如何根据key过滤map返回的数据

import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

public class MapFilterExample {
    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<>();
        map.put("apple", 1);
        map.put("banana", 2);
        map.put("cherry", 3);

        String keyToFilter = "banana";
        Map<String, Integer> filteredMap = map.entrySet().stream()
            .filter(entry -> entry.getKey().equals(keyToFilter))
            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));

        System.out.println(filteredMap); // 输出: {banana=2}
    }
}

map_data = {
    "apple": 1,
    "banana": 2,
    "cherry": 3
}

key_to_filter = "banana"
filtered_map = {key: value for key, value in map_data.items() if key == key_to_filter}

print(filtered_map)  # 输出: {'banana': 2}

const mapData = {
    apple: 1,
    banana: 2,
    cherry: 3
};

const keyToFilter = "banana";
const filteredMap = Object.fromEntries(
    Object.entries(mapData).filter(([key, value]) => key === keyToFilter)
);

console.log(filteredMap);  // 输出: { banana: 2 }