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Java Program to Iterate over an ArrayList
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
Updated on: 30-Mar-2022
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