如何为JComboBox中的项目分配不同的颜色？

Question

I have a JComboBox and have 10 string items added in it. I want to assign different colors to each item. How i can achive this? Please help.

Answer 1

The example in Chandru's answer looks like a lot of code so I can understand why you're asking for an easier solution. However, if you subclass DefaultListCellRenderer a lot of the work is done for you, as this renderer is a subclass of JLabel .

JList list = ... // Create JList

// Install custom renderer.
list.setCellRenderer(new DefaultListCellRenderer() {
  public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {

    // Request superclass to render the JLabel.
    Component ret = super.getListCellRenderer(list, value, index, isSelected, cellHasFocus);

    // Now conditionally override background if cell isn't selected.
    if (!isSelected) {
      String s = String.valueOf(value);

      if (s.equals("Foo")) {
        ret.setBackground(Color.RED);
      } else {
        ret.setBackground(Color.GREEN);
      }
    }

    return ret;
  }
});

Answer 2

You must use a custom list cell renderer. Look into this how-to for an example.

Answer 3

You must implement a new ListCellRenderer ,which will be used by your combobox, through setRenderer , to render properly your objects.

You can extend BasicComboBoxRenderer to avoid reconding everything.