冒泡排序：相邻的两个数值比较大小，互换位置。

public class Bubbling01 {
	public static void main(String[] args) {
		
		int [] nums = {11,22,90,89,78};
		
		for (int i = 0; i < nums.length -1 ; i++) {
			for (int j = 0; j < nums.length -1 - i; j++) {
				if(nums[j] < nums[j + 1]) {
					int tmp = nums[j];
					nums[j] =nums[j +1];
					nums[j + 1] = tmp;
				}
			}
		}
		System.out.println(Arrays.toString(nums));
	}
}

　　别忘了引入：　　import java.util.Arrays;