问HN：如何学习面向对象设计？
我想深入学习继承、抽象和封装。同样，我也想了解接口和抽象类的必要性。我希望学习如何设计对象。
我正在使用Java。
我找到了一门看起来很不错的课程，但它并不是免费的（就像世界上所有好的东西一样）。
https://course.ccs.neu.edu/cs3500/
它推荐了《Effective Java》、《设计模式：可复用面向对象软件的基础》（GoF）、《Head First 设计模式》等书籍。但这些书大多数更像是风格指南。
我目前处于一个阶段，无法理解如何设计面向对象的程序。我一直疯狂地在Main类下编写所有代码。
我需要一本详细的课程或书籍来学习这些，因为我学习得很慢。而且我这样做是为了乐趣，所以没有时间限制。
有像Grady Booch和Craig Larman的书，但我觉得它们有点枯燥。不过我可能会改变主意。
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I want to learn inheritance, abstraction and encapsulation in depth. Likewise I want to learn about the need of interface and abstract classes. I want to learn to design objects.<p>I am using Java.<p>I found a course which seems OP but it is not freely available(like all the good things in the world).<p>https://course.ccs.neu.edu/cs3500/<p>It recommends Effective Java, GoF, Head First Design Patterns etc. But most of those books are more of a style guide.<p>I am currently at a phase where I do not understand how to design object oriented programs. I have been coding everything under Main class like crazy.<p>I need a detailed course, or book to learn this as I am a very slow learner. And I am doing this for fun, so there is no time constraint.
There are books like grady booch, craig larman, but they are bit too dry in my opinion. But I might change my mind.