Java List set Background of list item


How does one change the background color of a Java AWT List item? By that I mean a single item in a AWT List, not the whole thing.


You'll need a custom renderer. That is, if you're using Swing. It's better to stick with the Swing components and not the awt gui components.

JList ... setCellRenderer(new MyCellRenderer()); ... class MyCellRenderer extends DefaultListCellRenderer { public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus); Color bg = <calculated color based on value>; setBackground(bg); setOpaque(true); // otherwise, it's transparent return this; // DefaultListCellRenderer derived from JLabel, DefaultListCellRenderer.getListCellRendererComponent returns this as well. } }


Since Java AWT List inherits from Component, use Component's setBackground(Color c) method.

List coloredList = new List(4, false); Color c = new Color(Color.green); coloredList.add("Hello World") coloredList.setBackground(c);

List now has a color green.


Been a while since I have worked with AWT, but can't you just use setBackground(Color)? List is a subclass of java.awt.Component.