多線程的倆種簡單實現方法（Multithreading）

      多線程實現有倆種方法（僅限於我這個初學多線程的娃）：

                                                                                            ①繼承自Thread類的類對象； 

                                                                                           ②實現於Runnable接口的類對象。

 

      二者的區別是：Thread：   一個Mythread(繼承他的類對象)代表一個線程，故Mythread裏面的資源不可共享；

                                Runnable: Thread修飾MyRunnable，一個Thread代表一個線程，故同一個MyRunnable裏面的資源可共享。

 

public class RunnableandThreadDemo {
	public static void main(String[] args) {
		System.out.println("                   我們先使用繼承Tread類的三個MyThread對象線程運行。\n\n");
		saleticketsTread();

		try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		System.out.println("\n                               現在主線程休眠二秒... ...\n");

		System.out.println("\n現在採用實現Runnable接口的MyRunnable(Thread修飾)的三個接口（共享一個MyRunnable對象，從而實現了資源共享）....\n");
		saleticketsRunnable();
	}

	public static void saleticketsTread() {
		Mythread my1 = new Mythread("1號Tread類型窗口");
		Mythread my2 = new Mythread("2號Tread類型窗口");
		Mythread my3 = new Mythread("3號Tread類型窗口");
		my1.start();
		my2.start();
		my3.start();
	}

	public static void saleticketsRunnable() {
		MyRunnable my = new MyRunnable(); // 實例化MyRunnale（Runnale接口）再用Thread裝飾
		MyRunnable my2 = new MyRunnable();
		Thread thr1 = new Thread(my, "Thread裝飾的Runnale壹號窗口");
		Thread thr2 = new Thread(my, "Thread裝飾的Runnale二號窗口");
		Thread thr3 = new Thread(my, "Thread裝飾的Runnale三號窗口");
		thr1.start();
		thr2.start();
		thr3.start();
	}

}

/**一個Mythread代表一個線程，故Mythread裏面的資源不可共享**/
class Mythread extends Thread { // Mythread繼承Thread類，覆寫Run方法,不共享資源
	private int tickets = 3;
	private String windowname; // 需要自己寫賦予線程名字

	public Mythread(String windowname) {
		super();
		this.windowname = windowname;
	}

	public void run() {
		for (int i = 0; i < 4; i++) {
			if (tickets > 0) {
				System.out.println(windowname + "正在賣第" + tickets-- + "張票");
			}
		}
	}

}

/**Thread修飾MyRunnable，一個Thread代表一個線程，故同一個MyRunnable裏面的資源可共享**/
class MyRunnable implements Runnable {
	private int tickets = 3;

	@Override
	public void run() {
		// TODO Auto-generated method stub
		for (int i = 0; i < 4; i++) {
			if (tickets > 0) {
				System.out.println(Thread.currentThread().getName() + "正在賣第" + tickets-- + "張票");
			}
		}

	}

}

下附線程常用的方法：  Thread.currentThead()  ->當前線程可加上 ".getname()"等方法。    (th爲Thread的對象)  th.isAlive() ——>判斷線程是否死亡。   Thread.sleep(ms)。   th.join()強制運行     th.ionterrupt()強制中斷  th.stePriority(x)  x= (1,10)設置優先值 。。。可能不盡如人意。。。     th.yied() 暫時禮讓，稍後恢復。