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list.set() ... list.add AreThrowing Errors

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Here is the code I keep getting errors on when I uncommment the .set() and the .add() lines
// List Test
import java.util.*;
public class ListMaking {
public static void main(String args[]) {
List<String> listname = new ArrayList<String>();
System.out.println(listname.get(0) + " ");


The errors are

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.set(Unknown Source)
at ListMaking.main(ListMaking.java:7)

What is the issue here ?

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You can only use the "set(...)" method to replace an existing element. It will not add a new element.

The value you specify as the index must be >= 0 and < size.

NB: Size, is the number of elements in the list, not the capacity.

You cannot do this either:

ArrayList<String> list = new ArrayList<String>( 10 );

list.set(5, "Hello"); // Will throw an exception!

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