1.外部类使用外部类中的内部类
public class Outer { int some_member; abstract class InnerBase { abstract void method(); } } class OuterExtendsInner extends Outer.InnerBase { Outer ou = null ; public OuterExtendsInner(Outer o) { o.super(); this.ou = o ; } void method() { int x = ou.some_member ; // do some thing with some_member ; } }?