Question

Modify the existing ArrayLists's contents, by erasing the second element, then inserting 100 and 102 in the shown locations. Use ArrayList's remove() and add() only. Sample ArrayList content of below program:

100 101 102 103 

import java.util.ArrayList;

public class ArrayListADT {

public static void main (String [] args) {
ArrayList<Integer> numsList = new ArrayList<Integer>();
int numOfElem = 4;

numsList.add(101);
numsList.add(200);
numsList.add(103);

  /* Your solution goes here */
   numsList.remove(1);
numsList.add(0, 100);
numsList.add(2, 102);
printArray(numsList, numOfElem);
return;

}
}

Fix the error.

ArrayListADT.java:21: error: cannot find symbol

printArray(numsList, numOfElem);

^

symbol: method printArray(ArrayList<Integer>,int)

location: class ArrayListADT

1 error

Answer 1

import java.util.ArrayList;

public class ArrayListADT {

    public static void main(String[] args) {
        ArrayList<Integer> numsList = new ArrayList<Integer>();
        int numOfElem = 4;

        numsList.add(101);
        numsList.add(200);
        numsList.add(103);

        numsList.remove(1);
        numsList.add(0, 100);
        numsList.add(2, 102);
        printArray(numsList, numOfElem);
        return;

    }

    public static void printArray(ArrayList<Integer> numbers, int size) {
        for (int i = 0; i < numbers.size(); i++) {
            System.out.print(numbers.get(i) + " ");
        }
        System.out.println();
    }
}