Ява Чар
CharSequence seq = new StringBuilder(1).append(ch);
Helpless Hamster
CharSequence seq = new StringBuilder(1).append(ch);CharSequence seq = new StringBuilder(1).append(c);
String a = "abc";
String b = "anthony";
char c = a.charAt(0);
b.contains("" + c);
b.contains(String.valueOf(c));