HashMapUtils.java

import java.util.HashMap;
import java.util.Map;
import java.math.BigInteger;

public class HashMapUtils {
    public static HashMap<Character, String> parseMap(String mapString) {
        String[] tokens = mapString.split(" ");
        HashMap<Character, String> map = new HashMap<>();

        for (int i = 0; i < tokens.length; i += 2) {
            char key = tokens[i].charAt(0);
            String value = tokens[i + 1];
            map.put(key, value);
        }

        return map;
    }

    public static String hashMapToLatexTable(HashMap<Character, String> hashMap) {
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("\\begin{center}\n\\begin{tabular}{ ");
        for (int i = 0; i < hashMap.size(); i++) {
            stringBuilder.append("c ");
        }
        stringBuilder.append("}\n");
        for (Character key : hashMap.keySet()) {
            stringBuilder.append(key).append(" = ").append(hashMap.get(key)).append(", ");
        }
        stringBuilder.append("\\\\\n\\end{tabular}\n\\end{center}\n");
        return stringBuilder.toString();
    }

    public static Character getKeyFromValue(HashMap<Character, String> hashMap, String value) {
        for (Map.Entry<Character, String> entry : hashMap.entrySet()) {
            if (entry.getValue().equals(value)) {
                return entry.getKey();
            }
        }
        return null;
    }
}