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.
@H_403_12@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); } }@H_403_12@ @H_403_12@