Suppose I have a few variables:
public void foo() {
String name = "Bob";
String gender = "Male";
Integer age = 6;
String address = "some address";
}
How can I turn them into a Map<String, Object> like
Map<String, Object> map = new HashMap<>();
map.put("name", name);
map.put("gender", gender);
map.put("age", age);
map.put("address", address);
other than manually inserting them into the map. Can this be done using Reflection?
No, you have to manually put them into a map. It is not possible to use reflection to find the names or values of local variables.
Dont re invent the wheel use Json libraries and parse your objects
public class GenericTypeData {
private String name = "Bob";
private String gender = "Male";
private int age = 6;
private String address = "some address";
public GenericTypeData( ) {
this.name = "Bob";
this.gender = "Male";
this.age = 6;
this.address = "some address";
}
public static void main(String[] args) {
System.out.println(new Gson().ToJson(this, GenericTypeData.class));
}
}
you will get a json like
{
"name": "Bob",
"gender": "Male",
"age": 6,
"address": "some address",
}
If your variables are fixed for a class to convert into map then you can convert them into a json.
You can first prepare your object containing variables and then use toJson() method to convert it into the format as you specified in your question.
This link may help for usage of toJson() method from google gson library.
If you are interested in String, you can use the method ReflectionToStringBuilder.toString(Object, ToStringStyle) from Apache Commons Lang. Using JSON_STYLE.
name,genderetc are local variables, and reflection can't be used for local variables. If they were fields it would be different.