冒泡排序

/**
 * 冒泡排序
 * @author fgtian
 *
 */
public class BubleSort {
	public static void sort(int[] arr) {
		int length = arr.length;
		for (int i = 0; i < length; i++) {
			for (int j = length - 1; j > i; j--) {
				int num1 = arr[j];
				int num2 = arr[j - 1];
				if (num2 > num1) {
					arr[j - 1] = num1;
					arr[j] = num2;
				}
			}
		}
	}
	
	public static void main(String[] args) {
		int len = 10;
		int[] arr = new int[len];
		Random r = new Random();
		for (int i = 0; i < len; i++) {
			arr[i] = r.nextInt(100) - 50;
		}
		sort(arr);
		for (int i = 0; i < len; i++) {
			System.out.print("    " + arr[i]);
		}
	}
}