How to get values from a Map with different value types? (Java)

Question

I have a utility function that returns Map, but that Map always has this structure:

{ \"a\": , \"b\"         


        

Answer 1

Ultimately, because your map has Object as its value type, you need to cast, but you can hide this with a typed utility method:

@SuppressWarnings("unchecked")
public static  T get(Map map, String key) {
    return (T)map.get(key);
}

So then due to java's type inference this will compile:

Type1 type1obj = get(data, "a");

Adding @SuppressWarnings("unchecked") stops your IDE/compiler complaining about an "unsafe cast".