Question

JTable中如果某字段为数值，如何按数值进行排序？

jdk1.6中已支持JTable按某一字段进行排序，但在默认情况下DefaultTableModal的列是Object类型。如何使某一数值型字段按照数值大小进行排序，谢谢。先悬赏50分以示诚意，解决了问题，会再加50分。

Answer 1

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;

public class JTableSortDemo {
public static void main(String[] args) {
Object[][] data = { { "A", 5 }, { "B", 2 }, { "C", 4 }, { "D", 8 } };
String columnNames[] = { "Item", "Value" };
TableModel model = new DefaultTableModel(data, columnNames) {
public Class<?> getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
JTable table = new JTable(model);

TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(model);
table.setRowSorter(sorter);

JScrollPane scrollPane = new JScrollPane(table);
JFrame frame = new JFrame("Sorting Table");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(scrollPane);
frame.setSize(300, 200);
frame.setVisible(true);
}
}