Add items to list in for loop java

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There are 7 ways you can iterate through List.
Java Example:
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How to iterate through Java List? This tutorial demonstrates the use of ArrayList, Iterator and a List.

There are 7 ways you can iterate through List.

Simple For loop
Enhanced For loop
Iterator
ListIterator
While loop
Iterable.forEach() util
Stream.forEach() util

Java Example:

You need JDK 13 to run below program as point-5 above uses stream() util.

void java.util.stream.Stream.forEach(Consumer action) performs an action for each element of this stream.

CrunchifyIterateThroughList.java

Java

package crunchify.com.tutorials;

import java.util.*;

/**

* @author Crunchify.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 CrunchifyIterateThroughList {

public static void main(String[] argv) {

// create list

List crunchifyList = new ArrayList();

// add 4 different values to list

crunchifyList.add("Facebook");

crunchifyList.add("Paypal");

crunchifyList.add("Google");

crunchifyList.add("Yahoo");

// Other way to define list is - we will not use this list :)

List crunchifyListNew = Arrays.asList("Facebook", "Paypal", "Google", "Yahoo");

// Simple For loop

System.out.println("==============> 1. Simple For loop Example.");

for (int i = 0; i < crunchifyList.size(); i++) {

System.out.println(crunchifyList.get(i));

}

// New Enhanced For loop

System.out.println("\n==============> 2. New Enhanced For loop Example..");

for (String temp : crunchifyList) {

System.out.println(temp);

}

// Iterator - Returns an iterator over the elements in this list in proper sequence.

System.out.println("\n==============> 3. Iterator Example...");

Iterator crunchifyIterator = crunchifyList.iterator();

while (crunchifyIterator.hasNext()) {

System.out.println(crunchifyIterator.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==============> 4. ListIterator Example...");

ListIterator crunchifyListIterator = crunchifyList.listIterator();

while (crunchifyListIterator.hasNext()) {

System.out.println(crunchifyListIterator.next());

}

// while loop

System.out.println("\n==============> 5. While Loop Example....");

int i = 0;

while (i < crunchifyList.size()) {

System.out.println(crunchifyList.get(i));

i++;

}

// Iterable.forEach() util: Returns a sequential Stream with this collection as its source

System.out.println("\n==============> 6. Iterable.forEach() Example....");

crunchifyList.forEach((temp) -> {

System.out.println(temp);

});

// collection Stream.forEach() util: Returns a sequential Stream with this collection as its source

System.out.println("\n==============> 7. Stream.forEach() Example....");

crunchifyList.stream().forEach((crunchifyTemp) -> System.out.println(crunchifyTemp));

}

Output:

==============> 1. Simple For loop Example.

Facebook

Paypal

Google

Yahoo

==============> 2. New Enhanced For loop Example..

Facebook

Paypal

Google

Yahoo

==============> 3. Iterator Example...

Facebook

Paypal

Google

Yahoo

==============> 4. ListIterator Example...

Facebook

Paypal

Google

Yahoo

==============> 5. While Loop Example....

Facebook

Paypal

Google

Yahoo

==============> 6. Iterable.forEach() Example....

Facebook

Paypal

Google

Yahoo

==============> 7. Stream.forEach() Example....

Facebook

Paypal

Google

Yahoo

Process finished with exit code 0

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Add items to list in for loop java

There are 7 ways you can iterate through List.

Java Example:

Output:

Join the Discussion

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