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Articles on Trending Technologies
Technical articles with clear explanations and examples
C++ Program for class interval arithmetic mean
We are given with three arrays where first array contains the upper limit for arithmetic mean, second array contains the lower limit for arithmetic mean and third array contains the frequencies and the task is to generate the arithmetic mean of class intervals given.What is Arithmetic Mean?Arithmetic mean is the average value that is calculated by dividing the sum of all the elements in the set with the total number of elements in the given set.How to calculate Class Interval Arithmetic MeanGiven with Lower Limit, Upper Limit, FrequencyLower LimitUpper LimitFrequency121342563784Calculate the mid-point by adding the upper limit and lower limit ...
Read MoreC++ Program for triangular pattern (mirror image around 0)
Given with the positive value n and the task is to generate the triangular pattern i.e. mirror image of the printed numbers and display the resultExampleInput-: n = 6 Output-:Input-: n = 3 Output-:Approach used in the below program is as follows −Input the value of n as a positive integerTraverse one loop i for the number of rows in a pattern i.e. nTraverse one loop j for the number of spaces in a patternTraverse another loop for the digits in a patternAlgorithmSTART Step 1-> declare function to print mirror image of triangular pattern void print_mirror(int n) declare ...
Read MoreC++ program for Find sum of odd factors of a number
Given with a positive integer and the task is to generate the odd factors of a number and finding out the sum of given odd factors.ExampleInput-: number = 20 Output-: sum of odd factors is: 6 Input-: number = 18 Output-: sum of odd factors is: 13So, result = 1 + 5 = 6Approach used in the below program is as follows −Input the number for calculating the sum of odd factors of that numberIgnore the digit 0 and 2 because both are even digits and store the digit 1 because it is an odd digitStart the loop from 3 ...
Read MoreWhat to use @SerializedName annotation using Gson in Java?
The @SerializedName annotation can be used to serialize a field with a different name instead of an actual field name. We can provide the expected serialized name as an annotation attribute, Gson can make sure to read or write a field with the provided name.Syntax@Retention(value=RUNTIME) @Target(value={FIELD, METHOD}) public @interface SerializedNameExampleimport com.google.gson.*; import com.google.gson.annotations.*; public class SerializedNameTest { public static void main(String args[]) { Gson gson = new GsonBuilder().setPrettyPrinting().create(); Person person = new Person(115, "Raja Ramesh", "Hyderabad"); String jsonStr = ...
Read MoreHow to implement custom JsonAdapter using Gson in Java?
The @JsonAdapter annotation can be used at field or class level to specify the Gson. The TypeAdapter class can be used to convert Java objects to and from JSON. By default, Gson library converts application classes to JSON by using built-in type adapters but we can override it by providing custom type adapters.Syntax@Retention(value=RUNTIME) @Target(value={TYPE, FIELD}) public @interface JsonAdapterExampleimport java.io.IOException; import com.google.gson.Gson; import com.google.gson.TypeAdapter; import com.google.gson.annotations.JsonAdapter; import com.google.gson.stream.JsonReader; import com.google.gson.stream.JsonWriter; public class JsonAdapterTest { public static void main(String[] args) { Gson gson = new Gson(); System.out.println(gson.toJson(new ...
Read MoreHow to convert JsonNode to ArrayNode using Jackson API in Java?
A JsonNode is a base class for all JSON nodes that forms the JSON Tree Model whereas ArrayNode is a node class that represents an array mapped from JSON content. We can convert or translate JsonNode to ArrayNode by typecasting the ArrayNode to retrieve the values using the readTree() method of ObjectMapper class and get() method for accessing the value of a specified element of an array node.Syntaxpublic JsonNode readTree(String content) throws IOException, com.fasterxml.jackson.core.JsonProcessingExceptionExampleimport com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.node.ArrayNode; import com.fasterxml.jackson.core.JsonProcessingException; public class JSonNodeToArrayNodeTest { public static void main(String args[]) throws JsonProcessingException { ...
Read MoreHow to search a value inside a JSON file using Jackson in Java?
The com.fasterxml.jackson.databind.node.ObjectNode class can be used to map the JSON object structure in Json content. We can search for a particular value inside the JSON file using the get() method of ObjectNode class, this method used for accessing the value of a specified field of an object node.Syntaxpublic JsonNode get(String fieldName)Exampleimport com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ObjectNode; public class ObjectNodeTest { public static void main(String args[]) throws Exception { String jsonString = "{"Id":101, "name":"Raja Ramesh", "address":"Madhapur"}"; ObjectMapper mapper = new ObjectMapper(); ObjectNode ...
Read MoreUsing Variables in JShell of Java 9
In JShell 9, variables can be declared during a session. Once the user has logged into the session, they can declare a variable as follows −jshell> int val = 56 ;Italics indicate the terminal, once the user has logged in to their session.The above line would print the below output. The semicolon in the above line is optional, and it will run fine without the semicolon also.Outputval = = > 56When an integer value is defined by assigning it to a variable name on the JShell, and it is executed, by pressing ‘Enter’ key, it is displayed on the next ...
Read MoreHow to lay out Views in RelativeLayout programmatically in Android?
This example demonstrates how to lay out Views in RelativeLayout programmatically in Android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javapackage com.app.sample; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.RelativeLayout.LayoutParams; import android.widget.Toast; public class MainActivity extends Activity { RelativeLayout relativelayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ...
Read MoreHow to implement custom deserializer using @JsonDeserialize annotation in Java?
The @JsonDeserialize annotation is used to declare custom deserializer while deserializing JSON to Java object. We can implement a custom deserializer by extending the StdDeserializer class with a generic type Employee and need to override the deserialize() method of StdDeserializer class.Syntax@Target(value={ANNOTATION_TYPE, METHOD, FIELD, TYPE, PARAMETER}) @Retention(value=RUNTIME) public @interface JsonDeserializeIn the below program, we can implement a custom deserializer using @JsonDeserialize annotationExampleimport java.io.*; import com.fasterxml.jackson.core.*; import com.fasterxml.jackson.databind.*; import com.fasterxml.jackson.databind.annotation.*; import com.fasterxml.jackson.databind.deser.std.*; public class JsonDeSerializeAnnotationTest { public static void main (String[] args) throws JsonProcessingException, IOException { Employee emp = new Employee(115, "Adithya"); ...
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