Remove an item from an arraylist

Question

How do I remove items from the arraylist I know have. I know about the remove() method, but it doesn't seem to work;

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

    System.out.print("Voer een naam in:");

    Scanner in = new Scanner (System.in);
    for (int i = 0; i<10; i++){
        namen.add(in.next());
        int aantalNamen = namen.size();
        System.out.println(namen);
        System.out.println(aantalNamen);
        if(i == 10){
            namen.remove(9);
        }
    }

How can I change this code to make it work?

Rahul · Accepted Answer · 2013-11-22 10:35:28Z

2

Because of the condition i < 10 in the for loop, the if in the for will never satisfy. The for will terminate once i becomes 10 and therefore, the condition if(i == 10){ will never be true. That's why nothing is getting removed from your list.

You either need to change the condition of the if to i==9 or change the condition in the for to i <= 10.

answered Nov 22, 2013 at 10:35

Rahul

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Comments

subash · Accepted Answer · 2013-11-22 10:37:25Z

0

if(i == 10){
        namen.remove(9);
}

this code not work inside the loop. because when i get 10 the loop will terminate. so you put remove code in outside the loop. like this

for (int i = 0; i<10; i++){
    namen.add(in.next());
    int aantalNamen = namen.size();
    System.out.println(namen);
    System.out.println(aantalNamen);
}
namen.remove(9);

answered Nov 22, 2013 at 10:37

subash

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2 Comments

Jhanvi Over a year ago

it can be removed inside the loop also, just value of i has to be incremented

subash Over a year ago

but loop contain i < 10

Masudul · Accepted Answer · 2013-11-22 10:38:20Z

0

How can I change this code to make it work?

To work, you need to compare i==9, at if statement.

  if(i == 9){
     namen.remove(9);
   }

answered Nov 22, 2013 at 10:38

Masudul

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