How can i understand swing components?

hi
i am tonmoy. i have some question about swing component
i,e JTextField,JListBox JTable etc.
1. i have made a class name StyledDOcument extends
DefaultStyledDocument so i can access any public method of
DefaultStyledDocument. but my problem is that i cannot understand
which method is implicitly called and whcih are not.
for example InsertString(int offs, String str, AttributeSet a)
is internally called because if i dont override it or call it using
super.insertstring(), it will be called internally everytime i press
char from keybord.
so i think there are many method of swing components that are called
internally but by reading java doc i can't understand
which method is internally called and which are not.
so plese answer my questions in details.
thank you

Tutorials, Teachers, and books are all good ways to learn these things.

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uhm. crosspost
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How can one optimize Swing-Answer this one

How come i wrote a simple code extending JPanel as shown belo trying to render a new component but realized the running code was consuming like 88% of the processor time, using windows task manager. Is there a way to help swing eat less memory and processor time?
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How can i understand swing components?

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