Find correct brackets

Solution.java

import java.util.EmptyStackException;
import java.util.Map;
import java.util.Stack;

public class Solution {

    public static void main(String[] args) {
        System.out.println(isCorrectBrackets("[{}]"));
        System.out.println(isCorrectBrackets("[{]}"));
        System.out.println(isCorrectBrackets("[{}{}{}{}]"));
        System.out.println(isCorrectBrackets("}}"));
    }

    static boolean isCorrectBrackets(String str) {
        Stack<Character> stack = new Stack<>();
        Map<Character, Character> mappings = Map.of(
                ']', '[',
                '}', '{');

        for (char bracket : str.toCharArray()) {
            Character openBracket = mappings.get(bracket);
            if (openBracket == null) {
                stack.push(bracket);
            } else {
                char previousBracket;
                try {
                    previousBracket = stack.pop();
                } catch (EmptyStackException e) {
                    return false;
                }
                if (previousBracket != openBracket) {
                    return false;
                }
            }
        }
        return true;
    }
}