Collections vs Arrays regarding sort()

Question

Collections vs Arrays regarding sort() What is the difference between these two regarding sort() method? I know Arrays\' sort() is using binary search for sort(), what about Co

Answer 1

Collections.sort() Operates on List Whereas Arrays.sort() Operates on an Array.

Arrays.sort() uses Dual-Pivot Quicksort for Primitive Arrays and MergeSort for sorting array of Objects.

Example of Collections.sort() :

 ArrayList arr = new ArrayList();
 arr.add(15);
 arr.add(10);
 arr.add(5); 
 arr.add(2); 

 Collections.sort(arr);

Example of Arrays.sort() :

int[] arr = new int[4]
 arr[0]=15;
 arr[1]=10;
 arr[2]=5; 
 arr[3]=2; 

 Arrays.sort(arr);