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Java Topic Practice

ArrayList Basics

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ArrayList Basics MCQ Practice

ArrayList Basics Java practice with 15 questions, code tracing, and a worked explanation for every answer.

Question 1 of 15

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Code Tracing 01 - ArrayList Basics: track the final printed value.

import java.util.ArrayList;
public class Main {
  public static void main(String[] args) {
    ArrayList<Integer> nums = new ArrayList<Integer>();
    nums.add(3);
    nums.add(7);
    nums.add(3);
    nums.add(9);
    nums.add(5);
    nums.set(1, nums.get(0) + nums.get(2));
    int moved = nums.remove(3);
    nums.add(1, moved);
    int total = 0;
    for (int i = 0; i < nums.size(); i++) {
      if (i % 2 == 0) total += nums.get(i);
      else total -= nums.get(i);
    }
    System.out.print(nums + ":" + total);
  }
}
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