Java Program To Square All Items In List

Chapter: Miscellaneous Last Updated: 17-05-2023 15:12:46 UTC

Program:

            /* ............... START ............... */
                import java.util.ArrayList;
import java.util.List;

public class SquareListItemsExample {
    public static void main(String[] args) {
        // Create a list
        List<Integer> numbers = new ArrayList<>();
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
        numbers.add(4);
        numbers.add(5);

        // Square all items in the list
        for (int i = 0; i < numbers.size(); i++) {
            int squared = numbers.get(i) * numbers.get(i);
            numbers.set(i, squared);
        }

        // Print the squared list
        System.out.println("Squared list: " + numbers);
    }
}

                /* ............... END ............... */
        

Output

Squared list: [1, 4, 9, 16, 25]

Notes:

• In this example, we create an ArrayList called numbers and add some integer values to it.
• To square all items in the list, we use a for loop to iterate over each element. For each element, we retrieve its value using numbers.get(i), square it by multiplying it with itself, and store the squared value in a variable called squared. Then, we use the numbers.set(i, squared) method to update the element in the list with its squared value.
• After squaring all items in the list, we print the squared list using System.out.println(), which displays the squared list as [1, 4, 9, 16, 25].
• So, the program demonstrates how to square all items in a list by iterating over each element and updating it with its squared value in Java.

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