handling json files in java gson library part 6

handling json files in java using gson - part 6: advanced json manipulation

in this part of the tutorial, we will explore advanced features of the gson library, including:

1. **custom serialization and deserialization**
2. **handling nested objects**
3. **using type tokens**
4. **working with json arrays**

1. custom serialization and deserialization

sometimes, the default serialization and deserialization provided by gson may not fit your needs. in such cases, you can create custom serializers and deserializers.

**example: creating a custom serializer**

let's say we have a `user` class with a `dateofbirth` field that we want to format in a specific way during serialization.

```java

class user {
string name;
date dateofbirth;

public user(string name, date dateofbirth) {
}
}

class userserializer implements jsonserializeruser {
@override
public jsonelement serialize(user user, type typeofsrc, jsonserializationcontext context) {
jsonobject jsonobject = new jsonobject();
simpledateformat dateformat = new simpledateformat("yyyy-mm-dd");
return jsonobject;
}
}
```

**example: creating a custom deserializer**

to deserialize the same `user` object, we can create a custom deserializer:

```java
class userdeserializer implements jsondeserializeruser {
@override
public user deserialize(jsonelement json, type typeoft, jsondeserializationcontext context) throws jsonparseexception {

try {
...

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