英文:
Does anyone know how to add ActionListener to an array of buttons?
问题
我正在创建一个项目，类似于Mancala（一种棋盘游戏）。我使用循环将ActionListener添加到按钮数组中，并调用各自的处理程序。在第一次运行时，我以为一切都很正常，GUI显示出来了，但当我点击按钮时，虽然GUI能正常工作，但命令行界面却显示了许多错误信息。第二次运行相同的代码时，GUI不再显示，命令行界面显示：
主异常：java.lang.ArrayIndexOutOfBoundsException：8
（还有其他内容。）
以下是我的代码：
Handler handler = new Handler();
for (int i = 0; i <= 8; i++) {
btnPods[i].addActionListener(handler);
}
这样写对吗？
英文:
I'm creating a project and its similar to mancala. I add ActionListener to an array of buttons with a loop and call the separated handler. At first run I thought it was okay, GUI shows up but when I clicked buttons it was working but the CLI says a lot of errors. On the second running, same code the GUI doesn't show up anymore and CLI says:
Exception in main java lang.ArrayIndexOutOfBoundsException:8
(And other stuff.)
Here's my code:
Handler handler = new Handler();
for( int i = 0; i<=8; i++ )
{btnPods[i].addActionListener( handler ); }
Is this right?
答案1
得分: 0
我找到了问题。它超出了边界，因为条件是<= 8，它从0开始，所以应该是<= 7或< 8。我把它改成了i<= 7。但还有其他方法可以向按钮添加addActionlistener吗？还是我所做的方法可以？
我目前是新手，正在寻找热心的人来回应，我真的在寻找很多答案。
英文:
Ooh.. I've found the problem. Its out of bounds because the condition is <= 8 it starts at 0 so it should be <= 7 or < 8. I changed it to i <= 7. But is there any other ways to addActionlistener to a button or what I did is fine?
I'm currently new here and I'm looking for lovely people to respond, I'm really searching for a lot of answers
答案2
得分: 0
自Java 1.5版本（很久以前）开始，您可以使用for-each循环，这将使您不必考虑数组索引：
JButton [] btnPods = ...
Handler handler = new Handler();
for(JButton btnPod : btnPods) {
btnPod.addActionListener(handler);
}
英文:
Since java 1.5 (read since long time ago) you can use for-each loop, this will save you from thinking about the array indices:
JButton [] btnPods = ...
Handler handler = new Handler();
for(JButton btnPod : btnPods) {
btnPod.addActionListener(handler);
}
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