Question

我的GUI中有一个（或多或少）空JTable，开头没有任何JCheckBox。按下按钮后，我想根据数组的内容用名称（字符串）和JCheckBoxes填充表格。具有名称的部分已经正常工作，但是我无法将单个单元格的类更改为布尔值，而是在JutckBox实际应该在的JTable中出现true或false。我知道如果在开头将列类型设置为boolean，则可以用JCheckBoxes填充完整的列。

我现在的问题是，是否可以更改单个单元格的列类型。

这是创建JTable的代码：

    table = new JTable();
    table.setRowMargin(3);
    table.setRowHeight(25);
    table.setFillsViewportHeight(true);
    table.setModel(new DefaultTableModel(
            new Object[][] {
                {null, "Monday", "Tuesday", "Wednesday", "Thursday", "Friday"},
                {"", "2016-02-29", "2016-03-01", "2016-03-02", "2016-03-03", "2016-03-04"},
                {" 1. Lesson", null, null, null, null, null},
                {" 2. Lesson", null, null, null, null, null},
                {" 3. Lesson", null, null, null, null, null},
                {" 4. Lesson", null, null, null, null, null},
                {" 5. Lesson", null, null, null, null, null},
                {" 6. Lesson", null, null, null, null, null},
                {" 7. Lesson", null, null, null, null, null},
                {" 8. Lesson", null, null, null, null, null},
                {" 9. Lesson", null, null, null, null, null},
                {" 10. Lesson", null, null, null, null, null},
            },
            new String[] { "Empty", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday" }
        ) 
        {
            Class[] columnTypes = new Class[] 
                {
                    String.class, Object.class, Object.class, Object.class, Object.class, Object.class
                };
            public Class getColumnClass(int columnIndex) 
            {
                return columnTypes[columnIndex];
            }
        });
    table.setBorder(new LineBorder(new Color(0, 0, 0)));
    table.setBounds(381, 11, 518, 300);
    panel.add(table);

这是JTable内容发生变化的部分：

public void tableUpdate(Object[][] a)
{
    for(int row = 0; row < 11; row++)
    {
        for(int column = 0 ; column < 5; column++)
        {
            table.setValueAt(a[column][row], row+1, column+1);

        }
    }
}

如果您需要进一步的信息，请提前问我并多多谢意。

Answer 1

你可以这样做：

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

public class TablePropertyEditor extends JFrame
{
    public TablePropertyEditor()
    {
        String[] columnNames = {"Type", "Value"};
        Object[][] data =
        {
            {"String", "I'm a string"},
            {"Date", new Date()},
            {"Integer", new Integer(123)},
            {"Double", new Double(123.45)},
            {"Boolean", Boolean.TRUE}
        };

        JTable table = new JTable(data, columnNames)
        {
            private Class editingClass;

            public TableCellRenderer getCellRenderer(int row, int column)
            {
                editingClass = null;
                int modelColumn = convertColumnIndexToModel(column);

                if (modelColumn == 1)
                {
                    Class rowClass = getModel().getValueAt(row, modelColumn).getClass();
                    return getDefaultRenderer( rowClass );
                }
                else
                    return super.getCellRenderer(row, column);
            }

            public TableCellEditor getCellEditor(int row, int column)
            {
                editingClass = null;
                int modelColumn = convertColumnIndexToModel(column);

                if (modelColumn == 1)
                {
                    editingClass = getModel().getValueAt(row, modelColumn).getClass();
                    return getDefaultEditor( editingClass );
                }
                else
                    return super.getCellEditor(row, column);
            }

            //  This method is also invoked by the editor when the value in the editor
            //  component is saved in the TableModel. The class was saved when the
            //  editor was invoked so the proper class can be created.

            public Class getColumnClass(int column)
            {
                return editingClass != null ? editingClass : super.getColumnClass(column);
            }
        };

        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );
    }

    public static void main(String[] args)
    {
        TablePropertyEditor frame = new TablePropertyEditor();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }
}

它根据单元格中的数据而不是列类确定要使用的渲染器/编辑器。

如何将JTable单元的类更改为JCheckBox？

1 个答案: