![]() ![]() Introduction To Java Servlets and Its Life-Cycle Lesson - 26ġ0 Best Java Frameworks You Should Know in 2021 Lesson - 27 What is Java API and The Need for Java APIs? Lesson - 25 What Is Java JDBC? The Complete Reference Lesson - 24 What is Exception Handling in Java? Lesson - 23 Java EE Tutorial: All You Need To Know About Java EE Lesson - 22 Top 25 Pattern Programs in Java For Printing Numbers Lesson - 21 ![]() Java vs JavaScript: Know The 8 Major Differences Lesson - 20 Python: Which is the Best Programming Language? Lesson - 19 The Differences Between C++ and Java That You Need To Know Lesson - 18 Your One-Stop Solution for Multithreading in Java Lesson - 17 What is a Java Lambda Expression and How to Implement It? Lesson - 16 What is Polymorphism in Java and How to Implement It? Lesson - 15 What is Java Interface and Why it's Needed? Lesson - 14 What is Inheritance in Java and How to Implement It Lesson - 13 What is an Abstract Class in Java and How to Implement It? Lesson - 12 What is Encapsulation in Java and How to Implement It? Lesson - 11 How to Implement the Revolutionary OOPs Concepts in Java Lesson - 10 What Are Java Classes and Objects and How Do You Implement Them? Lesson - 9 What Are Java Collections and How to Implement Them? Lesson - 8 What Are Java Strings And How to Implement Them? Lesson - 6Īrrays In Java: Declare, Define, and Access Array Lesson - 7 How to Get Started With Eclipse IDE? Lesson - 5 One-Stop Solution for Java Installation in Windows Lesson - 4 ![]() What Is JDK in Java? Why Do We Need It? Lesson - 3 What is Java: A Beginners Guide To Java Lesson - 2 This interface also has special powers: the Java statement for (var x: a) is defined to work only when a is an array or is of a class implementing Iterable.Ī collection is something that (1) can be added to and removed from, (2) can be asked for its size and whether it is empty, (3) has a membership test, (4) can have its items streamed, and (5) can have its items dumped into an array.10 Reasons That Explain Why You Need to Learn Java Lesson - 1 If something is iterable, you can (1) obtain an iterator for it, (2) obtain a spliterator for it, and (3) iterate over it with its forEach method. Read in order to get the “big picture” sense of what each of the interfaces and classes provide. These notes are provided more as a reference than a tutorial. These will be explained when we get to examples. You’ll see some scary-looking syntax, like, ,, and type names such as Supplier, Consumer, and Predicate. Now it’s time to describe what each interface is all about. HashMap, LinkedHashMap, EnumMap, IdentityHashMap, WeakHashMap HashSet, LinkedHashSet, EnumSet, CopyOnWriteArraySetĪrrayList, LinkedList, CopyOnWriteArrayListĪrrayDeque, ConcurrentLinkedDeque, LinkedListĪrrayBlockingQueue, LinkedBlockingQueue, PriorityBlockingQueue, SynchronousQueue, DelayQueue For now, just look at the names and get a sense of what’s there descriptions are coming up very soon. Here are almost all of the classes, organized by the interfaces they implement (we’ve left out the crazy-specific ones, like JobStateReasons). Next, get a feel for the fact that there are quite a few implementations for each of the interfaces. Start by learning the names of following main interfaces (hang in there, well see descriptions later): The official documentation comes with some decent reads. Let’s get a big picture and look at a few examples. So many collections come with the Java Core API. Blocking Some will block the current thread until an operation can be performed, others will throw an exception or return an error value immediately if an operation cannot be performed.Thread safety Some will allow multiple threads to operate on the collection at the same time without interleaving sub-operations that would generate inconsistencies other provide no such guarantees. ![]() Access Some restrict the access patterns, others allow arbitrary access.Mutability Some cannot have their elements updated, some can.Resizability Some can grow and shrink, some have a fixed size.Ordering Some are (internally) ordered, some are unordered.Uniqueness Some allow duplicate elements, some do not.Arrangement Some are arranged linearly (sequences), some hierarchically (trees), some without arrangement (sets), and some arbitrary arrangements (graphs).Before we look at specific collections, let’s take a minute to appreciate how wild the scope of variations is when it comes to collections: There a so many variations on how a collection’s elements are arranged, and what operations are allowed. What is a Collection?Ī collection is an object that holds a group of objects. As a serious and popular enterprise programming language, Java’s standard library has a huge number of interfaces and classes for collections. ![]()
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