Java

Use Stack class to match balanced parentheses and brackets. Create a class, with a method:

public static boolean matchParentheses(String s); It takes a String containing (, ), [, and ] and returns true if the parentheses are balanced.

For example: Matcher.matchParentheses("()") // returns true

Matcher.matchParentheses("([])") // returns true

Matcher.matchParentheses("([])[()]") // returns true

Matcher.matchParentheses("([)]") // returns false

Matcher.matchParentheses("(") // returns false

Matcher.matchParentheses("[]]") // returns false

I suggest implementing this by using Stack, pushing a ( or [ onto the stack whenever one of those characters is seen, and popping it off when the corresponding closing character is seen. If the wrong character is at the top of the stack, the parentheses do not match, and the method should return false. Note that Stack class can hold Character objects, but not char values, since char is a primitive type.