当我在Git中推送到远程时,我收到此警告:
warning: push.default is unset; its implicit value is changing in
Git 2.0 from 'matching' to 'simple'. To squelch this message
and maintain the current behavior after the default changes, use:
git config --global push.default matching
To squelch this message and adopt the new behavior now, use:
git config --global push.default simple
See 'git help config' and search for 'push.default' for further information.
(the 'simple' mode was introduced in Git 1.7.11. Use the similar mode
'current' instead of 'simple' if …我需要将HashMap转换为String数组,以下是我的java代码
import java.util.HashMap;
import java.util.Map;
public class demo {
public static void main(String[] args) {
Map<String, String> map1 = new HashMap<String, String>();
map1.put("1", "1");
map1.put("2", "2");
map1.put("3", "3");
String[] str = (String[]) map1.keySet().toArray();
for(int i=0; i<str.length;i++) {
System.out.println(str[i]);
}
}
}
当我运行代码时,我得到以下内容ClassCastException.
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String;
at demo.main(demo.java:17)
我试图将params绑定到INSERT INTO MySQLi预处理语句,如果该变量存在,否则插入null.然后我知道
type variable i corresponding variable has type integer d corresponding variable has type double s corresponding variable has type string b corresponding variable is a blob and will be sent in packets
但是当我插入一个变量= null时,我如何定义变量的类型？或者我应该定义类型''？
我有一个js代码:
/^([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/
但是什么意思[_|\_|\.]？(js regexp)
我在我的mac v10.8.5上安装了MySQL,默认为username=''和password=''.
我如何更改这些username='root'和password='root'？
我有一个这样的 html
<table>
<tr>
<td>
<img src="logo.png" onclick="getNextTableNode(this)">
</td>
</tr>
</table>
<table></table>
我可以用js代码得到第一个tableNode
function getNextTableNode(imgNode)
{
tableNode1 = imgNode.parentNode.parentNode.parentNode;
}
但是我怎样才能得到下一个 tableNode？我不想使用 id 或 name。我试过了：
tableNode2 = tableNode1.nextSibling;
但它没有用。有人可以帮忙吗？提前致谢