When using the keyword synchronized, on which object is the locking mechanism performed?

In Java, when using the synchronized keyword, the locking mechanism depends on the context:

• If synchronized is applied to a non-static method, the lock occurs on the object (this) on which the method is called.
• If synchronized is applied to a static method, the lock occurs on the class object (Class), that is, on the class itself.
• If a synchronized(obj) block is used, the lock occurs on the obj object.

Example:

public class Example {
    public synchronized void instanceMethod() {
        // lock on this
    }

    public static synchronized void staticMethod() {
        // lock on Example.class
    }

    public void blockMethod() {
        Object lock = new Object();
        synchronized(lock) {
            // lock on lock
        }
    }
}