7 Ways to Iterate Through ArrayList in Java Loop

In loop through arraylist java, Question: How to iterate through an arraylist Java? This Article signify the use of ArrayList, Iterator and a List.here learn to java arraylist, iterate and array Examples.

There are 7 ways you can loop through arraylist java.

1. Simple For loop
2. Enhanced For loop
3. Iterator
4. ListIterator
5. While loop
6. Iterable.forEach() util
7. Stream.forEach() util

Also Read My Prev Article for convert a String to Char Array in Java and Paypal Payment Gateway Integration using Java

Java Example:

You required to JDK 13 to execute following program as

point-5

above uses simple Java include

stream()

util.

Example of loop through arraylist java

void

java.util.stream.Stream.forEach
(Consumer action) executes an action for each same element of Java program stream.


package pakainfo.com.tutorials;
 
import java.util.*;
 
/**
 * @author Pakainfo.com
 * How to iterate through Java List? Seven (7) ways to Iterate Through Loop in Java.
 * 1. Simple For loop
 * 2. Enhanced For loop
 * 3. Iterator
 * 4. ListIterator
 * 5. While loop
 * 6. Iterable.forEach() util
 * 7. Stream.forEach() util
 */
 
public class PakainfoIterateThroughList {
 
    public static void main(String[] argv) {
 
        // create list
        List pakainfoList = new ArrayList();
 
        // add 4 different values to list
        pakainfoList.add("Loans");
        pakainfoList.add("Mortgage");
        pakainfoList.add("Attorney");
        pakainfoList.add("Lawyer");
 
        // Other way to define list is - we will not use this list :)
        List pakainfoListNew = Arrays.asList("Loans", "Mortgage", "Attorney", "Lawyer");
 
        // Simple For loop
        System.out.println("==============> Way 1. Simple For loop Java Example.");
        for (int i = 0; i < pakainfoList.size(); i++) {
            System.out.println(pakainfoList.get(i));
        }
 
        // New Enhanced For loop
        System.out.println("\n==============> Way 2. New Enhanced For loop Java Example..");
        for (String temp : pakainfoList) {
            System.out.println(temp);
        }
 
        // Iterator - Returns an iterator over the elements in this list in proper sequence.
        System.out.println("\n==============> Way 3. Iterator Java Example...");
        Iterator pakainfoIterator = pakainfoList.iterator();
        while (pakainfoIterator.hasNext()) {
            System.out.println(pakainfoIterator.next());
        }
 
        // ListIterator - traverse a list of elements in either forward or backward order
        // An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration,
        // and obtain the iterator's current position in the list.
        System.out.println("\n==============> Way 4. ListIterator Java Example...");
        ListIterator pakainfoListIterator = pakainfoList.listIterator();
        while (pakainfoListIterator.hasNext()) {
            System.out.println(pakainfoListIterator.next());
        }
 
        // while loop
        System.out.println("\n==============> Way 5. While Loop Java Example....");
        int i = 0;
        while (i < pakainfoList.size()) {
            System.out.println(pakainfoList.get(i));
            i++;
        }
 
        // Iterable.forEach() util: Returns a sequential Stream with this collection as its source
        System.out.println("\n==============> Way 6. Iterable.forEach() Java Example....");
        pakainfoList.forEach((temp) -> {
            System.out.println(temp);
        });
 
        // collection Stream.forEach() util: Returns a sequential Stream with this collection as its source
        System.out.println("\n==============> Way 7. Stream.forEach() Java Example....");
        pakainfoList.stream().forEach((pakainfoTemp) -> System.out.println(pakainfoTemp));
    }
}

Output:
==============> Way 1. Simple For loop Java Example.
Loans
Mortgage
Attorney
Lawyer
 
==============> Way 2. New Enhanced For loop Java Example..
Loans
Mortgage
Attorney
Lawyer
 
==============> Way 3. Iterator Java Example...
Loans
Mortgage
Attorney
Lawyer
 
==============> Way 4. ListIterator Java Example...
Loans
Mortgage
Attorney
Lawyer
 
==============> Way 5. While Loop Java Example....
Loans
Mortgage
Attorney
Lawyer
 
==============> Way 6. Iterable.forEach() Java Example....
Loans
Mortgage
Attorney
Lawyer
 
==============> Way 7. Stream.forEach() Java Example....
Loans
Mortgage
Attorney
Lawyer
 
Process finished with exit code 0

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