根据列值更改JTable整行的背景颜色

Question

所以我要做的是，根据最后一列内的值更改每行的颜色。

我已经找到了这个解决方案：改变JTable的背景色，效果非常好。

但除此之外，当第四列达到与第二列相同的值时，我想将行的颜色切换为绿色。

我用Cristian Marian的方法写了自己的课

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


        int second = (int) this.getModel().getValueAt(row, 1);
        int forth = (int) this.getModel().getValueAt(row, 3);
        int kat = Kategorie.getNumber((String) this.getModel().getValueAt(row, 2)); 
        if (kat > 0) {
            if (second == forth) {
                comp.setBackground(Color.GREEN);
            } else {
                comp.setBackground(Color.RED);
            }
        }

    return comp;
}

仍然只有每列中的最后一个单元格变为绿色，而不是整个单元格。但是当我在这一行打卡时，整行都会切换颜色

最后一列中的值将由另一帧更改。

当最后一列中的值达到与第二列中相同的值时，如下所示：

Answer 1

import java.awt.Component;
import java.awt.Color;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;

/*
 *
 * This class is the Color Renderer for the "Find All" Button.
 * It basically highlights all of the scripts with a certain color
 * This renderer is responsible Highlighting the JTable.
 * Based on the particular Mark that has been entered in the find all   
 * text field
 *
 *
 */

public class MarkSearchColorCellRenderer extends DefaultTableCellRenderer     
  implements ColorCellRenderer, GradeValidation
{
   public MarkSearchColorCellRenderer(int aMark, Color aColor)
   {
    the_Mark = aMark;
    theColor = aColor;
    }
    @Override
    public Component  getTableCellRendererComponent(JTable table, Object  
       value, boolean isSelected, boolean hasFocus, int row, int column)
    {

        Component cell = super.getTableCellRendererComponent(table,     
                            value, isSelected, hasFocus, row, column);

        setHorizontalAlignment(RIGHT);


        if ( column == 0 ) // script no column
        {
            //check the current Mark within this row
            //i.e. for this particular candidate
            Object curMark =  table.getValueAt(row, column+2);

            //highlight this cell a certain color if the
            //search mark has been found for this particular candidate
            highlightScripts(curMark, cell);
        }
        else if(column == 1) // Candidate No. Column
        {
            Object curMark =  table.getValueAt(row, column+1);

            highlightScripts(curMark, cell);
        }
        else if ( column == 2 ) // mark column
        {
             Object curMark = value;

             highlightScripts(curMark, cell);
        }
        else if (column == 3) // Grade Column
        {
             setHorizontalAlignment(LEFT);

             Object curMark =  table.getValueAt(row, column-1);

             highlightScripts(curMark, cell);
        }
        else if (column == 5) // script no column
        {
            Object curMark =  table.getValueAt(row, column+2);

            highlightScripts(curMark, cell);

        }
        else if( column == 6) // Candidate No. Column
        {
           Object curMark =  table.getValueAt(row, column+1);

           highlightScripts(curMark, cell);
        }
        else if ( column == 7) // mark column
        {
            Object curMark = value;

            highlightScripts(curMark, cell);

         }
         else if ( column == 8) // Grade Column
         {
            setHorizontalAlignment(LEFT);

             Object curMark =  table.getValueAt(row, column-1);

             highlightScripts(curMark, cell);

         }
         else
         {
             // Should never arrive here.
             // If it does, then you've rendered a column that may not
             // function with this class
             // therefore, I'm going to exit the program

              //System.exit(0);
         }

         table.repaint();

         return cell;

     } // end getTableCellRendererComponent()

     // Change the color of this cell if the aValue matches
     // the value within the particular cell
     private void highlightScripts(Object aValue, Component aCell)
     {
         Object value = aValue;
         Component cell = aCell;

         if ( value != null )
         {
             if (value instanceof Integer )
             {
                Integer amount = (Integer) value;

                if( amount.intValue() == the_Mark )
                {
                    cell.setBackground( theColor );

                 }
                 else
                 {
                     cell.setBackground( Color.white );

                 }
             }
         }
         else
         {
            cell.setBackground( Color.white );
         }
      }// end highlightScripts()

}//end class
				


                
 

                
 
            

Answer 2

您的方法的问题是，您使用getTableCellRendererComponent，因此只有该单元格会更改其颜色。

我必须做一些类似的东西。根据列的值，我必须给行上色。

我使用了一个类来扩展JTable并覆盖prepareRenderer

@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
    Component comp = super.prepareRenderer(renderer, row, column);
    if (populated) {  //this if was just to make sure that I have data in my table
        /*
        *This piece makes the code ignore the rows that are selected as this approach messes up that blue color that selected rows get
        */
        int[] rows = this.getSelectedRows();
        boolean rowisSelected = false;

        for (int rowIndex : rows) {
            if (row == rowIndex) {
                rowisSelected = true;
                break;
            }
        }
        /*
        *And this is the part that does the coloring
        */
        if (!rowisSelected) {
            Integer status = Integer.parseInt((String) 
            int modelRow = convertRowIndexToModel(row);
            this.getModel().getValueAt(modelRow, Constants.HIDDEN_COLUMN));
            switch (status) {
            case 1:
                comp.setForeground(Color.BLACK);
                comp.setBackground(Color.WHITE);
                break;
            case 2:
                comp.setForeground(Color.LIGHT_GRAY);
                comp.setBackground(Color.WHITE);
                break;
            case 3:
                comp.setForeground(Color.BLACK);
                comp.setBackground(Constants.DOWNLOADED_COLOR);
                break;
            case 4:
                comp.setForeground(Color.LIGHT_GRAY);
                comp.setBackground(Constants.DOWNLOADED_COLOR);
                break;
            }
        }
    }
    return comp;
}

您的行应该是这样的（没有选中的行）：

@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
    Component comp = super.prepareRenderer(renderer, row, column);
    int modelRow = convertRowIndexToModel(row);
    String second = this.getModel().getValueAt(modelRow, 1));
    String forth= this.getModel().getValueAt(modelRow, 3));
    if(second.equals(forth)){
        comp.setBackground(Color.GREEN);
    }
    return comp;
}