Java Arraylist Examples For Programmers

ArrayList Example inward Java

In this Java ArrayList Example nosotros volition meet how to add together elements inward ArrayList, how to take elements from ArrayList, ArrayList contains Example too several other ArrayList functions which nosotros job daily. ArrayList is i of the almost pop degree from Java Collection framework along alongside HashSet too HashMap too a skillful agreement of ArrayList degree too methods is imperative for Java developers. ArrayList is an implementation of List Collection which is ordered too allow duplicates.  ArrayList is alos index based too provides constant fourth dimension functioning for mutual methods e.g. get().Apart from real pop amidst Java programmers, ArrayList is too a real pop interview topic. Questions similar Difference betwixt Vector too ArrayList too LinkedList vs ArrayList is hugely pop on diverse Java interview peculiarly alongside two to three years of experience. Along alongside Vector this is i of the showtime collection degree many Java programmer use. By the agency e convey already seen only about ArrayList tutorial e.g. ArrayList sorting example,  converting Array to ArrayList,  looping through ArrayList which is skillful to empathise ArrayList inward Java.

Java ArrayList Examples

In this department nosotros volition meet actual code instance of diverse ArrayList functionality e.g. add, remove, contains, clear, size, isEmpty etc.

  

import java.util.ArrayList;
import java.util.Arrays;

/**
 *
 * Java ArrayList Examples - listing of oftentimes used examples inward ArrayList e.g. adding
 * elements, removing elements, contains examples etc
 * @author
 */
public class ArrayListTest {

    public static void main(String args[]) {
     
        //How to practise ArrayList inward Java - example
        ArrayList<String> listing = new ArrayList<String>();
     
        //Java ArrayList add together Examples
        list.add("Apple");
        list.add("Google");
        list.add("Samsung");
        list.add("Microsoft");
   
        //Java ArrayList contains Example, equals method is used to depository fiscal establishment jibe if
        //ArrayList contains an object or not
        System.out.println("Does listing contains Apple :" + list.contains("Apple"));
        System.out.println("Does listing contains Verizon :" + list.contains("Verizon"));
     
        //Java ArrayList Example - size
        System.out.println("Size of ArrayList is : " + list.size());
     
        //Java ArrayList Example - replacing an object
        System.out.println("list earlier updating : " + list);
        list.set(3, "Bank of America");
        System.out.println("list afterward update : " + list);
     
        //Java ArrayList Example - checking if ArrayList is empty
        System.out.println("Does this ArrayList is empty : " + list.isEmpty());
     
        //Java ArrayList Example - removing an Object from ArrayList
        System.out.println("ArrayList earlier removing chemical constituent : " + list);
        list.remove(3); //removing quaternary object inward ArrayList
        System.out.println("ArrayList afterward removing chemical constituent : " + list);
     
       //Java ArrayList Example - finding index of Object inward List
        System.out.println("What is index of Apple inward this listing : " + list.indexOf("Apple"));
     
        //Java ArrayList Example - converting List to Array
        String[] array = list.toArray(new String[]{});
        System.out.println("Array from ArrayList : " + Arrays.toString(array));
     
        //Java ArrayList Example : removing all elements from ArrayList
        list.clear();
        System.out.println("Size of ArrayList afterward clear : " + list.size());
    }
 
}

Output:
Does listing contains Apple :true
Does listing contains Verizon :false
Size of ArrayList is : 4
listing earlier updating : [Apple, Google, Samsung, Microsoft]
listing afterward update : [Apple, Google, Samsung, Bank of America]
Does this ArrayList is empty : false
ArrayList earlier removing chemical constituent : [Apple, Google, Samsung, Bank of America]
ArrayList afterward removing chemical constituent : [Apple, Google, Samsung]
What is index of Apple inward this listing : 0
Array from ArrayList : [Apple, Google, Samsung]
Size of ArrayList afterward clear : 0

These were only about frequently used examples of ArrayList inward Java. We convey seen ArrayList contains example which used equals method to depository fiscal establishment jibe if an Object is acquaint inward ArrayList or not. We convey too meet how to add, take too alteration contents of ArrayList etc.

Further Learning
Java In-Depth: Become a Complete Java Engineer
HashMap vs Hashtable inward Java

HashMap vs HashSet inward Java

TreeSet vs TreeMap inward Java

HashMap vs ConcurrentHashMap inward Java

What is CopyOnWriteArrayList inward Java