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Are non-synchronised static methods thread safe if they don't modify static class variables?
...cal to the thread, so no sharing of data occurs, ever.
Immutable objects (String in this case) are also thread-safe because once created they can't be changed and all threads see the same value. On the other hand if the method was accepting (mutable) Date you could have had a problem. Two threads c...
How to provide different Android app icons for different gradle buildTypes?
...Icon}"
android:roundIcon="${appIconRound}"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
...
</application>
</manifest>
build.gradle
android {
...
productFlavors{
Test{
...
Get epoch for a specific date using Javascript
...ernet Explorer. Date constructor relies on the Date.parse() method when a string is passed, which is implementation dependant in ECMA-262 3rd edition and, as a result, notoriously inflexible in IE.
– Andy E
Jul 30 '10 at 7:50
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Python Write bytes to file
I have a function that returns a string. The string contains carriage returns and new line feeds (0x0D, 0x0A). However when I write to a file it contains only the new line feeds. Is there a way to get the output to include the carriage return and the new line feed.
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Using varchar(MAX) vs TEXT on SQL Server
... wrong. LIKE can not use index ONLY if wildcard is at the beginning of the string being searched against.
– SouravA
Jan 5 '15 at 22:42
...
Test if object implements interface
...(object);
}
For example,
java.io.Serializable.class.isInstance("a test string")
evaluates to true.
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MySQL IF NOT NULL, then display 1, else display 0
...eturns 0. Thus, you have to remember to explicitly check for NULL or empty string:
select if(name is null or name = '', 0, 1)
PS Eugen's example up above is correct, but I wanted to clarify this nuance as it caught me by surprise.
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Remove columns from DataTable in C#
....
So for that, here is what I did, when I came across the same problem.
string[] ColumnsToBeDeleted = { "col1", "col2", "col3", "col4" };
foreach (string ColName in ColumnsToBeDeleted)
{
if (dt.Columns.Contains(ColName))
dt.Columns.Remove(ColName);
}
...
Java heap terminology: young, old and permanent generations?
...ce for class definitions and related data. In Java 6 and earlier, interned strings were also stored in the permanent generation. In Java 7, interned strings are stored in the main object heap.
Here is a good post on permanent generation.
I like the descriptions given for each space in Oracle's gui...
Web安全测试之XSS - 更多技术 - 清泛网 - 专注C/C++及内核技术
...了什么样的脚本
当然用户提交的数据还可以通过QueryString(放在URL中)和Cookie发送给服务器. 例如下图
HTML Encode
XSS之所以会发生， 是因为用户输入的数据变成了代码。 所以我们需要对用户输入的数据进行HTML Encode处理。 将...