Why ArrayDeque cannot be created for Sagov?

Suppose I create an ArrayDeque of characters:

ArrayDeque<char> pass_raw = new ArrayDeque<char>();

Or make the function receiving it:

static public void stackUpper(ArrayDeque<char> pass) {
 if (pass.getLast() == 'A') {
pass.addLast('B');
 } else {
pass.addLast('A');
}
 }

But it's not working! IntelliJ does not swear, but the compiler says expected reference (for what?) is Chara:

Main.java:5: error: unexpected type
 public static void stackUpper(ArrayDeque<char> pass) {
^
 required: reference
 found: char

Main.java:39: error: unexpected type
 ArrayDeque<char> pass_raw = new ArrayDeque<char>();
^
 required: reference
 found: char
Main.java:39: error: unexpected type
 ArrayDeque<char> pass_raw = new ArrayDeque<char>();
^
 required: reference
 found: char

What am I doing wrong?