java选择排序法

选择排序法，每一趟从待排序的元素中选出最小（或最大）的一个元素，顺序放在已排序好的数列最后，直到全部数据元素排完。

package com.demo;

public class Demo {
	public static int[] orderBySelect(int[] nums, String str){
		/**
		 * Ordered by descend
		 */
		if(str.equalsIgnoreCase("desc")){
			for(int i = 0; i < nums.length; i++ )
				for (int j = i + 1; j < nums.length; j++) {
					if(nums[i] < nums[j]){
						int temp = nums[i];
						nums[i] = nums[j];
						nums[j] = temp;
					}
				}
			
		}
		/**
		 * Ordered by ascend
		 */
			else if(str.equalsIgnoreCase("esc")){
				for (int i = 0; i < nums.length; i++) {
					for (int j = i + 1; j < nums.length; j++) {
						if(nums[i] > nums[j]){
							int temp = nums[j];
							nums[j] = nums[i];
							nums[i] = temp;
						}
					}
				}
			}
			return nums;

	}
	public static void main(String[] args) throws Exception {
		System.out.println("从大到小：");
		int nums1[] = orderBySelect(new int[]{1, 3, 5, 2, 56, 23}, "desc");
		for (int i = 0; i < nums1.length; i++) {
			System.out.print(nums1[i] + " ");
		}
		System.out.println();
		System.out.println("从小到大：");
		int nums2[] = orderBySelect(new int[]{1, 3, 5, 2, 56, 23}, "esc");
		for (int i = 0; i < nums2.length; i++) {
			System.out.print(nums2[i] + " ");
		}
	}
}

从大到小：
56 23 5 3 2 1 
从小到大：
1 2 3 5 23 56