Question

Create an ArrayList of Countries

- Create a class called Country.java.

- Instance variables include name (String), capital (String), and population (an int representing the population of the capital)

- Write a 3-arg constructor

- Write 3 accessor methods

- Write a toString method that returns the state/value of all instance variables.


- Test out your class:

- Step 1: Create an ArrayList of five countries.

- Step 2: Print out your ArrayList.

- Step 3: Remove one of the countries.

- Step 4: Print out your ArrayList again.

- Step 5: Create a new country and insert it in the middle of your ArrayList.

- Step 7: Print out your ArrayList again.

- Step 8: Change your last country to the country you removed in Step 3.

- Step 9: Print out your ArrayList again.

Answer 1

Step 1: Create an ArrayList of five countries by creating Country objects and adding them to the ArrayList.

Step 2: Print out your ArrayList by looping through it and printing out each Country object's toString() method.

Step 3: Remove one of the countries from the ArrayList by using the remove() method and passing in the index of the object you wish to remove.

Step 4: Print out your ArrayList again by looping through it and printing out each Country object's toString() method.

Step 5: Create a new country and insert it in the middle of your ArrayList by creating a Country object and using the add() method with the index of the position in the ArrayList.

Step 6: Print out your ArrayList again by looping through it and printing out each Country object's toString() method.

Step 7: Change your last country to the country you removed in Step 3 by first removing the last country from the ArrayList, creating a new Country object using the same parameters as the one you removed earlier, then using the add() method with the index of the last position in the ArrayList.

Step 8: Print out your ArrayList again by looping through it and printing out each Country object's toString() method.