What special monitor is there in java?

Explanation

1. this monitor: synchronized on a member method is this monitor, which is equivalent to using synchronized(this) in a method

2 , class monitor: synchronized on a static method is a class monitor, which is equivalent to using synchronized(XXX.class)

Instance

public class Main {
    public synchronized void method1(){
        System.out.println(Thread.currentThread().getName()+" method1");
        try{
            TimeUnit.MINUTES.sleep(5);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
    }
 
    public synchronized void method2(){
        System.out.println(Thread.currentThread().getName()+" method2");
        try{
            TimeUnit.MINUTES.sleep(5);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
    }
 
    public static void main(String[] args) throws InterruptedException {
        Main m = new Main();
        new Thread(m::method1).start();
        new Thread(m::method2).start();
    }
}

in a static method

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