0

我有一些从我的数据库加载并作为公共静态列表存储在另一个类中的数据，我无法在 MyTableModel 类中访问我的数据以在 jtable 中存储和查看它们......还有许多其他方法存在用我的数据填充表格，但他们没有给我列复选框sh...我该怎么办？

    class MyTableModel extends AbstractTableModel {
    private String[] columnNames = {"UserName","Admin","Blocked"};
    private Object[Size][3] data;
    //size is an variable thing witch i get it from db,uses as number of the row;
    public int getColumnCount() {
       return columnNames.length;
    }

    public int getRowCount() {
       return data.length;
    }

    public String getColumnName(int col) {
       return columnNames[col];
    }

    public Object getValueAt(int row, int col) {
       return data[row][col];
    }

    public Class getColumnClass(int c) {
       return getValueAt(0, c).getClass();
    }

    public boolean isCellEditable(int row, int col) {
        if (col < 2) {
           return false;
        } else {
           return true;
        }
    }

    public void setValueAt(Object value, int row, int col) {
        data[row][col] = value;
        fireTableCellUpdated(row, col);
    }

    }
4

1 回答 1

5

您应该避免使用object.getClass()返回列的类类型。如果该值恰好是null数据集中的唯一值，会发生什么？

相反，你应该传回实际的列类......（nb如果没有你实际的数据，我不知道应该传递什么值，所以这只是一个例子......）

public Class getColumnClass(int c) {
    return c < 2 ? String.class : Boolean.class;
}

更新

为了JTable显示 a JCheckBox，表模型必须Boolean从模型getColumnClass方法返回......这是最简单的解决方案，然后再次，您可以简单地为特定列提供自定义单元格渲染器。

在此处输入图像描述

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;

public class TestTable11 {

    public static void main(String[] args) {
        new TestTable11();
    }

    public TestTable11() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                TableModel model = new SimpleTableModel();

                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new JScrollPane(new JTable(model)));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class SimpleTableModel extends AbstractTableModel {

        private List<Object[]> rows;

        public SimpleTableModel() {
            rows = new ArrayList<>(5);
            rows.add(new Object[]{"Test1", "Test2", false});
            rows.add(new Object[]{"Test3", "Test4", false});
            rows.add(new Object[]{"Test5", "Test6", false});
            rows.add(new Object[]{"Test7", "Test8", false});
            rows.add(new Object[]{"Test9", "Test10", false});
            rows.add(new Object[]{"Test11", "Test11", false});
        }

        @Override
        public int getRowCount() {
            return rows.size();
        }

        @Override
        public int getColumnCount() {
            return 3;
        }

        @Override
        public Object getValueAt(int rowIndex, int columnIndex) {
            return rows.get(rowIndex)[columnIndex];
        }

        @Override
        public boolean isCellEditable(int rowIndex, int columnIndex) {
            return columnIndex == 2;
        }

        @Override
        public Class<?> getColumnClass(int columnIndex) {
            return columnIndex < 2 ? String.class : Boolean.class;
        }

        @Override
        public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
            if (columnIndex == 2 && aValue instanceof Boolean) {
                rows.get(rowIndex)[columnIndex] = aValue;
            }
        }        
    }    
}
于 2013-06-26T07:01:35.613 回答