Update elements in a list

UpdateElementsInList.java

import java.util.ArrayList;
import java.util.List;

public class UpdateElementsInList {
    public static void main(String[] args) {
        List<Integer> intList = new ArrayList<>(List.of(1, 2, 3));

        // all elements will be updated
        // output: [2, 4, 6]
        intList.replaceAll(e -> e * 2);
        System.out.println(intList);

        List<String> strList = new ArrayList<>(List.of("java", "is", "awesome"));

         /*
         // this will update all string to be all caps
            you can also use Method reference
            strList.replaceAll(String::toUpperCase);
            output: [JAVA, IS, AWESOME]
         */
        strList.replaceAll(e -> e.toUpperCase());
        System.out.println(strList);


        // will update element at index 0 to be 9999
        // output: [9999, 4, 6]
        intList.set(0, 9999);
        System.out.println(intList);
    }
}