개발이 하고 싶어요

동작은 하는데 에러처리등을 직접해줘야 하는데 .. 너무 정보가 부족하다

import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Stack;
import java.util.stream.Collectors;

public class Cable {

	public static int parse(String x) {
		int result = 0;
		if (x.equals("-")) {
			result = 1;
		} else if (x.equals("_")) {
			result = 2;
		} else {
			result = 3;
		}
		return result;
	}

	public static BigInteger solve(String cable) throws Exception {

		Stack<String> stack = new Stack<>();
		String[] cables = cable.split("");

		for (String c : cables) {

			if (c.equals(")")) {
				String temp = null;
				List<String> internal = new ArrayList<>();
				while (!(temp = stack.pop()).equals("(")) {
					internal.add(temp);
				}
				stack.addAll(internal);
				stack.addAll(internal);
			} else {
				stack.push(c);
			}
		}

		return BigInteger.valueOf(stack.stream().mapToInt(Cable::parse).sum());

	}

}

가장 추천을 많이 받은 풀이

import java.util.*;
import java.math.BigInteger;

class BracketException extends RuntimeException {}
class NodeException    extends RuntimeException {}

public class Cable {

    final private static BigInteger TWO = new BigInteger("2");

    public static BigInteger calculateLength(String cable){
        
        BigInteger tot = BigInteger.ZERO;
        int        lvl = 0,
                   f   = 0;
        
        for (char c: cable.toCharArray()) {
            f = 0;
            switch (c) {
                case '-':  f = 1;                                              break;
                case '_':  f = 2;                                              break;
                case '=':  f = 3;                                              break;
                case '(':  lvl += 1;                                           break; 
                case ')':  lvl -= 1; if (lvl<0) throw new BracketException();  break;
                default :  throw new NodeException();
            }
            if (f!=0) tot = tot.add( TWO.pow(lvl).multiply( BigInteger.valueOf(f) ));
        }
        if (lvl!=0) throw new BracketException();
        return tot;
    }

}