a StackOperations.java, with the following methods completed:

• public boolean balancedBrackets(String str);

• public void flipStack(Stack stk);

Problem (doThis=false) @Testcase (io="([]) => void", paramchanges="([])") @Testcase (io="([1]) -> void", paramchanges="([1])") @Testcase (io="([1,2])-> void", paramchanges="([2,1])") @Testcase (io="([1,2,3,4,5,6,7,8,9]) => void", paramchanges=" ([9,8,7,6,5,4,3,2,1])") public static void flipstack (Stack stk) { } Problem (doThis=false) @Test Case (io="([[[]]') -> true") @Test Case (io="( [][[]][[[]]') -> true") @Test Case (io=" ([[[[]]') -> false") @Test Case (io="( [[[]]') -> false") public static boolean balancedBrackets (String str) { return false; }