public class ExpressionOfBrackets {

    public String expression;

    public ExpressionOfBrackets(){

    }


    public static boolean expressionOfBrackets(String expression){
       Stack<Character> stack = new Stack<Character>();

        for(char chr : expression.toCharArray())
        {
            switch(chr) {
                case '(':
                    stack.push(chr);
                    break;
                case ')':
                    if(stack.isEmpty() || stack.pop() != '(')
                        return false;
                    break;
            }
        }
        return stack.isEmpty();
    }

}