public class Parentheses private static final char L_PAREN = "C: private static final char R_PAREN = "); private static final char L_BRACE = 'C: private static final char R_BRACE = '}; private static final char L_BRACKET = '[; private static final char R_BRACKET = ')': public static boolean foo(Strings) { Stack stack = new Stack0; for (int i = 0; i