具有布尔数据类型的 JTable 单元格

Question

在我的Jtable中，我有一列boolean值显示为Checkbox。我已经添加了Jtable TableCellRenderer，以下是代码：

TableCellRenderer tableCellBoolean = new DefaultTableCellRenderer() {
        Boolean UserEnterValuse = new Boolean(false);
        public Component getTableCellRendererComponent(JTable table,
                Boolean value, boolean isSelected, boolean hasFocus,
                int row, int column) {
            if (value instanceof Boolean) {
                UserEnterValuse = Boolean.valueOf(value.toString());
                System.out.print(table.getCellRenderer(row, column));
                //InstallmentDate.get
                table.setValueAt(UserEnterValuse, row, column);
            }
            return super.getTableCellRendererComponent(table, value, isSelected,
                    hasFocus, row, column);
        }
    };

我还添加了setCellEditor但是当我单击Jtable单元格时，它会显示Checkbox，在选择或更改单元格中的值后，它根据选择类型显示真或假，但不显示我Checkbox。

如果我不添加TableCellRenderer并且当我将值设置为单元格Jtable时，它会给我错误：Object can not cast to Boolean Type。

Answer 1

首先，

您使用了错误的方法签名。

// wrong
public Component getTableCellRendererComponent(JTable table,
            Boolean value, boolean isSelected, boolean hasFocus,
            int row, int column) {
// correct
public Component getTableCellRendererComponent(JTable table,
            Object value, boolean isSelected, boolean hasFocus,
            int row, int column) {

要显示复选框，您需要在渲染器中扩展复选框。这是布尔值的正确渲染器（它是来自 JTable 源的略微修改的渲染器）。

public class BooleanRenderer extends JCheckBox implements TableCellRenderer {
    private static final Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);
    public BooleanRenderer() {
        super();
        setHorizontalAlignment(JLabel.CENTER);
        setBorderPainted(true);
    }
    public Component getTableCellRendererComponent(JTable table, Object value,
                                                   boolean isSelected, boolean hasFocus, int row, int column) {
        if (isSelected) {
            setForeground(table.getSelectionForeground());
            super.setBackground(table.getSelectionBackground());
        }
        else {
            setForeground(table.getForeground());
            setBackground(table.getBackground());
        }
        setSelected((value != null && ((Boolean)value).booleanValue()));
        if (hasFocus) {
            setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
        } else {
            setBorder(noFocusBorder);
        }
        return this;
    }
}