How to use java's park method

Description

1. It belongs to the LockSupport class. LockSupport is a thread blocking tool class.

2. All methods are static. You can use park to block the thread, or use unpart to wake up the thread.

Example

public class Demo {
    public static void main(String[] args) {
        System.out.println("main start");
        Thread t1 = new Thread(() -> {
            System.out.println("t1 start");
            LockSupport.park();
            System.out.println("t1 end");
        });
        t1.start();
        LockSupport.unpark(t1);
        System.out.println("main end");
    }
}

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