我有一个使用DefaultTableModel的JTable,当用户点击列标题时,我允许进行排序.但是,当用户单击具有整数类型数据的列的标题时,它不能正确排序.看起来它是通过String排序而不是整型类型.
DefaultTableModel aModel = (DefaultTableModel) mainView.logEntryTable.getModel();
ResultSetMetaData rsmd; try {
mainView.logEntriesTableModel.setRowCount(0);
rsmd = rs.getMetaData();
int colNo = rsmd.getColumnCount();
while(rs.next()){
Object[] objects = new Object[colNo];
for(int i=0;i<colNo;i++){
objects[i]=rs.getObject(i+1);
}
aModel.addRow(objects);
count++;
}
mainView.logEntryTable.setModel(aModel);
mainView.logEntryTable.getColumnModel().getColumn(0).setMaxWidth(80);
所以我试图重写这个方法,最终结束了：
@Override
public Class<?> getColumnClass(int columnIndex){
if( columnIndex == 0){
// Return the column class for the integer column
}else{
// Return the column class like we normally would have if we didn't override this method
}
return null;
}
};
我从来没有超过这个,我不太清楚我期望在这里做什么.
解决方法
尝试这个小例子.
更好的方法
如Kleopatra所建议的,定义与每个列相关的列类将足以使数据被正确排序.
import javax.swing.*;
import javax.swing.table.*;
import java.util.Comparator;
class TableSorting {
public static void main(String[] args) {
Object[][] data = {
{new Integer(1),"Don't Let Go",new Integer(179)},{new Integer(2),"Photograph",new Integer(29)},{new Integer(3),"Hash Pipe",new Integer(186)},{new Integer(4),"Island In The Sun",new Integer(200)},{new Integer(5),"Crab",new Integer(154)},{new Integer(6),"Knock-Down Drag-Out",new Integer(128)},{new Integer(7),"Smile",new Integer(158)},{new Integer(8),"Simple Pages",new Integer(176)},{new Integer(9),"GlorIoUs Day",new Integer(160)},{new Integer(10),"O Girlfriend",new Integer(230)}
};
Object[] columns = {"Track #","Title","Length"};
DefaultTableModel model = new DefaultTableModel(data,columns) {
@Override
public Class getColumnClass(int column) {
switch (column) {
case 0:
return Integer.class;
case 1:
return String.class;
case 2:
return Integer.class;
default:
return String.class;
}
}
};
JTable table = new JTable(model);
JScrollPane scroll = new JScrollPane(table);
table.setAutoCreateRowSorter(true);
JOptionPane.showMessageDialog(null,scroll);
}
}
原来,用比较器
import javax.swing.*;
import javax.swing.table.*;
import java.util.Comparator;
class TableSorting {
public static void main(String[] args) {
Object[][] data = {
{new Integer(1),"Length"};
JTable table = new JTable(data,columns);
JScrollPane scroll = new JScrollPane(table);
DefaultTableModel model = new DefaultTableModel(data,columns);
TableRowSorter trs = new TableRowSorter(model);
class IntComparator implements Comparator {
public int compare(Object o1,Object o2) {
Integer int1 = (Integer)o1;
Integer int2 = (Integer)o2;
return int1.compareTo(int2);
}
public boolean equals(Object o2) {
return this.equals(o2);
}
}
trs.setComparator(0,new IntComparator());
table.setRowSorter(trs);
scroll = new JScrollPane(table);
table.setAutoCreateRowSorter(false);
JOptionPane.showMessageDialog(null,scroll);
}
}
