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November 4, 2020 17:34
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// https://crunchify.com/how-to-iterate-through-java-list-4-way-to-iterate-through-loop/ | |
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 MyClass { | |
public static void main(String args[]) { | |
// create list | |
List<String> crunchifyList = new ArrayList<String>(); | |
// 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<String> 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<String> 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<String> 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)); | |
} | |
} |
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