Since not every Object is a String, you could call toString() on every value of the Map. But is this what you bean by "convert"? Now that we have Java 8/streams, we can add one more possible answer to the list: Assuming that each of the values actually are String objects, the cast to String should be safe.

When converting an Object into a Map, Jackson provides multiple approaches. Jackson is a versatile library renowned for its excellent support of various conversion types, such as JSON or XML. The following example shows how we can convert a Java object (employee) into a map using Jackson: ObjectMapper objectMapper = new ObjectMapper ();

Let’s consider another example where we utilize the Gson library to represent the Java object (employee) as a map handle in case of nested objects, such as the Address: Gson gson = new Gson (); String json = gson.toJson(employee);

The following test method uses reflection to convert a Java object (employee) into a Map, using the object’s field names as keys, and their values as values: Map<String, Object> map = convertUsingReflection(employee); Assert.assertEquals(employee.getName(), map.get("name")); Assert.assertEquals(employee.getAge(), map.get("salary"));