I've been tasked to do the below in a newbie Java tutorial on ArrayList
:
// 1) Declare am ArrayList of strings
// 2) Call the add method and add 10 random strings
// 3) Iterate through all the elements in the ArrayList
// 4) Remove the first and last element of the ArrayList
// 5) Iterate through all the elements in the ArrayList, again.
Below is my code:
import java.util.ArrayList;
import java.util.Random;
public class Ex1_BasicArrayList {
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<String>();
for (int i = 0; i <= 10; i++){
Random rand = new Random();
String randy = String.valueOf(rand);
list.add(randy );
}
for (int i = 0; i < list.size(); i++){
System.out.print(list.get(i));
}
list.remove(0);
list.remove(list.size());
for (int i = 0; i < list.size(); i++){
System.out.print(list.get(i));
}
}
}
The code runs, but I get the below error message when it runs. Any ideas on what I'm doing wrong?
java.util.Random@7852e922java.util.Random@4e25154fjava.util.Random@70dea4ejava.util.Random@5c647e05java.util.Random@33909752java.util.Random@55f96302java.util.Random@3d4eac69java.util.Random@42a57993java.util.Random@75b84c92java.util.Random@6bc7c054Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 10, Size: 10
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.remove(Unknown Source)
at apollo.exercises.ch08_collections.Ex1_BasicArrayList.main(Ex1_BasicArrayList.java:23)
List
indices go from 0
to list.size() - 1
. Exceeding the upper bound results in the IndexOutOfBoundsException
list.remove(list.size() - 1);