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Try google. That's a huge topic way past what anyone can answer here.

Here is a basic misunderstanding that will make it hard for anyone to communicate with you about OOP.
toString() is a method...

Dinner time here. Be back in an hour.

See the tutorial: Nested Classes (The Java™ Tutorials > Learning the Java Language > Classes and Objects)


Can you list the different types? I'm not sure I understand what you mean.


Same...

Please post the code's output, add some comments that explain what is wrong with the output and post what you want the output to look like.