Why is a boolean value in JTable showing as true/false instead of a checkbox?

问题

Shouldn't the new Boolean appear as a checkbox? It's showing up as a true/false string value instead. This is how I'm populating the data:

    Object[] columnNames4 = {"Name", "City", "Checkbox"};
    Object[][] data = {
    {"john smith",
     "x", new Boolean(false)},
    {"jenny m",
     "y", new Boolean(false)}
     };
    JTable table4 = new JTable(data, columnNames4);
    JScrollPane S3 = new JScrollPane(table4);
    S3.setPreferredSize(new Dimension(300, 300));

回答1:

Create a subclass ofAbstractTableModel and return Boolean.class in the Method getColumnClass() for the column you want.

回答2:

You need to setup a TableCellRenderer and TableCellEditor

see http://docs.oracle.com/javase/tutorial/uiswing/components/table.html

Once you have defined the render's / editor's you can

define the render/editor as the default render for a Type table.setDefaultRenderer(Boolean.class, new MyBooleanRender()); table.setDefaultEditor(Boolean.class, new MyBooleanCellEditor());
define the render / editor to a column TableColumnModel tcm = table.getColumnModel(); tcm.getColumn(4).setCellRenderer(new MyBooleanRender()); tcm.getColumn(4).setCellEditor(new MyBooleanCellEditor());

You can define a checkbox cellRender like:

public class MyBooleanRender extends JCheckBox
implements TableCellRenderer {

private JCheckBox checkBox = this;

/**
 * @see javax.swing.table.TableCellRenderer#getTableCellRendererComponent
 * (javax.swing.JTable, java.lang.Object, boolean, boolean, int, int)
 */
public Component getTableCellRendererComponent(
    JTable tbl,
    Object value,
    boolean isSelected,
    boolean hasFocus,
    int row,
    int column) {
    boolean val = false;

    if (Common.isEmpty(value)) {
        checkBox.setSelected(false);
    } else {

        try {
            val = ((Boolean) value).booleanValue();
        } catch (Exception e) {
        }
        checkBox.setSelected(val);
    }  

    if (Common.OPTIONS.highlightEmpty.isSelected() && value == Common.MISSING_VALUE) {
        checkBox.setBackground(Common.EMPTY_COLOR);
    } else if (value == Common.MISSING_REQUIRED_VALUE) {
        checkBox.setBackground(Common.MISSING_COLOR);
    } else {
        ...
    }

    checkBox.setSelected(val);
    return checkBox;
}
}

For a checkboxEditor, you can use the DefaultCellEditor class.

来源：https://stackoverflow.com/questions/27882454/why-is-a-boolean-value-in-jtable-showing-as-true-false-instead-of-a-checkbox

标签

java

jtable

jcheckbox