Question

Complete the code below by finishing up the tasks detailed in the comments.

ArrayList<String> fruits = new ArrayList<>();
Scanner sc = new Scanner(System.in);
String fruit = "?";
while (!fruit.isEmpty()) {
    
    // prompt the user to enter a fruit
    
    
    // read the fruit using "sc", saving it into variable "fruit"
    
    
    // convert the fruit entered to lowercase
    
    
    // if the fruit is NOT empty and it is a new fruit, add it to collections "fruits"
    
}

// display all fruits

Answer 1

Java Code

import java.util.*;  

class JavaExample {  

    public static void main(String args[]){  

        ArrayList<String> fruits = new ArrayList<>();

        Scanner sc = new Scanner(System.in);

        String fruit = "?";

        while (!fruit.isEmpty()) {

    

            // prompt the user to enter a fruit

            System.out.println("Enter a fruit: ");

        

            // read the fruit using "sc", saving it into variable "fruit"

            fruit = sc.nextLine();

        

            // convert the fruit entered to lowercase

            fruit = fruit.toLowerCase();

        

            // if the fruit is NOT empty and it is a new fruit, add it to collections "fruits"

            if(fruit!="" && fruits.indexOf(fruit)==-1){

                fruits.add(fruit);

            }

        }

        // display all fruits

        System.out.println(fruits);

       

   }  

}

Screenshot of the code

Screenshot of Output

Program Logic

• *The while loop runs until the user input, which is stored in the fruit variable, is not empty.
• *During each while loop, user input is asked and stored in the fruit variable.
• *The fruit name is then converted to lowercase.
• *Then the if loop checks whether

1) the user input isn't empty. If it's empty then it is not added to the list.

2) the indexof method returns -1 if a given item is not found in the list. This is used to find if the new fruit is unique or not. It is entered into the list only if it's unique.

• *Finally all the items in the list "fruits" is displayed.