());                    jComboBox2.addItem(name);                    FileReader fileR;                    try {                        fileR = new FileReader(list[i].getName());                    } catch (FileNotFoundException f) {                        System.out.println(f.getMessage());                    }                    BufferedReader in=new BufferedReader(fileR);                    String line;                    try {                        while((line = in.readLine())!= null) {                        content += line+"\n";                    }                    } catch (IOException f) {                         System.out.println(f.getMessage());                    }                    jTextArea1.setText(content);                }                break;