如何在已创建的 JTable 中交替行颜色？

Question

I know how to alternate row color with this code:

JTable table = new JTable(){
public Component prepareRenderer(TableCellRenderer renderer, int row, int column){
    Component returnComp = super.prepareRenderer(renderer, row, column);
    Color alternateColor = Color.YELLOW;
    Color whiteColor = Color.WHITE;
    if (!returnComp.getBackground().equals(getSelectionBackground())){
        Color bg = (row % 2 == 0 ? alternateColor : whiteColor);
        returnComp .setBackground(bg);
        bg = null;
    }
    return returnComp;
};

Now I want to change alternate row color in execution time, (eg click in a button and change alternate row color from Yellow to Gray).

How I can do it?

Answer 1

Make your JTable a full class (instead of an anonymous class as you have in your question), then create a method to do the toggling.

public class AlternatingJTable extends JTable {
  private static final Color ALTERNATE_ONE = Color.YELLOW;
  private static final Color ALTERNATE_TWO = Color.GRAY;

  private Color alternateColor = ALTERNATE_ONE;
  private Color whiteColor = Color.WHITE;

  @Override
  public Component prepareRenderer(TableCellRenderer renderer, int row, int column){
    Component returnComp = super.prepareRenderer(renderer, row, column);

    if (!returnComp.getBackground().equals(getSelectionBackground())){
        Color bg = (row % 2 == 0 ? alternateColor : whiteColor);
        returnComp .setBackground(bg);
        bg = null;
    }
    return returnComp;
  };

  public void toggleAlternateColor() {
    if(this.alternateColor == ALTERNATE_ONE) {
      this.alternateColor = ALTERNATE_TWO;
    } else {
      this.alternateColor = ALTERNATE_ONE;
    }
  }
}

Then, in your actionListener , just do

public void actionPerformed(ActionEvent e) { 
  myAlternatingJTable.toggleAlternateColor();
}