Java/Android等待线程完成后再运行新方法

public class Main {
    public static void main(String[] args) {
        Thread thread1 = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("Thread 1 is running");
            }
        });

        Thread thread2 = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("Thread 2 is running");
            }
        });

        thread1.start();
        try {
            thread1.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        thread2.start();
        try {
            thread2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("All threads completed");
    }
}

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new MyAsyncTask().execute();
    }

    private class MyAsyncTask extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... voids) {
            // 在这里执行耗时操作
            Log.d(TAG, "Thread 1 is running");
            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            // 在这里执行新方法
            Log.d(TAG, "Thread 2 is running");
        }
    }
}