Insertion Sort

public class Insertion {
    /**
     * 直接插入排序--交换式
     * @param arr
     * @param <T>
     */
    public static <T extends Comparable<? super T>> void insertionSort(T[] arr) {
        for (int i = 1; i < arr.length; i++) {
            for (int j = i; j > 0; j--) {
                if (arr[j].compareTo(arr[j - 1]) < 0) {
                    swap(arr, j - 1, j);
                }
            }
        }
    }

    //交换数组中的两个元素
    public static void swap(Object[] arr, int i, int j) {
        Object temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
    }

    //打印数组
    public static <T extends Comparable<? super T>> void printArray(T[] arr) {
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();
    }

    public static void main(String[] args) {
        Integer[] arr = {5, 1, 9, 7, 3, 10, 2, 8, 6, 4};
        insertionSort(arr);
        printArray(arr);
    }
}　　

public class Insertion {
    /**
     * 直接插入排序--交换式
     *
     * @param arr
     * @param <T>
     */
    public static <T extends Comparable<? super T>> void insertionSort(T[] arr) {
        for (int i = 1; i < arr.length; i++) {
            for (int j = i; j > 0 && arr[j].compareTo(arr[j - 1]) < 0; j--) {
                swap(arr, j - 1, j);
            }
        }
    }

    //交换数组中的两个元素
    public static void swap(Object[] arr, int i, int j) {
        Object temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
    }

    //打印数组
    public static <T extends Comparable<? super T>> void printArray(T[] arr) {
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();
    }

    public static void main(String[] args) {
        Integer[] arr = {5, 1, 9, 7, 3, 10, 2, 8, 6, 4};
        insertionSort(arr);
        printArray(arr);
    }
}

public class Insertion {
    /**
     * 直接插入排序--赋值版
     *
     * @param arr
     * @param <T>
     */
    public static <T extends Comparable<? super T>> void insertionSort(T[] arr) {
        for (int i = 1; i < arr.length; i++) {
            T temp = arr[i];
            int j = i;
            for (; j > 0 && arr[j - 1].compareTo(temp) > 0; j--) {
                arr[j] = arr[j - 1];
            }
            arr[j] = temp;
        }
    }

    //交换数组中的两个元素
    public static void swap(Object[] arr, int i, int j) {
        Object temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
    }

    //打印数组
    public static <T extends Comparable<? super T>> void printArray(T[] arr) {
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();
    }

    public static void main(String[] args) {
        Integer[] arr = {5, 1, 9, 7, 3, 10, 2, 8, 6, 4};
        insertionSort(arr);
        printArray(arr);
    }
}