How Do I Sort Array Of Objects Based On Values Such As Name Without Using The Arrays.sort Method

How do I sort a string array alphabetically without using Arrays.sort?

Java provides compareTo() method to compare the two string lexographically.you can write down your code using compareTo() .Java also provides Collections (classes) for better performance to perform all the computation internally (SortedSet,HashSet, etc) on the Generic as data type.

Why does the Arrays.sort(Object[]) use insertion sort if the array length is less than 7?

The thing to remember about the big-O notation is that it omits (among other things) a constant. The running time is proportional to the value in the O, not equal to it.So the question is, is [math]C_1O(n^2)[/math] greater or less than [math]C_2O(n\, log\,n)[/math]? The answer, of course, depends on [math]C_1[/math] and [math]C_2[/math]. For small values of [math]n[/math], the value of the constants dominates the equation.In a trivial case like this, remember that insertion sort is really O(1/2 n^2). For n=6, that's 18. For n log n, that's 15.5, essentially the same. For n=3, it actually crosses over: 4.7 for the merge sort, 4.5 for the insertion sort.That's before we get into implementation details: nonrecursive sorts like insertion have lower overhead.

How do I sort an array of objects in C++?

Consider you have instances of this type:struct person
{
string last_name;
string first_name;
int id;
};
If you want to sort an array of such instances by lastname, firstname and id, you can do something like this:void sort_person_array(person* pa, size_t len)
{
std::sort(pa, pa + len, [](const auto& p1, const auto& p2)
{
return tie(p1.last_name, p1.first_name, p1.id) <
tie(p2.last_name, p2.first_name, p2.id);
});
}
“tie” returns a std::tuple of references (kind of tuple for this case). The std::tuple implements operator< that invokes operator< of type of the first arguments. If first arguments are equal for both tuples, it operates on second argument and so on. Thanks to tie, implementing custom criteria for sorting is by far easier.

How can I sort numbers in an array in javascript without using sort()?

First off, why are you not using the built-in sort() method? It can take a function as a parameter which lets you sort however you see fit:var measurements = [
[1, 5.6, 9, 78.4],
[4, 3],
[987, 45, 34, 23.3, 45.2, 104.5],
[6, 3.3333, Math.PI]
];

// Sort the arrays in measurements by length
measurements.sort(function (a, b) {
return a.length - b.length;
});
Read the documentation for Array.prototype.sort for more information.If you really need to avoid the built-in sort method, use quicksort as it’s usually the most performant (bubble sort is terrible in this regard). Here’s the implementation I use for my image processing app:function swap(array, i, j) {
var temp = array[i];
array[i] = array[j];
array[j] = temp;
}

function partition(array, left, right) {
var cmp = array[right - 1];
var minEnd = left;
var maxEnd;

for (maxEnd = left; maxEnd < right - 1; maxEnd += 1) {
if (array[maxEnd] <= cmp) {
swap(array, maxEnd, minEnd);
minEnd += 1;
}
}
swap(array, minEnd, right - 1);
return minEnd;
}

function quickSort(array, left, right) {
var p;
if (left < right) {
p = partition(array, left, right);
quickSort(array, left, p);
quickSort(array, p + 1, right);
}
}
The initial values for left and right should be 0 and yourarray.length - 1 respectively. Note that like the built-in sort method, this sorts the array in place.Before you go ahead with this, though, be sure you actually benefit from the performance enough to outweigh the additional complexity and maintenance difficulties.

How do I sort an ArrayList of objects by each object's integer parameter?

I was A2A. As soon as I started writing my answer I saw Soheil Hassas Yeganeh answer which is exact replica of what I would have also written. Just to add few more points to the below answer,prefer using comparator instead of comparable.By Using a Comparable you are finalizing the default sorting behaviour for your class which may or may not be useful for others.When to use Comparable:Class should implement the comparable interface when it is the most natural way of sorting objects of that class,and anyone who wants to sort those objects would also do what is done in comparable implementation.Or to be specific use comparable when you want to define default sorting order for objects of a class.When to use Comparator(Prefered Method):When you can't decide upon the natural sorting for your class, then go for this option.As in your case one may want to sort Employee objects either by salary,age,Id etc, so for each of these sorting behaviour use comparator for each sorting criteria.PS:I think you should always refer http://stackoverflow.com/ for all such technical questions.Stack Overflow is a question and answer site for professional and enthusiast programmers containing library of detailed answers to every question about programming.