当setvalue到特定列时,JTable Java Error Stack OverFlow [英] JTable Java Error Stack OverFlow when setvalue to a specific column
问题描述
这是我的代码如下。我创建了一个包含4列和3行的Jtable。
并添加表模型监听器,在表中更改监听器,当我在特定列中设置值时,Stack Overflow错误即将到来。
This is my Code below. I have created a Jtable with 4 column and 3 rows. and add table model listener, In the Table change Listener, When i set the value in a particular column Stack Overflow error is coming.
**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:
包裹测试;
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);
}
}
推荐答案
JTable #setValueAt
将调用 TableModel #setValueAt
,这将触发 TableChanged
event,这就是为什么它会导致你 StackOverflowException
(它被无限循环捕获)
JTable#setValueAt
will call TableModel#setValueAt
, which will trigger a TableChanged
event, which is why it's causing you a StackOverflowException
(it's caught in an infinite loop)
更好的解决方案是覆盖 TableModel #setValueAt
,如果列 0
, 1
或 2
更新,也计算列 3
的值,但不要不要忘记发起 cellUpdated
事件
The better solution would be to override the TableModel#setValueAt
and if the column 0
, 1
or 2
is updated, also calculate the value for column 3
, but don't forget to fire a cellUpdated
event
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