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kycon2004
16-12-2005, 06:56
doc nhieu lan ma khong hieu cai nay noi gi ca.
Object itemAt(int n)
//precondition 0<=n and n< size() pót condition: return value í the item that í n from the top (with the top at n=0, the next at n=1 and so on). the stack is not changed.

co anh nao biet cai nay chi dum nhe hoac co code thi cho em tham khao di nhe. gan toi ky thi roi ma ngoi ca ngay cung khogn biet luon.
cam on nhieu