华南俳烁实业有限公司

創(chuàng)建一個(gè)線程的第二種方法是創(chuàng)建一個(gè)新的類，該類繼承Thread類，然后創(chuàng)建一個(gè)該類的實(shí)例。

繼承類必須重寫(xiě)run()方法，該方法是新線程的入口點(diǎn)。它也必須調(diào)用start()方法才能執(zhí)行。

實(shí)例

// 通過(guò)繼承 Thread 創(chuàng)建線程
class NewThread extends Thread {
   NewThread() {
      // 創(chuàng)建第二個(gè)新線程
      super("Demo Thread");
      System.out.println("Child thread: " + this);
      start(); // 開(kāi)始線程
   }
 
   // 第二個(gè)線程入口
   public void run() {
      try {
         for(int i = 5; i > 0; i--) {
            System.out.println("Child Thread: " + i);
                            // 讓線程休眠一會(huì)
            Thread.sleep(50);
         }
      } catch (InterruptedException e) {
         System.out.println("Child interrupted.");
      }
      System.out.println("Exiting child thread.");
   }
}
 
public class ExtendThread {
   public static void main(String args[]) {
      new NewThread(); // 創(chuàng)建一個(gè)新線程
      try {
         for(int i = 5; i > 0; i--) {
            System.out.println("Main Thread: " + i);
            Thread.sleep(100);
         }
      } catch (InterruptedException e) {
         System.out.println("Main thread interrupted.");
      }
      System.out.println("Main thread exiting.");
   }
}

編譯以上程序運(yùn)行結(jié)果如下：

Child thread: Thread[Demo Thread,5,main]
Main Thread: 5
Child Thread: 5
Child Thread: 4
Main Thread: 4
Child Thread: 3
Child Thread: 2
Main Thread: 3
Child Thread: 1
Exiting child thread.
Main Thread: 2
Main Thread: 1
Main thread exiting.