ResizingArrayBag (Algorithms 4/e)

Object
- edu.princeton.cs.algs4.ResizingArrayBag<Item>

All Implemented Interfaces:

Iterable<Item>
```
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.

Author:

Robert Sedgewick, Kevin Wayne

Constructor Summary

Constructors
Constructor Description

ResizingArrayBag()
Initializes an empty bag.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(Item item)`	Adds the item to this bag.
`boolean`	`isEmpty()`	Is this bag empty?
`Iterator<Item>`	`iterator()`	Returns an iterator that iterates over the items in the bag in arbitrary order.
`static void`	`main(String[] args)`	Unit tests the `ResizingArrayBag` data type.
`int`	`size()`	Returns the number of items in this bag.

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Constructor Detail
  - ResizingArrayBag
```
public ResizingArrayBag()
```
    Initializes an empty bag.
- Method Detail
  - isEmpty
```
public boolean isEmpty()
```
    Is this bag empty?
    
    Returns:
    
    true if this bag is empty; false otherwise
  - size
```
public int size()
```
    Returns the number of items in this bag.
    
    Returns:
    
    the number of items in this bag
  - add
```
public void add(Item item)
```
    Adds the item to this bag.
    
    Parameters:
    
    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>
    
    Returns:
    
    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.
    
    Parameters:
    
    args - the command-line arguments