Class ResizingArrayBag<Item>

  • All Implemented Interfaces:

    public class ResizingArrayBag<Item>
    extends Object
    implements Iterable<Item>
    The ResizingArrayBag class represents a bag (or multiset) of generic items. It supports insertion and iterating over the items in arbitrary order.

    This implementation uses a resizing array. See LinkedBag for a version that uses a singly linked list. The add operation takes constant amortized time; the isEmpty, and size operations take constant time. Iteration takes time proportional to the number of items.

    For additional documentation, see Section 1.3 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.

    Robert Sedgewick, Kevin Wayne
    • Constructor Detail

      • ResizingArrayBag

        public ResizingArrayBag()
        Initializes an empty bag.
    • Method Detail

      • isEmpty

        public boolean isEmpty()
        Is this bag empty?
        true if this bag is empty; false otherwise
      • size

        public int size()
        Returns the number of items in this bag.
        the number of items in this bag
      • add

        public void add​(Item item)
        Adds the item to this bag.
        item - the item to add to this bag
      • iterator

        public Iterator<Item> iterator()
        Returns an iterator that iterates over the items in the bag in arbitrary order.
        Specified by:
        iterator in interface Iterable<Item>
        an iterator that iterates over the items in the bag in arbitrary order
      • main

        public static void main​(String[] args)
        Unit tests the ResizingArrayBag data type.
        args - the command-line arguments