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选择排序（Selection sort）是一种简单直观的排序算法。它的工作原理是：
第一次从待排序的数据元素中选出最小（或最大）的一个元素，存放在序列的起始位置，然后再从剩余的未排序元素中寻找到最小（大）元素，然后放到已排序的序列的开头。
以此类推，直到全部待排序的数据元素的个数为零。
选择排序是不稳定的排序方法。
选择排序的不稳定例子很简单。
比如A 80 B 80 C 70 这三个数据从小到大排序
第一步会把C和A做交换 变成C B A
第二步和第三步不需要再做交换了。所以排序完是C B A
但是稳定的排序应该是C A B 有横跨的交换 可能会导致原本的顺序换掉了，所以不稳定
排序过程：
代码：
package sort; import java.util.Scanner; public class SelectionSort { public
static void main(String[] args) { System.out.println("请输入排序的个数"); Scanner in =
new Scanner(System.in); int sc = in.nextInt(); int temp;
System.out.println("请输入要排列的数"); int[] arr = new int[sc]; for (int i = 0; i <
arr.length; i++) { arr[i]=in.nextInt(); } for (int i = 0; i < arr.length-1;
i++) { for (int j = i+1; j < arr.length; j++) { if(arr[i]>arr[j]){ temp=arr[i];
arr[i]=arr[j]; arr[j]=temp; } } } System.out.println("这个是排序后的结果:"); for (int i
= 0; i < arr.length; i++) { System.out.print(arr[i]+" "); } } }
