Java Program to Iterate over an ArrayList

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In this article, we will understand how to iterate over an ArrayList. The ArrayList class is a resizable array, which can be found in the java. util package. The difference between a built-in array and an ArrayList in Java, is that the size of an array cannot be modified.

Below is a demonstration of the same −

Suppose our input is

Run the program

The desired output would be

A elements of the list are:
50 100 150 200 250 300 350

Algorithm

Step 1 - START
Step 2 - Declare namely
Step 3 - Define the values.
Step 4 - Create a list of integers and initialize elements in it.
Step 5 - Display the list on the console.
Step 6 - Iterate over the elements, and fetch each element using ‘get’ method.
Step 7 - Display this on the console.
Step 6 - Stop

Example 1

Here, we bind all the operations together under the ‘main’ function.

import java.util.*;
public class Demo {
   public static void main(String[] args){
      System.out.println("The required packages have been imported");
      List<Integer> numbers = Arrays.asList(50, 100, 150, 200, 250, 300, 350);
      System.out.println("A list is declared");
      System.out.println("\nA elements of the list are: ");
      for (int i = 0; i < numbers.size(); i++)
         System.out.print(numbers.get(i) + " ");
   }
}

Output

The required packages have been imported
A list is declared

A elements of the list are:
50 100 150 200 250 300 350

Example 2

Here, we encapsulate the operations into functions exhibiting object oriented programming.

import java.util.*;
public class Demo {
   static void multiply(List<Integer> numbers){
      System.out.println("\nA elements of the list are: ");
      for (int i = 0; i < numbers.size(); i++)
         System.out.print(numbers.get(i) + " ");
   }
   public static void main(String[] args){
      System.out.println("The required packages have been imported");
      List<Integer> input_list = Arrays.asList(50, 100, 150, 200, 250, 300, 350);
      System.out.println("A list is declared");
      multiply(input_list);
   }
}

Output

The required packages have been imported
A list is declared

A elements of the list are:
50 100 150 200 250 300 350
raja
Updated on 30-Mar-2022 09:01:40

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