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

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Iterate Through Loop in 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[php](Consumer<? super String> action) executes an action for each same element of Java program stream.</p>

[php]
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<String> pakainfoList = new ArrayList<String>();
 
        // 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<String> 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<String> 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<String> 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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