java 在netbeans中填充JTable中的数据
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Filling data in JTable in netbeans
提问by Harshveer Singh
I want to change default data in JTable at runtime. I am using netbeans. I tried solution given here adding data to JTable when working with netbeans
我想在运行时更改 JTable 中的默认数据。我正在使用 netbeans。我尝试了此处给出的解决方案，在使用 netbeans 时将数据添加到 JTable
jTable1.getModel().setValueAt(row, column, value);
jTable1.getModel().setValueAt(row, column, value);
but it gives me this error:
但它给了我这个错误：
回答by Captain Giraffe
If you want to change it at runtime you need to decide whenyou want it changed and add the code to the proper method/event. As it stands you have a method call in your class definition, which is not valid code.
如果您想在运行时更改它，您需要决定何时更改并将代码添加到正确的方法/事件中。就目前而言，您的类定义中有一个方法调用，这是无效的代码。
For instance
例如
public void setTableModel(){
displayTable.getModel().setValueAt(2,4,300);
}
And then call setTableModel() at an appropriate time.
然后在适当的时候调用 setTableModel()。
回答by mKorbel
because you wrote this code line out of current Class, you have to wrap these code line(s) inside Class/void/constructor, for example
因为您在当前类之外编写了此代码行，因此您必须将这些代码行包装在 Class/void/constructor 中，例如
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class TableProcessing extends JFrame implements TableModelListener {
private static final long serialVersionUID = 1L;
private JTable table;
public TableProcessing() {
String[] columnNames = {"Item", "Quantity", "Price", "Cost"};
Object[][] data = {
{"Bread", new Integer(1), new Double(1.11), new Double(1.11)},
{"Milk", new Integer(1), new Double(2.22), new Double(2.22)},
{"Tea", new Integer(1), new Double(3.33), new Double(3.33)},
{"Cofee", new Integer(1), new Double(4.44), new Double(4.44)}
};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
model.addTableModelListener(this);
table = new JTable(model) {
private static final long serialVersionUID = 1L;
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
@Override
public boolean isCellEditable(int row, int column) {
int modelColumn = convertColumnIndexToModel(column);
return (modelColumn == 3) ? false : true;
}
};
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane(table);
getContentPane().add(scrollPane);
}
@Override
public void tableChanged(TableModelEvent e) {
if (e.getType() == TableModelEvent.UPDATE) {
int row = e.getFirstRow();
int column = e.getColumn();
System.out.println(row + " : " + column);
if (column == 1 || column == 2) {
int quantity = ((Integer) table.getModel().getValueAt(row, 1)).intValue();
double price = ((Double) table.getModel().getValueAt(row, 2)).doubleValue();
Double value = new Double(quantity * price);
table.getModel().setValueAt(value, row, 3);
}
}
}
public static void main(String[] args) {
TableProcessing frame = new TableProcessing();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
