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In this article, we will learn to implement an editable JLabel in Java. An editable JLabel is a label component that can be converted to an editable text field when clicked. JLabel A JLabel class can extend the JComponent class, and an object of JLabel provides text instructions or information on a GUI. A JLabel can display a single line of read-only text, an image, or both text and image. Syntax The following is the syntax for JLabel initialization: JLabel label = new JLabel("Tutorials Point"); A JLabel can explicitly generate a PropertyChangeListener interface. Methods The important methods of a ... Read More
Quick sort algorithm is also known as partition exchange sort and is based on partitioning of an array of data into smaller sub-arrays. A large array is partitioned into two arrays such that the left sub-array holds values smaller than the pivot element and the right sub-array holds values greater than the pivot value. Quicksort partitions an array and then calls itself recursively twice to sort the two resulting sub-arrays: left and right sub-arrays. Quick sort falls uses the divide and conquer approach of problem-solving methodology. This algorithm is ... Read More
Shaker sort is a variation of bubble sort and is both a stable and comparison based sorting algorithm. The shaker sort is also known as cocktail sort or bidirectional bubble sort as it sorts the array in both directions. In this article, we have an unsorted array. Our task is to implement the shaker sort in C++ to sort the given array. Example The following example sorts the unsorted array using the shaker sort: Input: array = {5, 1, 4, 2, 8, 0, 2} Output: Sorted array = {0, 1, 2, 2, 4, 5, 8} The ... Read More
Stooge Sort is a recursive sorting algorithm used to sort the given data. The stooge sort divides the array into two overlapping parts, 2/3 each and then sort the array in three steps by sorting first then second and again first part. The worst case time complexity of this algorithm is O(n^2.7095). In this article, we have an unsorted array. Our task is to implement the stooge sort algorithm for sorting the given array in C++. Example Here is an example of sorting the given array using stooge sort: Input: array = {5, 3, 8, 4, 2, 7} ... Read More
While parsing a JSON String to or from a Java object, by default, Gson tries to create an instance of the Java class by calling the default constructor. In the case of Java, if a class doesn’t contain a default constructor or we want to do some initial configuration while creating Java objects, we need to create and register our own instance creator. Custom Instance Creator Using Gson Custom instance means creating a new instance that is not the default. In this instance, we can add whatever properties we want. There are many libraries that create custom instances. In this ... Read More
Deserializing a JSON to a Java object means converting a JSON string into a Java object.The deserialize() Method of the Flexjson Library We will be using the Flexjson library to deserialize a JSON to a Java object in Java. The Flexjson library is a lightweight library that is used for serializing as well as deserializing Java objects to and from JSON. A JSONDeserializer is the main class for performing deserialization of JSON to Java objects. We can deserialize a JSON string to a Java object using the deserialize(String json, Class type) method of JSONDeserializer. Syntax of deserialize() Method The syntax of the ... Read More
Pretty printing JSON is a process of formatting our JSON data to make it more readable and good-looking.The prettyPrint() Method of Flexjson We will be using the Flexjson library to pretty print JSON in Java. The Flexjson library is a lightweight library that is used for serializing as well as deserializing Java objects to and from JSON. A JSONSerializer is the main class for performing the serialization of Java objects to JSON and by default, performs a shallow serialization. We can pretty-print JSON using the prettyPrint(boolean prettyPrint) method of JSONSerializer class. Syntax of prettyPrint() The syntax of the prettyPrint() method ... Read More
The Jackson is a library for Java and it has very powerful data binding capabilities and it also provides a framework to serialize custom java objects to JSON and deserialize JSON back to Java object. Ignoring Null and Empty Fields Using Jackson The Jackson library provides @JsonInclude annotation, which controls the serialization of a class as a whole or its individual fields based on their values during serialization. The @JsonInclude annotation contains below two values: Include.NON_NULL: Indicates that only properties with not null values will be included in JSON. Include.NON_EMPTY: Indicates ... Read More
Sometimes, we may need to parse a JSON into a Gson tree model in Java. For example, we may need to parse a JSON string into a tree model when we want to manipulate the JSON data in a more easy way.The getAsJsonObject() Method The Gson library is used to parse a JSON String into a Tree Model. We will be using the JsonParser to parse the JSON string into a Tree Model of type JsonElement. We will be using the getAsJsonObject() method of JsonElement for getting the element as JsonObject, and the other is getAsJsonArray(), which is a method ... Read More
When we have a JSON object and want to change a specific field name for some reason, we can use the Jackson library in Java.The Jackson Annotation @JsonProperty The Jackson Annotation @JsonProperty is used on a property or method during the serialization or deserialization of JSON. It takes an optional 'name' parameter, which is useful in case the property name is different from the key name in JSON. By default, if the key name matches the property name, the value is mapped to the property value. If the key name is different, we can use the @JsonProperty annotation to ... Read More