java排序算法-选择排序

public class SelectionSort {

	private static void selectSortTest() {
		int[] sortArray = { 5, 2, 4, 1, 3 };
		System.out.print("选择排序前: ");
		Utils.printArray(sortArray);
		selectSort(sortArray);
		System.out.print("选择排序后: ");
		Utils.printArray(sortArray);
	}

	public static void selectSort(int[] sort) {
		int temp;
		for (int i = 0; i < sort.length - 1; i++) {
			for (int j = i + 1; j < sort.length; j++) {
				if (sort[i] > sort[j]) {
					temp = sort[i];
					sort[i] = sort[j];
					sort[j] = temp;
				}
			}
		}
	}

	public static void heapSortTest(){
		int[] arr = { 5, 2, 4, 1, 3 };
		Utils.printArray("堆排序前：",arr);
		heapSort(arr);
		Utils.printArray("堆排序后：",arr);
	}

	public static void heapSort(int[] arr) {
		int arrLen = arr.length;
		int temp = 0;

		//建立堆
		for (int i = (arrLen-1) / 2; i >= 0; i--)
			adjustHeap(arr, i, arrLen);

		//调整堆
		for (int i = arrLen - 2; i >= 0; i--) {
			temp = arr[i + 1];
			arr[i + 1] = arr[0];
			arr[0] = temp;
			adjustHeap(arr, 0, i + 1);

//			Utils.printArray("第"+(9-i)+"次调整：",arr);
		}
	}

	public static void adjustHeap(int[] arr, int ri, int n) {
		int temp = arr[ri];
		int ci = 2 * ri + 1;
		while (ci <= n - 1) {
			if (ci < n - 1 && arr[ci] < arr[ci + 1])
				ci++;

			if (temp >= arr[ci])
				break;
			arr[(ci - 1) / 2] = arr[ci];
			ci = 2 * ci + 1;
		}
		arr[(ci - 1) / 2] = temp;
	}

	public static void main(String [] args){
		selectSortTest();
		heapSortTest();
	}
}