Question

You can follow the discussion of the java.util package's ArrayList class from the textbook or the lecture, but I'm hoping you will be prompted to review the Java online documentation at:

https://docs.oracle.com/en/java/javase/11/docs/api/allclasses.html (Links to an external site.)

You can do this exercise mentally, but it might be better if you write a Java program to implement an ArrayList instance of type String by performing the following operations:

1. Instantiate an ArrayList containing type String members.
2. add "a"
3. add "day"
4. add "bad" at index 1
5. add "good"
6. add "day"
7. remove "bad"
8. add "any" at index 0
9. set "have" at index 0
10. remove at index 2

Answer 1

SOLUTION-
I have solve the problem in Java code with comments and screenshot for easy understanding :)

CODE-

//java code
// for ArrayList class
import java.util.ArrayList;
public class Main {
    /* main method */
    public static void main(String args[]) {

        /* Creating Array List of String type */
        ArrayList<String> lst = new ArrayList<>();

        /* adding elements */
        lst.add("a");
        lst.add("day");

        /* adding element at index 1 */
        lst.add(1, "bad");

        /* adding elements */
        lst.add("good");
        lst.add("day");

        /* removing element "bad" */
        lst.remove("bad");

        /* adding "any" at index 0 */
        lst.add(0, "any");

        /* setting "have" at index 0, previous element at 0 gets replaced */
        lst.set(0, "have");

        /* removing element at index 2 */
        lst.remove(2);
        String msg = "";
        /* Listing the message from array list */
        for (String element : lst) {
            msg += element + " ";
        }

        //printing the final message
        System.out.println("Final-Message: " + msg);
    }
}

SCREENSHOT-

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