Java的内部类克分为Inner Class、Anonymous Class和Static Nested Class三种： Inner Class和Anonymous Class本质上是相同的，都必须依附于Outer Class的实例，即隐含地持有Outer.this实例，并拥有Outer Class的private ...

For this exercise you will need your Album and Song classes from the Playlist Coding Exercise. The Album class will be modified to use an inner class called SongList which will replace the ArrayList ...