1、Thread.join() 方法
调用Object.wait()方法，他的目的是暂停主线程，等待执行完子线程后主线程才继续执行。
2、Executors.newSingleThreadExecutor() 一个线程的线程池
加入到调度队列中 由于队列是FIFO所以可以按加入顺序执行。
```
public class Interview01 {
static Thread thread1 =new Thread(() -> System.out.println("thread1"));
static Thread thread2 =new Thread(() -> System.out.println("thread2"));
static Thread thread3 =new Thread(() -> System.out.println("thread3"));
public static void main(String[] args) {
//1 Thread.join()
// method1();
//2 Executors.newSingleThreadExecutor()
method2();
}
public static void method1(){
thread1.start();
try {
thread1.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
thread2.start();
try {
thread2.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
thread3.start();
}
public static void method2(){
ExecutorService executorService = Executors.newSingleThreadExecutor();
executorService.submit(thread1);
executorService.submit(thread2);
executorService.submit(thread3);
executorService.shutdown();
}
}
```
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