达内(实现测试java运行时间代码)

package demo01;

import java.util.Arrays;
import java.util.Random;

public class Demo01 {

/**
 * @param args
 */
public static void main(String[] args) {
//int[] aryone = new int[]{1,2,3,4,5,6,7,8};
//int[] arytwo = Arrays.copyOf(aryone,  aryone.length);
//
//System.out.println(Arrays.toString(aryone));
//System.out.println(Arrays.toString(arytwo));

int[] aryone = new int[500000];
Random random = new Random(5);//这里为了每次都一样的序列
for(int i = 0; i < aryone.length; i++)
{
aryone[i] = random.nextInt(10000);//int 范围
}

//int[] arytwo = Arrays.copyOf(aryone, aryone.length);
long t1 = System.currentTimeMillis();
Arrays.sort(aryone);
long t2 = System.currentTimeMillis();

System.out.println("系统自带优化的排序的用时:" + (t2-t1));

}

}