Paren Matcher

Write a class, ParenMatcher, that checks for an expression for legal balancing of the paired delimiters (), [], {}, and < >. The class should contains a main method that accepts the expression as a command line argument and outputs whether the expression is balanced or, if not, an appropriate error message.

• The expression should be parsed using Scanner (constructed from the argument string), and thus all elements of the expression -- operands and delimiters -- may be assumed to be whitespace-separated
• Assume the exception class ParenCheckerException is available, and has a constructor that accepts a String (the message of the exception)

Here is a typical set of executions of the class:

$ java ParenChecker "( a )"
OK!
$ java ParenChecker "( a "
*** ERROR *** Missing closers '('
$ java ParenChecker "( a ]"
*** ERROR *** Mismatched '(' and ']'
$ java ParenChecker "( [ a "
*** ERROR *** Missing closers '[' '('
$ java ParenChecker "( [ a ] )"
OK!
$ java ParenChecker "( [ a ) ]"
*** ERROR *** Mismatched '[' and ')'