【Java併發編程學習】一、實現多線程兩種方式

public class ThreadImpl01 extends Thread {
    private int ticket = 5;

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            if (ticket > 0) {
                System.out.println("[ThreadImpl01] = " + (ticket--) + " [Thread] = " + Thread.currentThread().getId());
            }
        }
    }
}

public class ThreadImpl02 implements Runnable {
    private int ticket = 5;

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            if (ticket > 0) {
                System.out.println("[ThreadImpl02] = " + ticket-- + " [Thread] = " + Thread.currentThread().getId());
            }
        }
    }
}

public class ThreadImpl03 implements Runnable {
    private int ticket = 5;
    @Override
    public void run() {
        synchronized (ThreadImpl03.class) {
            for (int i = 0; i < 10; i++) {
                if (ticket > 0) {
                    try {
                        Thread.sleep(200);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("[ThreadImpl03] = " + ticket-- + " [Thread] = " + Thread.currentThread().getId());
                }
            }
        }
    }
}

public class ThreadDemo {
    public static void main(String[] args) {
        /**
         * 實現Runnable接口相比繼承Thread類的優點：
         *  一、能夠避免因爲Java的單繼承特性而帶來的侷限；
         *  二、加強程序的健壯性，代碼可以被多個線程共享，代碼與數據是獨立的；
         *  三、適合多個相同程序代碼的線程區處理同一資源的狀況。
         */
        new ThreadImpl01().start();
        new ThreadImpl01().start();
        new ThreadImpl01().start();

        ThreadImpl02 threadImpl02 = new ThreadImpl02();
        new Thread(threadImpl02).start();
        new Thread(threadImpl02).start();
        new Thread(threadImpl02).start();

        ThreadImpl03 threadImpl03 = new ThreadImpl03();
        new Thread(threadImpl03).start();
        new Thread(threadImpl03).start();
        new Thread(threadImpl03).start();
    }
}