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Click on the "run example" button to see how it works. we recommend reading this tutorial, in the sequence listed in the left menu. java is an object oriented language and some concepts may be new. take breaks when needed, and go over the examples as many times as needed. Java hashmap. in the arraylist chapter, you learned that arrays store items as an ordered collection, and you have to access them with an index number (int type). a hashmap however, store items in "key value" pairs, and you can access them by an index of another type (e.g. a string). Collection (capital c): it is actually the java.util.collection interface from which set, list, and queue extend. collections (capital c and ends with s): it is the java.util.collections class that holds a pile of static utility methods for use with collections. there are some other classes in collection framework which do not extend collection. Java arraylist. the arraylist class is a resizable array, which can be found in the java.util package the difference between a built in array and an arraylist in java, is that the size of an array cannot be modified (if you want to add or remove elements to from an array, you have to create a new one). Java hashset. a hashset is a collection of items where every item is unique, and it is found in the java.util package: example. create a hashset object called cars that will store strings: import java.util.hashset; hashset<string> cars = new hashset<string>();.
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Java iterator. an iterator is an object that can be used to loop through collections, like arraylist and hashset. it is called an "iterator" because "iterating" is the technical term for looping. to use an iterator, you must import it from the java.util package. Java collection: arraylist exercises [22 exercises with solution] 1. write a java program to create a new array list, add some colors (string) and print out the collection. go to the editor click me to see the solution. 2. write a java program to iterate through all elements in a array list. go to the editor click me to see the solution. 3. Collection interface. iterator interface. the collection in java is a framework that provides an architecture to store and manipulate the group of objects. java collections can achieve all the operations that you perform on a data such as searching, sorting, insertion, manipulation, and deletion. java collection means a single unit of objects.
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Java Collections | Collections Framework In Java | Java Tutorial For Beginners | Edureka