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Exam Qs- collection- help!

sarim raza
Ranch Hand

Joined: Nov 02, 2000
Posts: 232
1.Given that file is a reference to a File object that represents a directory, which code fragments will succeed in obtaining a list of the entries in the directory?
A]Vector filelist = ((Directory)file).getList();
B]String [] filelist =;
C]Enumeration filelist = file.contents();
D]String[] filelist = file.list();
E]Vecor filelist= (new Directory(file)).files();
2.Which of these statements concerning the collection interfaces are true?
A]Set extends collection
B]All methods defined in set are also defined in collection
C]List extends collection
D]All methods defined in list are also defined in collection
E]Map extends collection

3.Given two collection objects referenced by col1 and col2, which of these statements are true?
A]The operation col1.retainAll(col2) will not modify col1 object
B]Col1.removeAll(col2) will not modify col2
C]Col1.addAll(col2) will return a new collection object, containing elements from both Col1 and col2
D]Col1.containsAll(col2) will not modify the col1 object
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