java - 计算列的总和并将其放入 jtable 中

Question

如何计算jTable中价格列的总和并将它们的总和放在jTable的末尾。你能给我一个示例代码吗？

public class IncomeReport extends JFrame {

private AccountFacade service = new AccountFacade();

void init() {

    String[] columnNames = {"مبلغ", "محل درآمد ", "منبع"};

    List list = service.incomeReportFacade();

    Object[][] model = new Object[list.size()][];
    for (int i = 0; i < list.size(); i++) {
        model[i] = (Object[]) list.get(i);
    }

    JTable table = new JTable(model, columnNames) {


        DefaultTableCellRenderer renderRight = new DefaultTableCellRenderer();

        {
            // initializer block
            renderRight.setHorizontalAlignment(SwingConstants.RIGHT);
        }

        @Override
        public TableCellRenderer getCellRenderer(int arg0, int arg1) {
            return renderRight;
        }

    };

Answer 1

尝试这样的事情。获取型号，然后使用DefaultTableModel#getValueAt()方法。

Jtable table = new Jtable();
DefaultTableModel model = (DefaultTableModel)table.getModel();

double total = 0;
int column = 2;  // example

for (int i = 0; i < model.getRowCount(); i++){
    total += model.getValueAt(i, column);        // getValueAt(row, column)
}

Object[] row = {"", "", total};
model.addRow(row);