[英]How to use setValueAt, when I change cell in column in JTable
我有JTable的行和列,当我用索引4编辑列中的任何单元格时我需要 - >应该在同一行中更改“VALUE”,但是下一列有索引5.我有下一个代码,但它不起作用
table.getModel().addTableModelListener(new TableModelListener() {
public void tableChanged(TableModelEvent e) {
if (table.getSelectedRow()>=0) {
try {
if (table.getSelectedColumn()==4){
table.setValueAt("VALUE", 0, 0);
}
} catch (ArrayIndexOutOfBoundsException ee){
ee.printStackTrace();
}
}
}
});
它有一个错误:
在MainFrame $ 3.tableChanged(MainFrame.java:188)javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source)at javax.swing.table.AbstractTableModel.fireTableCellUpdated(Unknown Source)at javax.swing.table.DefaultTableModel.setValueAt (未知来源)at javax.swing.JTable.setValueAt(Unknown Source)
因为它具有无限循环。 请帮帮我。
您应该更改选定的列和行而不是table.setValueAt("VALUE", 0, 0)
;
table.getModel().addTableModelListener(new TableModelListener() {
public void tableChanged(TableModelEvent e) {
if (table.getSelectedRow()>=0) {
try {
if (table.getSelectedColumn()==4){
table.setValueAt("VALUE", table.getSelectedRow(), 5);
}
} catch (ArrayIndexOutOfBoundsException ee){
ee.printStackTrace();
}
}
}
});
或者你可以尝试如下。 在此示例中,如果您编辑“D”列,则“E”列将更新为“VALUE”。
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class JTableListSelectionListener {
public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JTable table;
String[] columnTitles = { "A", "B", "C", "D", "E" };
Object[][] rowData = { { "11", "12", "13", "14", "" }, { "21", "22", "23", "24", "" },
{ "31", "32", "33", "34", "" }, { "41", "42", "44", "44", "" } };
table = new JTable(rowData, columnTitles);
table.setCellSelectionEnabled(true);
ListSelectionModel cellSelectionModel = table.getSelectionModel();
cellSelectionModel.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
cellSelectionModel.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if(e.getValueIsAdjusting()) {
return;
}
String selectedData = null;
int[] selectedRows = table.getSelectedRows();
int[] selectedColumns = table.getSelectedColumns();
int selectedCol = -1;
int selectedRow = -1;
for (int i = 0; i < selectedRows.length; i++) {
for (int j = 0; j < selectedColumns.length; j++) {
selectedData = (String) table.getValueAt(selectedRows[i], selectedColumns[j]);
selectedCol = selectedColumns[j];
selectedRow = selectedRows[i];
}
}
if(selectedCol == 3) {
table.setValueAt("VALUE", selectedRow, selectedCol+1);
}
System.out.println("Selected: " + selectedData);
}
});
frame.add(new JScrollPane(table));
frame.setSize(300, 200);
frame.setVisible(true);
}
}
对我来说,你的错误与你依赖所选列的事实有关,你应该依赖于事件本身提供的内容,如下所示:
table.getModel().addTableModelListener(new TableModelListener() {
public void tableChanged(TableModelEvent e) {
if (e.getType() == TableModelEvent.UPDATE) {
final int row = e.getFirstRow();
final int column = e.getColumn();
if (column == 4) {
table.setValueAt("VALUE", row, column + 1);
}
}
}
});
看起来第5列依赖于第4列。您可以覆盖setValueAt()
并更新每行中的下一列,如下所示:
@Override
public void setValueAt(Object object, int row, int col) {
super.setValueAt(object, row, col);
int releases = ((Integer) object).intValue();
int tracksToDownload = releases * …;
if (col == 4) {
super.setValueAt(tracksToDownload, row, col + 1);
}
}
我不确定如何计算tracksToDownload
,但您可以使用super.getValueAt()
读取同一行中其他列的值。
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