Hi, thanks for reading.

The third type of Object is “Object Expression". You usually use it to create an object of an anonymous class that inherits from some type. For example:

window.addMouseListener(object : MouseAdapter() {
    override fun mouseClicked(e: MouseEvent) { /*...*/ }
override fun mouseEntered(e: MouseEvent) { /*...*/ }
})

But it cannot be used to create utils class, so I decide not to put it in.