title: How to get text from JComboBox?
body: <p>I have a problem with getting text from selected position of JComboBox. I tried to use getSelectedItem method in class which extends Kodowanie.java, but i get null value and i can't find out why. Method (getSelectedItem) works in Kodowanie class I can easily get text form JComboBox . </p>
  
  <p><strong>Kodowanie.java</strong></p>
  
  <pre><code>   public class Kodowanie {
  
          //Skladowe:
          ArrayList &lt;String&gt; qweqwe; 
          JComboBox inputCode = new JComboBox();  //HERE IS MY INPUT COMBOBOX
          JComboBox outputCode = new JComboBox();
          JTextArea input;
          JTextArea output;
  
      public void createGUI(){
  
          JFrame frame = new JFrame("Code");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
          input  = new JTextArea(); 
          output = new JTextArea();
  
          qweqwe = new ArrayList&lt;&gt;();
          napelnijTalbiceCharsetami(qweqwe); //METHOD WHICH ADD ALL CHARSETS TO LIST
  
          inputCode = new JComboBox(qweqwe.toArray());
          outputCode = new JComboBox(qweqwe.toArray());
  
          JScrollPane scrollPaneInput = new JScrollPane(input, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
          JScrollPane scrollPaneOutput = new JScrollPane(output, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
  
          scrollPaneInput.setBorder(BorderFactory.createTitledBorder("Input Path"));
          scrollPaneOutput.setBorder(BorderFactory.createTitledBorder("Output Path"));
  
          inputCode.setPreferredSize(new Dimension(400,50));
          outputCode.setPreferredSize(new Dimension(400,50));
  
          scrollPaneInput.setPreferredSize(new Dimension(400, 100));
          scrollPaneOutput.setPreferredSize(new Dimension(400, 100));
  
          input.addKeyListener(new KeyAdapter() {
               public void keyPressed(KeyEvent evt){  
                      Strumieniowanie tmp;
                      if(evt.getKeyCode() == KeyEvent.VK_ENTER)
                      {
                          try {
                              tmp = new Strumieniowanie(input.getText(), output.getText());
                          } catch (IOException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                          }
                      }
                  }
          });
  
          frame.getContentPane().add(scrollPaneInput);
          frame.getContentPane().add(scrollPaneOutput);
          frame.getContentPane().add(inputCode);
          frame.getContentPane().add(outputCode);
  
          frame.setLayout(new  FlowLayout());
          frame.setPreferredSize(new Dimension(850, 220));
          frame.setVisible(true);
          frame.pack();
  
      }
  
      private ArrayList napelnijTalbiceCharsetami(ArrayList tmp){
          Map charSets = Charset.availableCharsets();
          Iterator iterator = charSets.keySet().iterator();
          while (iterator.hasNext()) {
              System.out.println(iterator.next().toString());
              tmp.add(iterator.next().toString());
          }
          return tmp;
      }
  
  
  
      public static void main(String[] args) {
          // TODO Auto-generated method stub
          Kodowanie l = new Kodowanie();
          l.createGUI();
      }
  
  
  
  }
  </code></pre>
  
  <p><strong>Strumieniowanie.java</strong></p>
  
  <pre><code>public class Strumieniowanie extends Kodowanie {
  
      protected boolean pathInputOk = false;
      protected boolean pathOutputOk = false;
  
  public Strumieniowanie(String tmpInpute, String tmpOutput) throws IOException {
  
  
      File plikInput = new File(tmpInpute);
      File plikOutput = new File(tmpOutput);
  
      String inputText;
      inputText =  (String) inputCode.getSelectedItem(); //HERE I TRY TO GET STRING FROM JCOMBOBOX BUT IT IS ALWAYS NULL !
      System.out.println(inputText);
  
      pathInputOk = plikInput.isFile();
      pathOutputOk = plikOutput.isFile();
  
      System.out.println(pathInputOk);
      System.out.println(pathOutputOk);
  
      if (pathInputOk &amp;&amp; pathOutputOk) {
          File nowyPlik = new File(tmpInpute);
  
          FileInputStream fis = new FileInputStream(nowyPlik);
  
          fis.close();
  
      }
  
  }
  
  protected boolean isItaPath(File plik) {
      boolean tmp = 
  
  false;
          tmp = plik.isFile();
  
          return tmp;
      }
  
  
  }
  </code></pre>