多线程的创建方式：

1. 继续Thread的类，重新run方法 ```java public class ExtendsThread extends Thread {

   @Override public void run() {

    System.out.println(Thread.currentThread().getName() + ",我是子线程");

   }

   public static void main(String[] args) {

    System.out.println(Thread.currentThread().getName() + "，我是主线程");
    new ExtendsThread().run();
    ExtendsThread thread = new ExtendsThread();
    thread.start();
    thread.interrupt();

   }

}

2. 实现Runnable接口，重写run方法
```java
public class ImplementRunnable implements Runnable {
@Override
public void run() {
    // TODO Auto-generated method stub
    System.out.println(Thread.currentThread().getName() + "，我是子线程");
}
public static void main(String[] args) {
    System.out.println(Thread.currentThread().getName() + ",我是主线程");
    new Thread(() -> System.out.println(Thread.currentThread().getName() + "----")).start();
    //
    Thread thread = new Thread(new ImplementRunnable());
    thread.setName("zs");
    thread.start();
    new Thread(new Runnable() {
        @Override
        public void run() {
            // TODO Auto-generated method stub
            System.out.println(Thread.currentThread().getName() + "，我是子线程");
        }
    }).start();
}

1. 可以带返回结果的的线程 Callable Future

   public class MyCallable implements Callable<String> {
    @Override
    public String call() throws Exception {
        // TODO Auto-generated method stub
        return "异步执行发送短信";
    }
    public static void main(String[] args) {
        MyCallable myCallable = new MyCallable();
        try {
            String call = myCallable.call();
            System.out.println(call);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        FutureTask<String> futureTask = new FutureTask<String>(new MyCallable());
        new Thread(futureTask).start();
        try {
            System.out.println("result: " + futureTask.get());
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ExecutionException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
   }

2. 线程池批量创建线程

   public class exectorCreateThread {
    public static void main(String[] args) {
        ThreadPoolExecutor executor = new ThreadPoolExecutor(0, Integer.MAX_VALUE, 60L, TimeUnit.SECONDS,
                new SynchronousQueue<Runnable>());
        executor.execute(new Thread(() -> {
            System.out.println(Thread.currentThread().getName() + ",我是线程池创建");
        }));
    }
   }

3. 其他扩展方式创建线程： spring提供异步直接@Asyn

多个线程交替打印数字，顺序打印

public class Test {
    public static void main(String[] args) {
        Data data = new Data();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                data.printA();
            }
        }, "A").start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                data.printB();
            }
        }, "B").start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                data.printC();
            }
        }, "C").start();
    }
}
class Data{
    Lock lock = new ReentrantLock();
    // Condition 可以保障精准通知
    Condition condition1 = lock.newCondition();
    Condition condition2 = lock.newCondition();
    Condition condition3 = lock.newCondition();
    private int num = 1;
    private int size = 0;
    public void printA() {
        lock.lock();
        try {
            while (num != 1) {
                condition1.await();
            }
            System.out.println(Thread.currentThread().getName() + ":" + size ++);
            num = 2;
            condition2.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void printB() {
        lock.lock();
        try {
            while (num != 2) {
                condition2.await();
            }
            System.out.println(Thread.currentThread().getName() + ":" + size ++);
            num = 3;
            condition3.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void printC() {
        lock.lock();
        try {
            while (num != 3) {
                condition3.await();
            }
            System.out.println(Thread.currentThread().getName() + ":" + size ++);
            num = 1;
            condition1.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}