Yar Yar - 3 months ago 11
Java Question

Removing a character from an ArrayList of characters

I am facing with this unwanted

char
to
int
conversion in a loop. Say I have this List of Characters and I want to remove one of those:

List<Character> chars = new ArrayList<>();
chars.add('a');
chars.add('b');
chars.add('c');
chars.remove('a'); // or chars.remove('a'-'0');


so
'a'
is interpreted as its
int
value and I'm getting an
IndexOutOfBoundsException
exception. Is there any easy workaround for this?

Answer

A char is promoted to an int, which takes precedence over autoboxing, so remove(int) is called instead of remove(Object) you may have intuitively expect.

You can force the "right" method to be called by boxing the argument yourself:

chars.remove(Character.valueOf('a'));
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