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Gson is a JSON for Java, which is developed by Google. We can format a date using the Gson library in Java. The Gson library provides a GsonBuilder class that allows us to create a Gson instance with custom settings. We call the create() method of the GsonBuilder class to create an instance of the Gson class. Then we use the method setDateFormat() to configure Gson to serialize Date objects according to the pattern provided. In order to use the Gson library, we need to add it to our project. If you are using Maven, add this to your ... Read More
In Java, an IllegalArgumentException is thrown in order to indicate that a method has been passed an illegal argument. An illegal argument is one that does not meet the required input from user. This exception extends the RuntimeException class and thus, belongs to those exceptions that can be thrown during the operation of the Java Virtual Machine (JVM). It is an unchecked exception and thus, it does not need to be declared in a method's or a constructor's throws clause. Reasons for java.lang.IllegalArgumentException Some of the reasons for IllegalArgumentException in Java is as follows: ... Read More
In Python, scoping rules define where you can access or modify a variable in your code. It is important to understand these rules because using a variable in the wrong place can cause errors or unexpected results. Python follows a specific order to find a variable, called the LEGB rule. This rule looks for variables in the following order - Local: First inside the function. Enclosing: Then, in any enclosing function. Global: Then, in the global scope. Built-in: Finally, in Python's built-in names. What is the LEGB Rule? The LEGB rule tells Python how to search for variable ... Read More
Pretty Printing JSON using "org.json" Library Pretty printing something means formatting it in a way that is easy to read, understand, and also looks good. Here we will format JSON data in a good-looking as well as readable way. We will be using the org.json library to pretty print JSON data in Java. The method toString(int indentFactor) of the JSONObject class is used to pretty print JSON data. The indentFactor parameter specifies the number of spaces to add for each level of indentation. To use the org.json library, we need to add it to our project. If you are using ... Read More
If you have ever worked with JSON in Java, you might have used classes like JSONObject, JSONArray, JsonParser, etc. These classes are part of the org.json library. We use these classes to build JSON or parse JSON. But behind the scenes, these classes use a class called JSONTokener. In this article, we will learn about the JSONTokener class and its importance in Java. What is JSONTokener? The JSONTokener class is like a tool that reads a JSON string step by step, breaking it into smaller parts called tokens. It is like a helper that makes it easier to understand and ... Read More
Custom JSON serialization Custom JSON Serialization means defining how your Java objects should be converted to JSON format. This is useful when you want to control the JSON output, such as changing field names, excluding certain fields, or formatting the data in a specific way. In this tutorial, we will create a custom serializer for a Java object using the Gson library. We will define a class Person with fields for name and age, and then create a custom serializer to control how this object is converted to JSON. To use Gson library, we need to add the Gson library ... Read More
Xml is a markup language that is used to store or transport data. It uses tags to define the data. There are libraries also available for converting XML to JSON. Those are: org.json Jackson Gson Let's learn how to convert XML to JSON using various libraries. Converting XML to JSON using org.json For converting XML to JSON, we will use the org.json library. It is a simple library that is used for converting XML to JSON and vice versa. We can use the XML.toJSONObject() method to ... Read More
Let's learn how to write a JSON string to a file using the Gson library in Java. If you are not familiar with JSON, you can refer to JSON Overview. Gson is a library that can be used to convert Java Objects to a JSON representation. To know more about Gson, refer to the Gson tutorial. GsonBuilder Class The primary class to use is Gson, which we can create by calling the new Gson(), and the GsonBuilder class can be used to create a Gson instance. We can write a JSON string to a file using the toJson() method of ... Read More
Deserialization is the process of converting JSON data back into Java objects. Gson provides a simple way to do this using the fromJson() method. Custom JSON de-serialization with Gson Gson is a Java library developed by Google to convert Java objects into their JSON format and vice versa. Custom JSON is a way we can modify or extend the standard JSON format so that it can suit our specific needs. To use the Gson library, we need to add the Gson library to our project. If you are using Maven, add this to your pom.xml file: com.google.code.gson gson 2.8.9 ... Read More
The given task is to list all the files from a specific directory, recursively, which means we need to retrieve all the files in the main directory and all the subdirectories as well. For example, if we have a directory structure like below - MyDirectory / \ / ... Read More