Java 如何检查是否选择了一行？
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How can i check to see if a row has been selected?
提问by
I have a button click event on which i am getting a column value, if a Tablerow is selected. But if i don't select the row and click the button i get the error: java.lang.ArrayIndexOutOfBoundsException:-1my question is how can i check to see if a row has been selected pseudocode: if(Row == selected) { execute }
如果Table选择了一行，我有一个按钮单击事件，我将在该事件上获取列值。但是，如果我不选择行并单击按钮，java.lang.ArrayIndexOutOfBoundsException:-1则会出现错误：我的问题是如何检查是否选择了一行伪代码：if(Row == selected) { execute }
java code i have:
我有Java代码：
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try
{
int row = Table.getSelectedRow();
String Table_click = (Table.getModel().getValueAt(row, 0).toString());
//... implementation hire
} catch (Exception e)
{
JOptionPane.showMessageDialog(null, e);
}
}
Thank you for your help.
感谢您的帮助。
采纳答案by MarsAtomic
Stop and think logically about your problem before you're tempted to post. Take a break from coding if you need to -- once you take a break, the solution to the problem often presents itself in short order.
在你想发帖之前停下来并合乎逻辑地思考你的问题。如果需要，请从编码中休息一下——一旦休息一下，问题的解决方案通常会在短时间内出现。
int row = Table.getSelectedRow();
if(row == -1)
{
// No row selected
// Show error message
}
else
{
String Table_click = (Table.getModel().getValueAt(row, 0).toString());
// do whatever you need to do with the data from the row
}
回答by Davie Brown
if row > -1 then you know a row has been selected. see: http://docs.oracle.com/javase/7/docs/api/javax/swing/JTable.html#getSelectedRow()
如果 row > -1 则您知道已选择一行。见：http: //docs.oracle.com/javase/7/docs/api/javax/swing/JTable.html#getSelectedRow()
回答by gilly3
When no row is selected, getSelectedRow()returns -1.
当没有选择行时，getSelectedRow()返回-1。
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
int row = Table.getSelectedRow();
if (row > -1) {
String Table_click = (Table.getModel().getValueAt(row, 0).toString());
//... implementation here
}
}
catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
