java50题----28十个数排序

<pre name="code" class="java">/*对十个数进行排序，由小到大。*/class Demo{private Demo(){}private static Demo instance = new Demo();public static Demo getInstance(){return instance;}public void sort(int[] arr){int len = arr.length;int tmp = 0;for(int i = 0; i < len ; i++) //控制比较的轮数{for(int j = 0; j < len-1-i; j++)//该轮控制比较的次数，轮数增加，比较次数减少。{//此轮结束时最大的数就冒出来了。if(arr[j] > arr[j+1]){tmp = arr[j];arr[j] = arr[j+1];arr[j+1] = tmp;}}}}}class MainClass {public static void main(String[] args) throws Exception{Demo d = Demo.getInstance();int[] arr = {2,3,44,561,3333,79,21,0,1234,56};System.out.println("原始数组:");for(int i = 0; i < 10; i++){System.out.print(arr[i]+"\t");}System.out.println("");d.sort(arr);for(int i = 0; i < 10; i++){System.out.print(arr[i]+"\t");}}}/*如果想实现从大到小的顺序排列，只需要更改：if(a[j] < arr[j+1])*/