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Callback functions in Java
...a's anonymous class can be used as well.
public class Main {
public interface Visitor{
int doJob(int a, int b);
}
public static void main(String[] args) {
Visitor adder = new Visitor(){
public int doJob(int a, int b) {
return a + b;
...
TreeMap sort by value
...ew Comparator<Map.Entry<K,V>>() {
@Override public int compare(Map.Entry<K,V> e1, Map.Entry<K,V> e2) {
int res = e1.getValue().compareTo(e2.getValue());
return res != 0 ? res : 1;
}
}
);
sortedEntries.add...
Is it a bad practice to use break in a for loop? [closed]
...t be executed after the break. If, however, the loop is short and to the point, the purpose of the break statement should be obvious.
If a loop is getting too big, use one or more well-named function calls within the loop instead. The only real reason to avoid doing so is for processing bottlenecks...
How to create a generic array in Java?
...GenSet<E> {
private E[] a;
public GenSet(Class<E> c, int s) {
// Use Array native method to create array
// of a type only known at run time
@SuppressWarnings("unchecked")
final E[] a = (E[]) Array.newInstance(c, s);
this.a = a;
}
...
How to get element by innerText
...electorAll(haystack), 0);
}
// if haystack has a length property, we convert it to an Array
// (if it's already an array, this is pointless, but not harmful):
else if (haystack.length) {
elems = [].slice.call(haystack, 0);
}
// work out whether we're looking at innerText (IE...
Difference Between Invoke and DynamicInvoke
... is very fast - everything is already pre-validated. For example:
Func<int,int> twice = x => x * 2;
int i = 3;
int j = twice.Invoke(i);
// or just:
int j = twice(i);
However! If you just know that it is Delegate, it has to resolve the parameters etc manually - this might involve unboxing...
Resolve build errors due to circular dependency amongst classes
...e: B.h
class B {
A _a;
};
// file main.cc
#include "A.h"
#include "B.h"
int main(...) {
A a;
}
When you are compiling the .cc file (remember that the .cc and not the .h is the unit of compilation), you need to allocate space for object A. So, well, how much space then? Enough to store B! What...
SQL query return data from multiple tables
... Joins (this stackOverflow answer is excellent to describe types of joins)
Intersect queries (and how to reproduce them if your database doesn't support them) - this is a function of SQL-Server (see info) and part of the reason I wrote this whole thing in the first place.
Part 2
Subqueries - what...
Log to the base 2 in python
...n_or_method'>
String Form: <built-in function log>
Namespace: Interactive
Docstring:
log(x[, base]) -> the logarithm of x to the given base.
If the base not specified, returns the natural logarithm (base e) of x.
In [25]: math.log(8,2)
Out[25]: 3.0
...
Check if a string contains a string in C++
... std::cout << "found!" << '\n';
}
Note: "found!" will be printed if s2 is a substring of s1, both s1 and s2 are of type std::string.
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