无法在jTable中设置自定义背景色

Question

我使用以下代码来设置jTable中的备用背景行颜色：

table = new JTable(model);
table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer()
{//alternate background color for rows
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,  boolean hasFocus, int row, int column)
    {
        Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        if (!isSelected)
           c.setBackground(row % 2 == 0 ? Color.white : Color.lightGray);
        return c;
    };
});

它是有效的。但是，我想使用自定义颜色（如rgb（242242））代替浅灰色作为替代颜色，但在执行以下操作时：

final Color alternateColor = new Color (242,242,242);
table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer()
{//alternate background color for rows
  public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,    boolean hasFocus, int row, int column)
    {
        Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        if (!isSelected)
           c.setBackground(row % 2 == 0 ? Color.white : alternateColor);
        return c;
    };
});

替代颜色完全被忽略，所有行都有白色背景。看起来此方法仅适用于属于颜色枚举的颜色。怎么会这样？

下面是一个完整的工作示例，随后是结果屏幕：

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

public class Test extends JFrame
{
 private JTable             table               = null;
 private Object[]           columnTitle = { "Column1", "Column2", "Column3" };  
 private Object[][]         data                = null;
 private DefaultTableModel  model               = null;
 private JPanel             panel               = null;
 private JScrollPane        scroller            = null;

 public Test()
    {
        super();
        setLayout(new BorderLayout());
        panel = new JPanel();
        scroller=new JScrollPane();
        data = new Object[3][3];

        for (int i=0; i<3; i++)
            {
                for (int j=0; j<3; j++)
                    {
                        data [i][j]="Test";
                    }
            }

        model = new DefaultTableModel(data, columnTitle);
        table = new JTable(model);
        final Color alternateColor=new Color(242,242,242);
        table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer()
        {//alternate background color for rows
                    @Override
                    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
                            boolean hasFocus, int row, int column)
                        {
                            Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
                            if ( !isSelected )
                                c.setBackground(row % 2 == 0 ? Color.white : alternateColor);
                            return c;
                        };
                });

        scroller.setViewportView(table);
        panel.add(scroller);
        this.add(panel, BorderLayout.CENTER);
    }

public static void main(String[] args)
    {
        javax.swing.SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
                {
                    Test test = new Test();
                    test.setLocationRelativeTo(null);
                    test.pack();
                    test.setVisible(true);
                    test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                }
        });
    }
}

Answer 1

对我来说很好。。。

import com.alee.laf.WebLookAndFeel;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;

public class TestTable {

    public static void main(String[] args) {
        new TestTable();
    }

    public TestTable() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                WebLookAndFeel.install();

                DefaultTableModel model = new DefaultTableModel(new Object[]{"Test"}, 10);
                JTable table = new JTable(model);
                final Color alternateColor = new Color(255, 0, 255);
                table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {//alternate background color for rows
                    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                        Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
                        if (!isSelected) {
                            c.setBackground(row % 2 == 0 ? Color.white : alternateColor);
                        }
                        return c;
                    }
                });
                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new JScrollPane(table));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

}

有可能是其他一些渲染已被使用，渲染器设置为的表不是屏幕上的表。。。许多其他的因素，一个可以运行的例子来证明你的问题会消除。。。

Answer 2

重写渲染器的方法只有在您有数据（即。String）在所有列中使用默认渲染器。如果您的表中有日期或数字数据，需要不同的渲染器，该怎么办？

在本例中，请查看适用于所有数据类型的解决方案的表行呈现。

或者您可以使用：

UIManager.put("Table.alternateRowColor", Color.YELLOW);

不知道这个属性是否适用于所有LAF。