Question

So here is my program:

Create an ArrayList that will only contain strings
Add the following to the list in order

• Mary
• John
• Mahendra
• Sara
• Jose
• Judy

Print the list using the enhanced for loop
Insert Harry in front of Mahendra and after John
Then Remove position 4 from the list

Here’s what I’ve written:

import java.util.ArrayList;
import java.util.Scanner;

public class Name {
    public static void main(String[] args) {
        ArrayList<String> names = new ArrayList<String>();
        Scanner input = new Scanner(System.in);
        names.add(input.nextLine());
        names.add(input.nextLine());
        names.add(input.nextLine());
        names.add(input.nextLine());
        names.add(input.nextLine());
        names.add(input.nextLine());
        names.add(input.nextLine());

        for (String n : names) {
        System.out.println(n);
        }
    }
}

I guess I’m having problems with adding and removing. I believe everything else should be fine though.

Answer 1

You may want to use below methods to insert and remove:

void    add(int index, E element)
 E      remove(int index)

e.g. Mahendra is at index 2(index starts from 0), then to add Harry in front of Mahendra, just do as below:

  names.add(2, "Harry"); //This will push Mahendra at index 3

To remove crrent index 4,

  names.remove(4);

To remove previous index 4, which has become index 5 now,

  names.remove(5);