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Java Lists Libraries for Efficient Programming

Explore essential Java libraries like java.util for enhanced programming capabilities in building large applications. Learn to leverage ArrayList, LinkedList, and more for effective data handling and processing.

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Java Lists Libraries for Efficient Programming

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  1. Java Lists

  2. Libraries • A library is a collection of frequently used tools to facilitate programming large applications (or other libraries) • Examples you probably have seen • java.Math • java.util.Scanner • java.util.Random • Other examples • Access to servers/databases • Graphics • Reflection

  3. Libraries “Truly knowing a language requires knowing the library” -Paraphrased from Bjarne Stroustrup “Libraries are languages” -Paraphrased from Gabriel dos Reis

  4. Summary of classes (List related) • ArrayList<E> - Resizable-array doubling (supports List) • LinkedList<E> - Doubly linked list (supports List, Deque, Stack, and Queue) • Vector<E> - Resizable-array incremental (supports List) • Stack<E> • ArrayDeque<E> - Resizable-array doubling (supports Deque, Stack, and Queue) • Others outside the scope of this course • To find how to use them, go to the Java API!

  5. Interfaces Classes

  6. Example of using arraylist<E> • Scanner s = newScanner(newFile(“numbers.txt”)); • ArrayList<Integer> numbers = newArrayList<>(); • while(s.hasNextInt()) • numbers.add(s.nextInt()); • …elsewhere… • int sum = 0; • for(int n = 0; n < numbers.size(); ++n) • sum += numbers.get(n);

  7. Problems • Linear regression. Lets help the sciences by creating a simple program for linear regression modeling. Look here for how we compute correlation coefficients.Here is experimental data. • For a given data file, find the correlation coefficient between all pairs of columns. Find the most correlated items. • I recommend trying the solve this problem for x08.txt • Lets discuss together how to break the problem down into manageable pieces.

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