long start = currentTimeMillis()；

package currentTimeMillis;
import java.util.Random;

import static java.lang.System.currentTimeMillis;
import static java.lang.Thread.sleep;
public class TaskMethodProvider {

	
	
	 private static Random random = new Random();

	    public void taskOne() throws Exception {
	        System.out.println("开始做任务一");
	        long start = currentTimeMillis();
	        sleep(random.nextInt(10000));
	        long end = currentTimeMillis();
	        System.out.println("完成任务一，耗时：" + (end - start) + "毫秒");
	    }

	    public void taskTwo() throws Exception {
	        System.out.println("开始做任务二");
	        long start = currentTimeMillis();
	        sleep(random.nextInt(10000));
	        long end = currentTimeMillis();
	        System.out.println("完成任务二，耗时：" + (end - start) + "毫秒");
	    }

	    public void taskThree() throws Exception {
	        System.out.println("开始做任务三");
	        long start = currentTimeMillis();
	        sleep(random.nextInt(10000));
	        long end = currentTimeMillis();
	        System.out.println("完成任务三，耗时：" + (end - start) + "毫秒");
	    }
}