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convert json string to json object in java

try {
     JSONObject jsonObject = new JSONObject("{"phonetype":"N95","cat":"WP"}");
}catch (JSONException err){
     Log.d("Error", err.toString());
}
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string to json java

JsonObject jsonObject = JsonParser.parseString(jsonString).getAsJsonObject();
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convert java object to json

User u = new User();
u.firstName = "Sample";
u.lastName = "User";
u.email = "sampleU@example.com";

ObjectMapper mapper = new ObjectMapper();
    
try {
    // convert user object to json string and return it 
    return mapper.writeValueAsString(u);
}
catch (JsonGenerationException | JsonMappingException  e) {
    // catch various errors
    e.printStackTrace();
}
Comment

convert java object to json

public class Student {
	
	Integer id;
	Map<String,Integer> marks;
	List<Address> addresses;
	
	public Student(Integer id, Map<String, Integer> marks, List<Address> addresses) {
		this.id = id;
		this.marks = marks;
		this.addresses = addresses;
	}
}

class Address {
	
	String addrType;
	Integer houseNo;
	String streetName;
	String countryName;
	House house;
	
	public Address(String addrType, Integer houseNo, String streetName, String countryName, House house) {
		this.addrType = addrType;
		this.houseNo = houseNo;
		this.streetName = streetName;
		this.countryName = countryName;
		this.house = house;
	}	
}

class House {
	
	Integer noOfRooms;
	String houseType;
	Integer noOfWindows;
	
	public House(Integer noOfRooms, String houseType, Integer noOfWindows) {
		this.noOfRooms = noOfRooms;
		this.houseType = houseType;
		this.noOfWindows = noOfWindows;
	}
}
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