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16 October, 17:09

Write a program that adds the numbers 1 through 5 into the numbers ArrayList and then prints out the first element in the list.

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Answers (1)
  1. 16 October, 17:36
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    Answer code is given below along with comments to explain each step

    Explanation:

    Method 1:

    / / size of the array numbers to store 1 to 5 integers

    int Size = 5;

    / / here we have initialized our array numbers, the type of array is integers and size is 5, right now it is empty.

    ArrayList numbers = new ArrayList (Size);

    / / lets store values into the array numbers one by one

    numbers. add (1)

    numbers. add (2)

    numbers. add (3)

    numbers. add (4)

    numbers. add (5)

    / / here we are finding the first element in the array numbers by get () function, the first element is at the 0th position

    int firstElement = numbers. get (0);

    / / to print the first element in the array numbers

    System. out. println (firstElement);

    Method 2:

    int Size = 5;

    ArrayList numbers = new ArrayList (Size);

    / / here we are using a for loop instead of adding manually one by one to store the values from 1 to 5

    for (int i = 0; i < Size; i++)

    {

    / / adding the values 1 to 5 into array numbers

    numbers. add (i);

    }

    //here we are finding the first element in the array numbers

    int firstElement = numbers. get (0);

    / / to print the first element in the array

    System. out. println (firstElement);
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