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To construct a Java object from a dynamic JSON using deserialization, follow the steps below:

1. Create a class that matches the structure of the JSON. Every field in the class will correspond to a key-value pair in the JSON.
2. Use a JSON library such as Jackson, Gson, or JSON.simple to deserialize the JSON into an object of the class.
3. To deserialize the JSON, use the following code:

ObjectMapper mapper = new ObjectMapper();
MyClass obj = mapper.readValue(jsonString, MyClass.class);

In the above code, jsonString is the JSON string to be deserialized and MyClass is the class that corresponds to the JSON structure.

1. The above code will throw an exception if the JSON structure does not match the class structure. To handle such situations, you can use the @JsonIgnoreProperties annotation on the class to ignore unknown properties in the JSON. Alternatively, you can use a JsonParseException to catch any exceptions thrown during deserialization.

Overall, deserialization is a useful way to convert JSON into Java objects and can be used for many use cases where dynamic data is involved.