我创建了一个带有表模型的 JTable 。现在,根据我所拥有的输入,我想将一列设置为特定的数据类型。我该怎么做?
import java.awt.GridLayout;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.AbstractTableModel;
public class MyTableModelTwo extends AbstractTableModel {
private static final long serialVersionUID = 1L;
private Object[][] data;
private String[] columnNames;
public MyTableModelTwo(Object[][] data) {
this.data = data;
}
@Override
public int getRowCount() {
return data.length;
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
}
@Override
public Class<?> getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
@Override
public boolean isCellEditable(int rowIndes, int columnIndex) {
return true;
}
@Override
public String getColumnName(int index) {
return columnNames[index];
}
@Override
public void setValueAt(Object value, int rowIndex, int columnIndex) {
data[rowIndex][columnIndex] = value;
fireTableCellUpdated(rowIndex, columnIndex);
}
public MyTableModelTwo(String[] columnNames, Object[][] data) {
this.columnNames = columnNames;
this.data = data;
}
}
class MyTableTwo extends JPanel implements TableModelListener {
private static final long serialVersionUID = 1L;
private JTable table;
private Object[][] data;
private JTextField t;
public MyTableTwo(int noElements, String[] columnNames) {
data = new Object[noElements][columnNames.length];
t = new JTextField();
MyTableModelTwo m = new MyTableModelTwo(columnNames, data);
table = new JTable(m);
table.getModel().addTableModelListener(this);
setLayout(new GridLayout(1, 0));
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
}
@Override
public void tableChanged(TableModelEvent e) {
}
public JTextField returnT6() {
return t;
}
}
覆盖 public Class getColumnClass(int column) {...
请问我的问题,为什么你需要 AbstractModel,出于为什么原因,你真正想要限制/修改/更改/覆盖什么,(
you can prety ignore this == be sure that not really not good way to start to playing with anything for JTable based on AbstractTableModel
),但是......考虑使用 DefalutTableModel 而不是 AbstractTableModel
注意: 列确实有数据类型。添加至少 1 行后运行此操作。
System.out.println("Column Types : " + table.getColumnClass(0) + " " + table.getColumnClass(1) + " " + table.getColumnClass(2) );
使用排序时,列类很重要: table.setAutoCreateRowSorter(true);
如果列类是字符串,但包含数字,则它们按字母顺序而不是数字顺序排序。 如果您将混合数据类型放入列中(例如字符串和整数)并尝试排序,排序会失败并且您会收到很多错误消息。
我的观点是正确的,但我不相信 JTable 中的列(或单元格)有任何数据类型的概念。您最好检查预期的整数,否则抛出异常。例如:
try{
Integer.parseInt(myTableCellValue);
}catch(ParseException e){
//Not a valid integer
}