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Nested Classes(嵌套类与内部类)

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class Outer {
    private val bar: Int =1
    class Nested {
        fun foo() = 2
    }
}
val demo = Outer.Nested().foo() // =2
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class Outer {
    private val bar: Int = 1
    inner class Inner {
        fun foo() = bar
    }
}
val demo = Outer().Inner().foo()// ==1

匿名内部类

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