BalancedBraces.java

public class BalancedBraces {
    public static void main(String[] args) {
        Stack<Character> stack = new Stack<Character>();
        final char Lparen = '(';
        final char Rparen = ')';
        final char Lbrace = '{';
        final char Rbrace = '}';
        final char Lbracket = '[';
        final char Rbracket = ']';
        boolean isBalanced = true;
        String string = StdIn.readString();
        for (int i = 0; i < string.length(); i++) {
            Character c = string.charAt(i);
            if (c.equals(Lparen) || c.equals(Lbrace) || c.equals(Lbracket)) stack.push(c);
            else if (c.equals(Rparen)) {
                if (stack.isEmpty() || (!stack.pop().equals(Lparen))) {
                    isBalanced = false;
                    break;
                }
            }
            else if (c.equals(Rbrace)) {
                if (stack.isEmpty() || (!stack.pop().equals(Lbrace))) {
                    isBalanced = false;
                    break;
                }
            }
            else if (c.equals(Rbracket)) {
                if (stack.isEmpty() || (!stack.pop().equals(Lbracket))) {
                    isBalanced = false;
                    break;
                }
            }
        }
        System.out.println(isBalanced);
    }
}