首先创建一个长度是5的数组,并填充随机数。首先用选择法正排序，然后再对其使用冒泡法倒排序

public class Test17 {
	public static void main(String[] args) {
		int []arr = new int[5];
		for (int x = 1; x < 100; x++) {

			Random r = new Random();
			arr[0] = r.nextInt(x);
			arr[1] = r.nextInt(x);
			arr[2] = r.nextInt(x);
			arr[3] = r.nextInt(x);
			arr[4] = r.nextInt(x);

		}
		printArray(arr);
		maopaoSort(arr);
		System.out.println("\n");
		printArray(arr);
		selectSort(arr);
		System.out.println("\n");
		printArray(arr);

	}
	private static void selectSort(int[] arr) {
		for (int i = 0; i < arr.length-1; i++) {
			for (int j = i+1; j < arr.length; j++) {
				if(arr[i]>arr[j])
					swap(arr,i,j);
			}
		}

	}
	private static void maopaoSort(int[] arr) {
		for (int i = 0; i < arr.length; i++) {
			for (int j = 0; j < arr.length-1; j++) {
				if(arr[j]>arr[j+1])
					swap(arr,j,j+1);
			}
		}

	}
	private static void swap(int[] arr, int i, int j) {
		int temp = arr[i];
		arr[i]=arr[j];
		arr[j]=temp;

	}
	public static void printArray(int []arr){
		for (int i = 0; i < arr.length; i++) {
			System.out.print(arr[i]+" ");
		}
	}

}