请看下面的代码
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.table.*;
public class TableBasic extends JFrame
{
public TableBasic()
{
String[] columnNames = {"Date","String","Long","Boolean"};
Object[][] data =
{
{getJavaDate("13-11-2020"),"A",new Long(1),Boolean.TRUE },{getJavaDate("13-11-2018"),"B",new Long(2),Boolean.FALSE},{getJavaDate("12-11-2015"),"C",new Long(9),"D",new Long(4),Boolean.FALSE}
};
final JTable table = new JTable(data,columnNames);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
table.setautocreateRowSorter(true);
table.getColumnModel().getColumn(0).setCellRenderer(tableCellRenderer);
// DefaultRowSorter has the sort() method
DefaultRowSorter sorter = ((DefaultRowSorter)table.getRowSorter());
ArrayList list = new ArrayList();
list.add( new RowSorter.sortKey(0,SortOrder.DESCENDING) );
sorter.setSortKeys(list);
sorter.sort();
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
}
private TableCellRenderer tableCellRenderer = new DefaultTableCellRenderer()
{
SimpleDateFormat f = new SimpleDateFormat("dd-MM-yyyy");
public Component getTableCellRendererComponent(JTable table,Object value,boolean isSelected,boolean hasFocus,int row,int column)
{
if( value instanceof Date)
{
value = f.format(value);
}
return super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
}
};
private Date getJavaDate(String s)
{
try {
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
Date d = sdf.parse(s);
return d;
} catch (ParseException ex) {
Logger.getLogger(TableBasic.class.getName()).log(Level.SEVERE,null,ex);
return null;
}
}
public static void main(String[] args)
{
TableBasic frame = new TableBasic();
frame.setDefaultCloSEOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setLocationRelativeto( null );
frame.setVisible(true);
}
}
现在,尝试使用Date字段对其进行排序.它以无效的方式排序！以下是结果！
为什么会这样发生？我甚至用过细胞渲染！
解决方法
@Sciper不是一个回答,但我无法抗拒,因为你的代码非常复杂,设计错误,错过了需要的轻量级…
缺少的关键元素是覆盖TableModel.getColumnClass(),这对于表排序功能至关重要
import java.awt.*;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.table.*;
public class TableBasic {
private JFrame frame = new JFrame();
private String[] columnNames = {"Date","Boolean"};
private Object[][] data = {
{getJavaDate("13-11-2020"),new Double(1),Boolean.TRUE},new Double(2),new Double(9),new Double(4),Boolean.FALSE}
};
private DefaultTableModel model = new DefaultTableModel(data,columnNames) {
@Override
public Class<?> getColumnClass(int column) {
return getValueAt(0,column).getClass();
}
};
private JTable table = new JTable(model);
private JScrollPane scrollPane = new JScrollPane(table);
private static final DateFormat DATE_FORMAT = new SimpleDateFormat("dd/MM/yyyy");
public TableBasic() {
table.setPreferredScrollableViewportSize(table.getPreferredSize());
table.setautocreateRowSorter(true);
setRenderers();
// DefaultRowSorter has the sort() method
table.getRowSorter().toggleSortOrder(0);
frame.add(scrollPane);
frame.setDefaultCloSEOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeto(null);
frame.setVisible(true);
}
private void setRenderers() {
//TableColumnModel m = table.getColumnModel();
//"Integer","Interger","Double","Boolean","Date"
table.setDefaultRenderer(Date.class,new DateRenderer());
}
private Date getJavaDate(String s) {
try {
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
Date d = sdf.parse(s);
return d;
} catch (ParseException ex) {
Logger.getLogger(TableBasic.class.getName()).log(Level.SEVERE,ex);
return null;
}
}
public static void main(String[] args) {
EventQueue.invokelater(new Runnable() {
@Override
public void run() {
TableBasic frame = new TableBasic();
}
});
}
private class DateRenderer extends DefaultTableCellRenderer {
private static final long serialVersionUID = 1L;
@Override
public Component getTableCellRendererComponent(JTable table,int column) {
super.getTableCellRendererComponent(table,column);
if (!(value instanceof Date)) {
return this;
}
setText(DATE_FORMAT.format((Date) value));
return this;
}
}
}