深入研究Java线程的几种状态及其对程序执行的影响

Thread thread = new Thread(() -> {
    System.out.println("Hello, World!");
});

Thread thread = new Thread(() -> {
    System.out.println("Hello, World!");
});
thread.start();

public class MyRunnable implements Runnable {
    private Object lock = new Object();
    
    public void run() {
        synchronized(lock) {
            System.out.println("In synchronized block");
            // 一些代码
        }
    }
  
    public static void main(String[] args) {
        MyRunnable runnable = new MyRunnable();
        Thread thread1 = new Thread(runnable);
        Thread thread2 = new Thread(runnable);
  
        thread1.start();
        thread2.start();
    }
}

public class MyThread extends Thread {
    public void run() {
        synchronized(this) {
            System.out.println("Waiting for next thread...");
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("Thread resumed.");
        }
    }
  
    public static void main(String[] args) {
        MyThread thread = new MyThread();
        thread.start();
  
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        synchronized(thread) {
            thread.notify();
        }
    }
}

public class MyThread extends Thread {
    public void run() {
        try {
            System.out.println("Thread sleeping...");
            Thread.sleep(2000);
            System.out.println("Thread woke up.");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
  
    public static void main(String[] args) {
        MyThread thread = new MyThread();
        thread.start();
    }
}