在JTable

Question

我从用户输入创建JTable。 GUI中有一系列单选按钮，当选择一个时，它需要更新表中列的所有值。

我得到一个arrayIndexOutofBounds错误。不完全确定我做错了什么。任何输入都会受到赞赏，因为这是我第一次使用jtable，它比我想象的更难。

我收到错误的代码：

class RadioListener implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {                                   
        if(oneRadio.isSelected())
        {
            payAMT = payAMT * .01;
            for(int i = 1; i < outputTable.getRowCount(); i++)
            {
                outputTable.setValueAt(payAMT,i,4);
            }

        }

代码：

//JTableCreation

model = new DefaultTableModel(new String[] {"Emp Num", "Base Pay", "Hours Worked", "Pay Amt"}, 0);
    outputTable = new JTable(); 
    outputTable.setModel(model);
    JScrollPane scroll = new JScrollPane(outputTable);

更多代码      //将条目添加到JTable

class clickListener implements ActionListener
{
    @SuppressWarnings("unchecked")
    public void actionPerformed(ActionEvent e)
    {
        int empNum = 0;
        double hourlyRate = 0;
        double hoursWorked = 0;

        try
        {
            empNum = Integer.parseInt(empNumField.getText());
        }
        catch(NumberFormatException event)
        {
            JOptionPane.showMessageDialog(null, "Invalid entry.\n\nPlease enter a number for the Employee ID.", "Error", JOptionPane.WARNING_MESSAGE);
            return;
        }
        try
        {
            hourlyRate = Double.parseDouble(basePayField.getText());
        }
        catch(NumberFormatException event)
        {
            JOptionPane.showMessageDialog(null, "Invalid entry.\n\nPlease enter a number for the Hourly Pay Rate.", "Error", JOptionPane.WARNING_MESSAGE);
            return;
        }
        try
        {
            hoursWorked = Double.parseDouble(hrsField.getText());
        }
        catch(NumberFormatException event)
        {
            JOptionPane.showMessageDialog(null, "Invalid entry.\n\nPlease enter a number for the Hours Worked.", "Error", JOptionPane.WARNING_MESSAGE);
            return;
        }

        payAMT = calculatePay(hourlyRate, hoursWorked);

        Object[] newRecord = {empNum,hourlyRate,hoursWorked,payAMT};
        model.addRow(newRecord);

        totalPayAMT += payAMT;
        totalPayLabel.setText("Total Employee Pay: "+totalPayAMT);
    }
}

Answer 1

你需要在0开始你的JTable迭代。行和JTable的列是基于0的。当你从1开始 for 循环时，你并没有像你想象的那样从第一行开始，你实际上是从第2行开始。你也陷入困惑的地方是 JTable.getRowCount（）方法。此方法将返回JTable中当前包含的实际行数，因此您需要调整其值（减去1）以便将其用于迭代，例如：

int cnt = outputTable.getRowCount();
if(oneRadio.isSelected() && cnt > 0) {
    payAMT = payAMT * .01;
    for(int i = 0; i < cnt - 1; i++) {
        outputTable.setValueAt(payAMT, i, 4);
    }
}