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Virtual Memory Usage from Java under Linux, too much memory used
I have a problem with a Java application running under Linux.
8 Answers
8
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Implications of foldr vs. foldl (or foldl')
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The recursion for foldr f x ys where ys = [y1,y2,...,yk] looks like
f y1 (f y2 (... (f yk x) ...))
whereas the recursion for foldl f x ys looks like
f (... (f (f x y1) y2) ...) yk
An important difference here is that if the result of f x y can b...
How does Java handle integer underflows and overflows and how would you check for it?
...um value and continues from there. If it underflows, it goes back to the maximum value and continues from there.
You can check that beforehand as follows:
public static boolean willAdditionOverflow(int left, int right) {
if (right < 0 && right != Integer.MIN_VALUE) {
return ...
Mockito. Verify method arguments
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An alternative to ArgumentMatcher is ArgumentCaptor.
Official example:
ArgumentCaptor<Person> argument = ArgumentCaptor.forClass(Person.class);
verify(mock).doSomething(argument.capture());
assertEquals("John", argument.getValue().getName());
A captor can also be defined using t...
Find first element by predicate
...ek(num -> System.out.println("will filter " + num))
.filter(x -> x > 5)
.findFirst()
.get();
System.out.println(a);
Which outputs:
will filter 1
will filter 10
10
You see that only the two first elements of the stream are actually processed.
So you ...
What are good grep tools for Windows? [closed]
...features are:
Right-click on a folder to run PowerGREP on it
Use regular expressions or literal text
Specify wildcards for files to include & exclude
Search & replace
Preview mode is nice because you can make sure you're replacing what you intend to.
Now I realize that the other grep tools...
Unit testing that events are raised in C# (in order)
...events that gets raised, and the order they get raised in, you can easily extend your existing test:
[TestMethod]
public void Test_ThatMyEventIsRaised()
{
List<string> receivedEvents = new List<string>();
MyClass myClass = new MyClass();
myClass.PropertyChanged += delegate(...
Rerender view on browser resize with React
...idth, height] = useWindowSize();
return <span>Window size: {width} x {height}</span>;
}
The advantage here is the logic is encapsulated, and you can use this Hook anywhere you want to use the window size.
Using React classes:
You can listen in componentDidMount, something like this...
Count number of rows within each group
... I have done it, but it seems that I get 2 times each column except the one that is aggregated; so I have done a merge on them and it seems to be ok
– sop
May 18 '15 at 7:20
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How to make good reproducible pandas examples
...ike this , newcomers are able to get some help on putting together these examples. People who are able to read these guides and come back with reproducible data will often have much better luck getting answers to their questions.
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