JavaAlgorithms/Sorts/InsertionSort.java

/**
 *
 * @author Varun Upadhyay (https://github.com/varunu28)
 *
 */

class InsertionSort {

    /**
     * This method implements the Generic Insertion Sort
     *
     * @param array The array to be sorted 
     * @param last The count of total number of elements in array
     * Sorts the array in increasing order
     **/

    public static <T extends Comparable<T>> void IS(T array[], int last) {
        T key;
        for (int j=1;j<last;j++) {
            
            // Picking up the key(Card)
            key = array[j];
            int i = j-1;
            while (i>=0 && key.compareTo(array[i]) < 0) {
                array[i+1] = array[i];
                i--;
            }
            // Placing the key (Card) at its correct position in the sorted subarray
            array[i+1] = key;
        }
    }

    // Driver Program
    public static void main(String[] args) {
        // Integer Input
        int[] arr1 = {4,23,6,78,1,54,231,9,12};
        int last = arr1.length;
        Integer[] array = new Integer[arr1.length];
        for (int i=0;i<arr1.length;i++) {
            array[i] = arr1[i];
        }

        IS(array, last);

        // Output => 1 4 6 9 12 23 54 78 231
        for (int i=0;i<array.length;i++) {
            System.out.print(array[i] + " ");
        }
        System.out.println();

        // String Input
        String[] array1 = {"c", "a", "e", "b","d"};
        last = array1.length;

        IS(array1, last);

        //Output => a	b	c	d	e
        for(int i=0; i<last; i++)
        {
            System.out.print(array1[i]+"\t");
        }
    }
}