随便选择两个城市作为预选旅游目标，实现两个独立线程分别显示10次城市 名，每显示后休眠一段随机时间(1000ms以内)，哪个先显示完毕，就决定去哪个 城市。分别用Runnable接口和Thread类实现。

以下是用Runnable接口实现的代码： ```java import java.util.Random; public class TravelRunnable implements Runnable { private String city; private Random random = new Random(); public TravelRunnable(String city) { this.city = city; } @Override public void run() { for (int i = 1; i <= 10; i++) { System.out.println(city); try { Thread.sleep(random.nextInt(1000)); } catch (InterruptedException e) { e.printStackTrace(); } } } public static void main(String[] args) { TravelRunnable travel1 = new TravelRunnable("Beijing"); TravelRunnable travel2 = new TravelRunnable("Shanghai"); Thread thread1 = new Thread(travel1); Thread thread2 = new Thread(travel2); thread1.start(); thread2.start(); try { thread1.join(); thread2.join(); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("We decided to travel to " + (travel1.random.nextInt(2) == 0 ? "Beijing" : "Shanghai")); } } ``` 以下是用Thread类实现的代码： ```java import java.util.Random; public class TravelThread extends Thread { private String city; private Random random = new Random(); public TravelThread(String city) { this.city = city; } @Override public void run() { for (int i = 1; i <= 10; i++) { System.out.println(city); try { Thread.sleep(random.nextInt(1000)); } catch (InterruptedException e) { e.printStackTrace(); } } } public static void main(String[] args) { TravelThread travel1 = new TravelThread("Beijing"); TravelThread travel2 = new TravelThread("Shanghai"); travel1.start(); travel2.start(); try { travel1.join(); travel2.join(); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("We decided to travel to " + (travel1.random.nextInt(2) == 0 ? "Beijing" : "Shanghai")); } } ```