Java Certified Foundations Associate: Java Arrays & ArrayLists

IN THIS COURSE

• 1.  Course Overview
  1m 27s
  In this video, you’ll learn more about the course and your instructor. You’ll learn how arrays and array lists are designed to handle looping through lists of data. First, you’ll discover arrays and the array lists class. Next, you’ll explore the iterator interface and how it can be used to process lists of data. Finally, you’ll learn about special classes used to store and retrieve lists of data. FREE ACCESS
• 2.  Java Arrays and ArrayLists
  3m 34s
  In this video, you’ll learn more about Java Arrays and ArrayLists. An array in Java is the container you put values in. It has a fixed length, a fixed number of elements can be put into it, and must be of a single type. If you create an array for integers, you can't put strings in it. When the array is created, the length or size is fixed. It can hold primitive types or objects. FREE ACCESS
• 3.  Java Arrays
  5m 21s
  In this video, you’ll learn about Java Arrays and how they're used. First, you’ll look at Array declaration and creation. To declare an Array of integers, you’ll specify the Array with an open and closed bracket along with the type. Onscreen, you’ll see an open and closed bracket, and the name of the Array, myArray. To create an integer array, an int array, you have myArray = new int and then you’ll specify the size. FREE ACCESS
• 4.  Programming Java Arrays
  6m 37s
  In this video, you’ll watch a demo on the standard array syntax used within Java. You’ll start inside the typical main function. On the first line inside the function on line 6, you’ll see int [] ages = { 39, 27, 97 } ;. This means you’ll create an array called ages of type int, with three elements initialized to 39, 27, and 97. The double brackets after the int say you’re declaring an array. FREE ACCESS
• 5.  Java ArrayList
  5m 14s
  In this video, you’ll important details to keep in mind about ArrayLists and how they're used within Java. ArrayLists are created to hold a single type of element. The ArrayList is parameterized to hold a type of object. ArrayLists are also resizeable. They can grow as needed as more elements are inserted. ArrayLists are part of the java.util package, you’ll import java.util.ArrayList to include them. These are slower than regular arrays, because of added functionality. FREE ACCESS
• 6.  Programming Java ArrayList
  4m 36s
  In this video, you’ll watch a demo. You’ll learn how ArrayLists are used within Java. ArrayLists are resizeable array implementations. They provide features you don't get in a conventional array. On line 1, you’ll see the package com.example. You’ll import import java.util.ArrayList, then import java.util.Arrays, import java.util.Collections, and import java.util.List. On line 11, your code begins. FREE ACCESS
• 7.  Java Iterator
  3m 33s
  In this video, you’ll watch a demo. You’ll learn about the iterator interface and how it's used within Java collection classes. The Java iterator interface is part of the collection framework in Java. It's used to retrieve elements and step over or traverse them. There are three iterator types. These include the enumeration, the iterator, and list iterator. You’ll also learn more about the hasNext method. FREE ACCESS
• 8.  Java LinkedList
  4m 3s
  In this video, you’ll learn about the LinkedList class and how it's used within Java. The LinkedList class is similar to ArrayList. However, it’s used for different types of problems or programming design patterns. LinkedList contains objects of the same type. It's parameterized by a particular type of object and some of the same methods as ArrayList. With LinkedList, it’s easy to add and remove elements to the front or the back of the list. FREE ACCESS
• 9.  Programming Java LinkedList
  6m 1s
  In this video, you’ll watch a demo on how the LinkedList class is used within Java. Onscreen, you’ll see a file, Main.java, which is in the package com.example. You’ll see an import, java.util.LinkedList. This is a member of the Java collections framework. It's a type of collection or container of elements that can be used as a stack, list, or queue data structure. It's implemented as a doubly-linked list, with forward and backward iterators. FREE ACCESS
• 10.  Java HashMap
  4m 25s
  In this video, you’ll learn about Java's HashMap class. A HashMap stores elements in key/value pairs like an associative array, where the key identifies the value. Instead of a numeric index, the key is a unique object, or a string is used for a name that indexes the value. Objects are accessible by an index defined by the key. The reason it's called a HashMap is because the key is hashed to find the value. FREE ACCESS
• 11.  Programming Java HashMap
  5m 55s
  In this video, you’ll watch a demo on how a HashMap class is used within Java. A HashMap is an associative array type of data structure. It allows for the constant time key base insertion and retrieval of elements. However, the order of the elements is not guaranteed and does not stay constant over time. The basic put and get operations are what HashMap excels at. FREE ACCESS
• 12.  Java HashSet
  3m 2s
  In this video, you’ll learn about Java's HashSet Class. The HashSet is a collection of elements. It’s a container that contains unique elements of a particular type, it’s parameterized when you create the object. Duplicate elements are not permitted in a HashSet, so it's a unique collection of elements. If you try to add something that already exists, nothing happens. It also implements the Set interface, which is a member of the Java collections framework. FREE ACCESS
• 13.  Programming Java HashSet
  3m 33s
  In this video, you’ll watch a demo on how the HashSet class is used in Java. You’ll see the HashSet provides for fast insertion and removal. It also makes it easy to check the existence of an element in the set. You can also quickly check the size of the set at any given time. However, it's not an appropriate container for ordering nor traversing in a particular order. FREE ACCESS
• 14.  Course Summary
  35s
  In this video, you’ll summarize what you’ve learned in the course. You discovered how Arrays and ArrayLists are designed to handle looping through lists of data. You also explored programming Java arrays and ArrayLists, using Java Iterators and LinkedLists, and programming Java HashMap and HashSet. FREE ACCESS