冒泡排序

   public static void main(String[] args) {

         int[] arr = {24, 69, 80, 57, 13};

         for (int i = 0; i < arr.length - 1; i++) {                      

               for (int j = 0; j < arr.length - 1 - i; j++) {       

                    if(arr[j] > arr[j+1]) {

                          int temp = arr[j];

                          arr[j] = arr[j + 1];

                          arr[j+1] = temp;

                    }

               }

         }          

         for (int i = 0; i < arr.length; i++) {

               System.out.print(arr[i] + " ");

         }

    }