How To Loop Arraylist Inward Coffee - Listing Itrator Traversal Code Example

Looping ArrayList inwards Java or Iteration over ArrayList is really like to looping Map inwards Java. In social club to loop ArrayList inwards Java nosotros tin terminate purpose either foreach loop, uncomplicated for loop or Java Iterator from ArrayList. We accept already touched iterating ArrayList inwards 10 Example of ArrayList inwards Java too nosotros volition run across hither inwards detail. We are going to run across examples of all 3 approaches inwards this ArrayList tutorial too notice out which i is build clean too best method of looping arraylist inwards Java. Before start writing an instance for loop inwards ArrayList let's mean value why create nosotros involve to iterate, traverse or loop an ArrayList if it’s based on index too backed past times Array. If nosotros know the index of chemical component than nosotros tin terminate take larn that exceptional chemical component from ArrayList only if y'all desire to impress all elements of arraylist too create roughly performance i past times i on each of them, solely looping or traversing volition handle you.

This article is inwards continuation of my before tutorial on ArrayList e.g. How to kind ArrayList inwards Java on descending order too How to convert Array to ArrayList inwards Java. If y'all haven’t read them already thence y'all may notice them useful too interesting.


How to Loop, Iterate or traverse Arraylist inwards Java - Code Example

 Essentially at that topographic point are four ways to iterate, traverse of loop ArrayList inwards Java:
1) Looping using Java5 foreach loop.
2) Looping ArrayList using for loop too size() method.
3) Iterating ArrayList using Iterator.
4) Traversing ArrayList using ListIterator inwards Java.


Looping ArrayList alongside foreach loop on Java 5

We are going to run across examples of all 3 approaches inwards this ArrayList tutorial too notice How to loop ArrayList inwards Java - List Itrator Traversal Code ExampleJava Iterator for looping or iterating over ArrayList. Since ArrayList provides size() method y'all tin terminate besides purpose plainly one-time for(int i; i<size; i++) loop besides for iterating or traversing ArrayList inwards Java. See instance department postal service for consummate code instance of looping ArrayList inwards Java.

Iterating ArrayList inwards Java using Iterator too acre loop

Another cool approach of looping ArrayList is using Iterator inwards combination of while loop too traverse until y'all larn to the terminate of ArrayList. Iterator has a method hasNext() which volition render truthful until at that topographic point is an chemical component inwards Iterator. Always telephone telephone hasNext() before calling next() method on Iterator to avoid java.util.NoSuchElementException. Also past times using Iterator approach for looping ArrayList y'all tin terminate withdraw chemical component from ArrayList without fearfulness of ConcurrentModificationException. See below for total code example of looping ArrayList inwards Java.

package test;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;

public class ArrayListLoopExample {

    public static void main(String args[]){
     
        //Creating Arraylist for loop example
        ArrayList<String> loopList = new ArrayList<String>();
     
        //Storing elements inwards Java Arraylist
        loopList.add("low toll personal loan");
        loopList.add("cheap personal loan");
        loopList.add("personal loan inwards 24 hours");
     
        //Loop Arraylist using foreach loop of JDK1.5
        System.out.println("=====================================================");
        System.out.println("ArrayList Loop Example using foreach loop of JDK 1.5");
        for(String element: loopList){
            System.out.println(element);
        }
     
        //Loop Arraylist using uncomplicated for loop too size method
        System.out.println("=====================================================");
        System.out.println("ArrayList Loop Example using for loop too size()");
        for(int i=0; i<loopList.size(); i++){
            System.out.println(loopList.get(i));
        }
     
        //Iterate Arraylist using iterator too acre loop inwards Java
        System.out.println("=====================================================");
        System.out.println("ArrayList Loop Example using Iterator too acre loop");
        Iterator<String> iterator = loopList.iterator();
        while(iterator.hasNext()){
            System.out.println(iterator.next());
        }
     
        //Iterate Arraylist using ListIterator too acre loop inwards Java
        System.out.println("=====================================================");
        System.out.println("ArrayList Loop Example using ListIterator too acre loop");
        ListIterator<String> listIterator = loopList.listIterator();
        while(listIterator.hasNext()){
            System.out.println(listIterator.next());
        }
    }
}

Output:
=====================================================
ArrayList Loop Example using foreach loop of JDK 1.5
depression toll personal loan
inexpensive personal loan
personal loan inwards 24 hours
=====================================================
ArrayList Loop Example using for loop too size()
depression toll personal loan
inexpensive personal loan
personal loan inwards 24 hours
=====================================================
ArrayList Loop Example using Iterator too while loop
depression toll personal loan
inexpensive personal loan
personal loan inwards 24 hours
=====================================================
ArrayList Loop Example using ListIterator too while loop
depression toll personal loan
inexpensive personal loan
personal loan inwards 24 hours

That’s all on four instance to loop ArrayList inwards Java. We accept seen foreach loop, Iterator too other approaches for traversing ArayList too inwards my thought foreach loop rules for uncomplicated iteration too Iterator rules if y'all involve to withdraw elements from ArrayList during iteration.ListIterator besides offers add() method to add together novel elements inwards ArrayList acre looping.

Further Learning
Java In-Depth: Become a Complete Java Engineer
Difference betwixt Hashtable too HashMap inwards Java
Difference betwixt Concurrent Collection too Synchronized Collection inwards Java
Top ten Collection interview questions inwards Java
10 Example of Hashtable inwards Java
How to convert ArrayList to HashSet inwards Java
Difference betwixt Iterator too Enumeration inwards Java
Difference betwixt fail-safe too fail-fast Iterator inwards Java

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