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Java Program to Iterate over ArrayList using Lambda Expression
In this article, we will understand how to iterate over ArrayList using lambda expression. 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 −
The list is defined as: Java Python Scala Mysql Redshift
Algorithm
Step 1 - START Step 2 - Declare namely Step 3 - Define the values. Step 4 - Create an ArrayList, and iterate over it, and display it. Step 5 - In the ArrayList, add elements using the ‘add’ method. Step 6 - Display this on the console. Step 7 - Use the ‘forEach’ loop to iterate over the elements, and display them. Step 8 - Stop
Example 1
Here, we bind all the operations together under the ‘main’ function.
import java.util.ArrayList;
public class Demo {
public static void main(String[] args) {
System.out.println("The required packages have been imported");
ArrayList<String> input_list = new ArrayList<>();
input_list.add("Java");
input_list.add("Python");
input_list.add("Scala");
input_list.add("Mysql");
input_list.add("Redshift");
System.out.print("\nThe list is defined as: ");
input_list.forEach((e) -> {
System.out.print(e + " ");
});
}
}Output
The required packages have been imported The list is defined as: Java Python Scala Mysql Redshift
Example 2
Here, we encapsulate the operations into functions exhibiting object oriented programming.
import java.util.ArrayList;
public class Demo {
static void print(ArrayList<String> input_list){
System.out.print("\nThe list is defined as: ");
input_list.forEach((e) -> {
System.out.print(e + " ");
});
}
public static void main(String[] args) {
System.out.println("The required packages have been imported");
ArrayList<String> input_list = new ArrayList<>();
input_list.add("Java");
input_list.add("Python");
input_list.add("Scala");
input_list.add("Mysql");
input_list.add("Redshift");
print(input_list);
}
}Output
The required packages have been imported The list is defined as: Java Python Scala Mysql Redshift
Updated on: 30-Mar-2022
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