Removing a character from an ArrayList of characters

问题

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?

回答1:

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'));

回答2:

You need to cast it to an object type to force the compiler to choose remove(Object) instead of remove(int):

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

回答3:

You can search through the list for where a happens to be.

chars.remove(chars.indexOf('a'));

来源：https://stackoverflow.com/questions/38861354/removing-a-character-from-an-arraylist-of-characters