What is the principle of converting json string to java object

1. Gson converts json objects into java objects through reflection

Example:

import com.google.gson.Gson;

public class JsonFormat {

//将json字符串转换为java对象

public void jsonToJava(String json_str, Object obj){

Gson gson = new Gson();

obj = gson.fromJson(json_str, obj.getClass());

}
}

2.Generation of gson

Through new gson(): all default configurations are used

Through JsonBuilder: customize some configuration options, version support, output , customized serialization, deserialization and constructors, etc.

Builder pattern: A type of designer pattern that separates the construction of a complex object from its representation.

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