Allows you to supply an ArrayList of colors which corresponds to rows in your JList

ColoredListCellRenderer.java

import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;

/**
 * Allows you to supply an ArrayList of colors which corresponds to rows in your JList
 * Row 3 in the JList has the color at rowColorArrayList.get(3)
 * Null color values result in the default color
 *
 * Usage:
 *  <pre>
 *      myJList.setCellRenderer(new ColoredListCellRenderer(rowColorArrayList));
 *  </pre>
 */

public class ColoredListCellRenderer extends DefaultListCellRenderer {

    private final ArrayList<Color> rowColors;

    public ColoredListCellRenderer(ArrayList<Color> rowColors) {
        this.rowColors = rowColors;
    }

    @Override
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
        Component c = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
        if(rowColors.size() > index) {
            c.setBackground(rowColors.get(index));
        }
        return c;
    }
}