InsertionSort.java

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// Insertion Sort

public class Solution {
  
  public void insertionSort(int[] a) {
    if (a == null || a.length <= 1) { return; }

    for (int i = 1; i < a.length; i++) {
      int j = i;

      while (j > 0 && a[j] < a[j - 1]) {
        swapAt(j - 1, j, a);
        j--;
      }
    }
  }

  private void swapAt(int start, int end, int[] a) {
    int temp = a[start];
    a[start] = a[end];
    a[end] = temp;
  }
}