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How to execute a java .class from the command line
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You have no valid main method... The signature should be:
public static void main(String[] args);
Hence, in your case the code should look like this:
public class Echo {
public static void main (String[] arg) {
System.out...
Insert a line break in mailto body
...img alt="Subscribe" class="center" height="50" src="subscribe.png" style="width: 137px; height: 50px; color: #4da6f7; font-size: 20px; display: block;" width="137"></a>
You will likely want to take out the %20 before Firstname, otherwise you will have a space as the first character on the...
Git submodule update
...try in the parent repo index), and you will need to add, commit and push said references from the main repo.
Next time you will clone that parent repo, it will populate the submodules to reflect those new SHA1 references.
The rest of this answer details the classic submodule feature (reference to a...
C# 5 async CTP: why is internal “state” set to 0 in generated code before EndAwait call?
...blog, which rocks.
The value 0 here is only special because it's not a valid state which you might be in just before the await in a normal case. In particular, it's not a state which the state machine may end up testing for elsewhere. I believe that using any non-positive value would work just as w...
Call Go functions from C
...nt {
return a + b
}
// This is the public function, callable from outside this package.
// It forwards the parameters to C.doAdd(), which in turn forwards
// them back to goCallbackHandler(). This one performs the addition
// and yields the result.
func MyAdd(a, b int) int {
return int( C.do...
git merge: apply changes to code that moved to a different file
... but my colleague moved that code to a new file in his branch. So when I did git merge my_branch his_branch , git did not notice that the code in the new file was the same as the old, and so none of my changes are there.
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Eclipse Workspaces: What for and why?
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I'll provide you with my vision of somebody who feels very uncomfortable in the Java world, which I assume is also your case.
What it is
A workspace is a concept of grouping together:
a set of (somehow) related projects
some configur...
Select the values of one property on all objects of an array in PowerShell
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To complement the preexisting, helpful answers with guidance of when to use which approach and a performance comparison.
Outside of a pipeline, use (PSv3+): $objects.Name as demonstrated in rageandqq's answer, which is both syntactically simpler and much faster.
Accessing a pr...
What's the need of array with zero elements?
...eof(*var) + extra, GFP_KERNEL);
This used to be not standard and was considered a hack (as Aniket said), but it was standardized in C99. The standard format for it now is:
struct bts_action {
u16 type;
u16 size;
u8 data[];
} __attribute__ ((packed)); /* Note: the __attribute__ is i...
What is the purpose of setting a key in data.table?
...two things:
reorders the rows of the data.table DT by the column(s) provided (a, b) by reference, always in increasing order.
marks those columns as key columns by setting an attribute called sorted to DT.
The reordering is both fast (due to data.table's internal radix sorting) and memory effic...