JavaAlgorithms/Sorts/InsertionSortInteger.java

/**
 * This is my implementation of an insertion sort.
 * 
 * I decided to do this when i didn't feel comfortable enough about implementing 
 * different types of sorts, so this is my trial and error to try and get myself to implement
 * the various sorts correctly. 
 * 
 * @author Kody C. Kendall
 *
 */
public class InsertionSortInteger {

	
	/**
	 * This method implements insertion sort by integer
	 * 
	 * @param initialArray array to be sorted
	 * @return sorted array
	 */
	public int[] insertionIntArraySort(int[] initialArray){
		
		int[] sortedArray = new int[initialArray.length];
		
		//Marking first element as sorted. 
		sortedArray[0] = initialArray[0];
				
		//For each element in the initialArray
		for (int index = 1; index < initialArray.length; index++){	
			
			//Finding the last index that was sorted
			int lastSortedIndex = index;
			
			//Extracting the next element to be compared w/ other sorted elements from initial array
			int extractedElement = initialArray[index];
			
			//Compare the values of the sorted index to the current extractedElement
			for (lastSortedIndex = index; lastSortedIndex > 0; lastSortedIndex--){
				
				//If our extracted element is smaller than element to the right, switch them. 
				if (sortedArray[lastSortedIndex-1] > extractedElement){
					//move the element to the left of extractedElement to the right in sortedArray
					sortedArray[lastSortedIndex] = sortedArray[lastSortedIndex-1];
					//And move the current extractedElement to the left one (since it's smaller). 
					sortedArray[lastSortedIndex-1] = extractedElement;
				}
				else{
					//insert element where it is.
					sortedArray[lastSortedIndex] = extractedElement;
					//Terminating loop since element is in the right spot. 
					break;  
				}
				
			}
			
		}
		
		return sortedArray;
		
	}

}