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Sos! help me from Polymorphism, Interface & Inner classes...
According to Jaber's instruction, I began "Thinking in Java" one month ago. It's not so easy as most of the people think. After object, program flow, constructor and reusing class, I arrived in Polymorphism, Interface & Inner classes last week. However, I couldn't pass through these 3 parts. I read the book again and again and typed the source codes again and again, it's still in the book instead of in my brain.
I know Polymorphism is the core knowledge of OO so I have to know it well. I wonder whether my study method need a little improvement. I remembered that I was always studying a language through a real project before. Is that be more helpful for me to do a real Java project? If so, can any expert give me a topic?
For example, when someone was willing to learn FoxPro, I will tell him try to write a program about Salary Management. After a simple Salary Management, he should understand database, table, menu, function, procedure, macro and many fundamental phenomenon. After that, he could study more by himself. Can Java be learned like this? If so, can anyone tell me what can I do now except "hello world".
Would you please tell me something more about how to learn Polymorphism, Interface & Inner classes?
Thank you very much in advance. Your help will be great appreciated by all the learners.
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