title: I want to append JList selected items to Jtextfield
body: <p>When I Select a value from Jlist, I want to append it to the Jtextfield without replacing existing values,
  This is what I tried So far, As you can see this is replacing existing value</p>
  
  <pre><code>    jlist.addListSelectionListener(new ListSelectionListener() {
  
          @Override
          public void valueChanged(ListSelectionEvent arg0) {
              if (!arg0.getValueIsAdjusting()) {
                  textField.setText(jlist.getSelectedValue());
  
              }
          }
  </code></pre>
  
  <p>please help me to solve this problem </p>