Question

2) Write a complete program in which main creates two Integer arrayLists and then adds 1, 2, , 10 to the first ArrayList, and 21, 22, ^, 30 to the second ArrayList. main should call a method passing it the two ArrayLists. This method should create and return a third ArrayList, each slot of which contains the sum of the values in the corresponding slots of the first and second ArrayLists. On return to main, main should display the values in the third ArrayList.

Answer 1

import java.util.ArrayList;

public class ArrayListSum {
  static ArrayList<Integer> sum(ArrayList<Integer> a, ArrayList<Integer> b){
    ArrayList<Integer> res = new ArrayList<Integer>();
    for(int i = 0;i<a.size();i++){
      res.add(a.get(i)+b.get(i));
    }
    return res;
  }

  public static void main(String args[]){
    ArrayList<Integer> a = new ArrayList<Integer>();
    for(int i = 1;i<=10;i++){
      a.add(i);
    }
    ArrayList<Integer> b = new ArrayList<Integer>();
    for(int i = 21;i<=30;i++){
      b.add(i);
    }

    System.out.println(sum(a,b));
  }
}

$\color{blue}\underline{Output:}$

[22, 24, 26, 28, 30, 32, 34, 36, 38, 40]

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