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How to make an array of arrays in Java
...ay5 };
(The latter syntax can be used in assignments other than at the point of the variable declaration, whereas the shorter syntax only works with declarations.)
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What is the relative performance difference of if/else versus switch statement in Java?
...mature optimization, which are evil. Rather worry about readabililty and maintainability of the code in question. If there are more than two if/else blocks glued together or its size is unpredictable, then you may highly consider a switch statement.
Alternatively, you can also grab Polymorphism. Fi...
Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?
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There's a striking difference here.
valueOf is returning an Integer object, which may have its values cached between -128 and 127. This is why the first value returns true - it's cached - and the second value returns false - 128 isn't a cached value, so you're getting two separate In...
Retrieving a random item from ArrayList [duplicate]
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anyItem is a method and the System.out.println call is after your return statement so that won't compile anyway since it is unreachable.
Might want to re-write it like:
import java.util.ArrayList;
import java.util.Random;
public class Catalogue
{
private Rand...
What are the disadvantages to declaring Scala case classes?
...ted method". While it requires jumping through some hoops to do so (if you intend to keep the functionality which used to be invisibly generated by the scala compiler), it most certainly can be achieved: stackoverflow.com/a/25538287/501113
– chaotic3quilibrium
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Mod in Java produces negative numbers [duplicate]
When I calculate int i = -1 % 2 I get -1 in Java. In Python, I get 1 as the result of -1 % 2 .
What do I have to do to get the same behavior in Java with the modulo function?
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Read file line by line using ifstream in C++
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Assume that every line consists of two numbers and read token by token:
int a, b;
while (infile >> a >> b)
{
// process pair (a,b)
}
Line-based parsing, using string streams:
#include <sstream>
#include <string>
std::string line;
while (std::getline(infile, line))
{...
Expand/collapse section in UITableView in iOS
...xpanded, or 1+ the number of items in the section if it is expanded.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (mybooleans[section]) {
///we want the number of people plus the header cell
return [self numberOfPeopleInGroup:sec...
How do I create a Linked List Data Structure in Java? [closed]
...st, deletes from the beginning of the list and loops through the list to print the links contained in it. Enhancements to this implementation include making it a double-linked list, adding methods to insert and delete from the middle or end, and by adding get and sort methods as well.
Note: In the...
How to find the 'sizeof' (a pointer pointing to an array)?
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No, you can't. The compiler doesn't know what the pointer is pointing to. There are tricks, like ending the array with a known out-of-band value and then counting the size up until that value, but that's not using sizeof().
Another trick is the one mentioned by Zan, which ...