Comparing Sorting Algorithms

Algorithm	Strategy	Best Use
Insertion Sort	Insert each element into an already sorted portion of the array.	Small or nearly sorted collections.
Selection Sort	Repeatedly select the smallest remaining element.	Learning basic sorting concepts.
Merge Sort	Divide the array into smaller parts, then merge them back together in order.	Large collections where efficient sorting is important.

Which Algorithm Should You Use?

Each algorithm has strengths and weaknesses.

• Insertion sort is a good choice for small collections or data that is already mostly sorted.
• Selection sort is easy to understand and is often introduced when learning how sorting algorithms work.
• Merge sort is much more efficient for large collections because it divides the work into smaller problems before combining the results.

For most Java programs, you do not need to implement these algorithms yourself. The Arrays.sort() method uses highly optimized sorting algorithms behind the scenes.