java中Arrays.sort排序更快

import java.util.Arrays;

public class p21 {

	public static void main(String[] args) {
		int[] nums = new int[30];
		for (int i = 0; i < nums.length; i++) {
			nums[i] = (int)(Math.random()*667);
			
			}
		//计算排序时间
		long stratTime = System.currentTimeMillis();
		//java包里自带的函数
		Arrays.sort(nums);
		long endTime = System.currentTimeMillis();
		
		System.out.printf("耗时 %d 毫秒\n",endTime-stratTime);
		
		for (int i = 0; i < nums.length; i++) {
			System.out.printf("%d  ",nums[i]);
		}

	}

}