java swing将背景更改为选定单元格（无列或行）

Question

此代码更改所有列的颜色，我需要在时间更改单个单元格颜色。此代码将创建一个表并安装修改列颜色的TableCellRenderer。它有两个按钮可以执行此操作。代码独自说话。

import java.awt.*; 
    import java.util.Random; 

    import javax.swing.*; 
    import javax.swing.table.*; 
    import java.awt.event.*; 

    public class Board extends JPanel { 

     private static final long serialVersionUID = 1L; 

       int boardHeight = 20; 
       int boardWidth = 10; 

       JTable table; 
       Random random = new Random(); 

       public Board() { 
        setLayout(new BorderLayout()); // !! 
        DefaultTableModel model = new 
        DefaultTableModel(boardHeight, boardWidth) { 
       @Override 
        public Class<?> getColumnClass(int columnIndex) { 
        return String.class; 
        } 
     }; 
    // !! table = new JTable(this.boardHeight, this.boardWidth); 
    table = new JTable(model); 
    for (int row = 0; row < model.getRowCount(); row++) { 
    for (int col = 0; col < model.getColumnCount(); col++) { 
     String s = random.nextBoolean() ? "red" : "yellow"; 
     model.setValueAt(s, row, col); 
    } 
    } 
    //table.setDefaultRenderer(String.class, new BoardTableCellRenderer()); 
    BoardTableCellRenderer mcr = new BoardTableCellRenderer(); 
    table.setFocusable(true); 
    table.setShowGrid(false); 
    table.setRowMargin(0); 
    table.setIntercellSpacing(new Dimension(0, 0)); 
    table.setRowSelectionAllowed(false); 
    table.setFillsViewportHeight(true); 
    table.setVisible(true); 
    //this.add(table); 
    this.setPreferredSize(new Dimension(table.getPreferredSize().width, 
      (table.getPreferredSize().height + 85))); 
    javax.swing.JButton b = new javax.swing.JButton("bottone"); 
    b.addActionListener(new ActionListener() { 
    public void actionPerformed(ActionEvent e) { 
      //table.setDefaultRenderer(String.class, new BoardTableCellRenderer()); 
      table.getColumnModel().getColumn(table.getSelectedColumn()).setCellRenderer(mcr); 
      table.revalidate(); table.repaint(); 
    } 
    }); 
    javax.swing.JButton b1 = new javax.swing.JButton("bottone default"); 
    b1.addActionListener(new ActionListener() { 
    public void actionPerformed(ActionEvent e) { 
      table.setDefaultRenderer(String.class, new DefaultTableCellRenderer()); 
      table.revalidate(); table.repaint(); 
    } 
    }); 

    /*for (int columnIndex = 0; columnIndex < table.getColumnCount(); columnIndex ++) { 
     table.getColumnModel().getColumn(columnIndex).setCellRenderer(mcr); 
    }*/ 
    //JScrollPane p1 = new JScrollPane(); 
    //p1.add(table); 
    add(b, BorderLayout.SOUTH); // e.g. for the button 
    add(b1, BorderLayout.NORTH); // e.g. for the button 

    add(table, BorderLayout.CENTER); // e.g. for the button 

    } 

private static void createAndShowUI() { 
    JFrame frame = new JFrame("Board"); 
    frame.getContentPane().add(new Board()); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.pack(); 
    frame.setLocationRelativeTo(null); 
    frame.setVisible(true); 
} 

    public static void main(String[] args) { 
    java.awt.EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      createAndShowUI(); 
     } 
    }); 
    } 
} 

    class BoardTableCellRenderer extends DefaultTableCellRenderer { 

     private static final long serialVersionUID = 1L; 

     public Component getTableCellRendererComponent(JTable table, 
         Object value, 
     boolean isSelected, boolean hasFocus, int row, int col) { 

    Component c = super.getTableCellRendererComponent(table, value, 
      isSelected, hasFocus, row, col); 
    TableModel t = table.getModel(); 
    Object valueAt = table.getModel().getValueAt(row, col); 
    String s = ""; 
    if (valueAt != null) { 
    s = valueAt.toString(); 
    } 

//if (isSelected) { 
// System.out.println("row: "+row+" "+"col: "+col); 
    if (col == 0 && row == 0) { 
     c.setForeground(Color.YELLOW); 
     c.setBackground(Color.gray); 
    } 
//} 

    /*  if (s.equalsIgnoreCase("yellow")) { 
      c.setForeground(Color.YELLOW); 
      c.setBackground(Color.gray); 
     } else { 
     c.setForeground(Color.black); 
     c.setBackground(Color.WHITE); 
     } 
    */ 
     return c; 
     } 
     } 

Answer 1

此代码改变所有列的颜色，

相同的渲染器用于通过在列中的所有单元格。

所以，你需要的代码是这样的：

if (!isSelected) 
{ 
    if (your special condition) 
    { 
     c.setBackground(...); 
    } 
    else // reset background to the default 
    { 
     c.setBackground(table.getBackground(); 
    } 
}