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Java编程思想-OnJava8-10.4内部类与向上转型
内部类与接口的使用；读源码，语法一定得过关；看似冷门的语法，其实源码中很多有涉及；Java编程思想，学习Java语法的圣经；
Java编程思想导读—语法精讲—理论证明-实操指导50/90
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