java - 当将值设置为特定列时，JTable Java 错误堆栈溢出

Question

下面是我的代码。我创建了一个包含 4 列和 3 行的 Jtable。并添加表模型监听器，在表更改监听器中，当我在特定列中设置值时，堆栈溢出错误即将到来。

**error is Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
    at java.nio.Buffer.<init>(Buffer.java:189)
    at java.nio.CharBuffer.<init>(CharBuffer.java:276)
    at java.nio.HeapCharBuffer.<init>(HeapCharBuffer.java:70)
    at java.nio.CharBuffer.wrap(CharBuffer.java:369)
    at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:265)**

代码是:

打包测试；

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;

public class TableModelListenerDemo {

    public static void main(String args[]) {

        final Object rowData[][] = {{"1", "one", "I",null}, {"2", "two", "II",null}, {"3", "three", "III",null}};
        final String columnNames[] = {"#", "English", "Roman", "Test"};

        final JTable table = new JTable(rowData, columnNames);
        JScrollPane scrollPane = new JScrollPane(table);
        table.getModel().addTableModelListener(new TableModelListener() {

            @Override
            public void tableChanged(TableModelEvent e) {
                try {
                    System.out.println(e);
                    int row = table.getSelectedRow();
                    Object QTY = table.getValueAt(row, 0);
                    Object UPrice = table.getValueAt(row, 1);
                    Object Three = table.getValueAt(row, 2);
                    table.setValueAt(Three, row, 3);
                }catch(Exception ex){

                }

            }
        });

        table.setValueAt("", 0, 0);
        JFrame frame = new JFrame("Resizing Table");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(scrollPane, BorderLayout.CENTER);

        frame.setSize(300, 150);
        frame.setVisible(true);

    }
}

Answer 1

JTable#setValueAt 将调用 TableModel#setValueAt，这将触发 TableChanged 事件，这就是它导致您 的原因StackOverflowException(陷入死循环)

更好的解决方案是覆盖 TableModel#setValueAt 并且如果列 0、1 或 2 已更新，还计算列 3 的值，但不要忘记触发 cellUpdated 事件