What is the equivalent “nth_element” function in Java?

I don't want to get a sorted array, just the value of the nth element For example, given an array

a = [20,5,1,-3]

I want to check

nth_element(a,2) = 1

In C, there is a function STD:: nth_ Element can do this Is there an equivalent Java function?

thank you!

resolvent

Solution

You can use arrays to solve this problem, and it will be fast

int[] a = new int[] { 20,-3 };
int[] b = new int[a.length]; // Make room for a copy
System.arraycopy(a,b,a.length - 1); // A very fast method for copying arrays
Arrays.sort(b); // JDK array sorting,also very fast
int second = b[1]; // Get the 2nd element of the sorted array

Test output run this Code:

1

The algorithm assumes that you do not want to sort the original array If you don't mind, you can certainly skip creating a second array and perform array copy

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