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affordable private java database nolinkQUESTIONS .MainFlow_indented .MainFlow_wide @media print } h3, h4, h5 #ToggleLeft /t Download the JDK Search the Tutorials Trail: Collections Lesson: Implementations Home Page > Collections > Implementations « Previous • TOC Answers to Questions and Exercises: Questions Question: You plan to write a program that uses several basic collection interfaces: Set, List, Queue, and Map. You're not sure which implementations will work best, so you decide to use general-purpose implementations until you get a better idea how your program will work in the real world. Which implementations are these? Answer: Set: HashSet List: ArrayList Queue: LinkedList Map: HashMap Question: If you need a Set implementation that provides value-ordered iteration, which class should you use? Answer: TreeSet guarantees that the sorted set is in ascending element order, sorted according to the natural order of the elements or by the Comparator provided.
affordable private java database Question: Which class do you use to access wrapper implementations? Answer: You use the Collections class, which provides static methods that operate on or return collections. Exercises Exercise: Write a program that reads a text file, specified by the first command line argument, into a List. The program should then print random lines from the file, the number of lines printed to be specified by the second command line argument. Write the program so that a correctly-sized collection is allocated all at once, instead of being gradually expanded as the file is read in. Hint: To determine the number of lines in the file, use java.
affordable private java database io.File.length to obtain the size of the file, then divide by an assumed size of an average line. Answer: Since we're accessing the List randomly, we'll use ArrayList. We estimate the number of lines by taking the file size and dividing by 50.
affordable private java database
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