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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to send a SMS using SMSmanager in Dual SIM mobile in Android?
This example demonstrates how do I send 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.javaimport androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import android.Manifest; import android.content.pm.PackageManager; import android.os.Bundle; import android.telephony.SmsManager; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity { Button btnSend; EditText editTextNum, editTextMsg; private static final ...
Read MoreHow to control serialization through @JSON annotation using flexjson in Java?
The @JSON annotation is used by JSONSerializer class to exclude or include a field during the serialization process. We can use the serialize() method of JSONSerializer class to perform a shallow serialization of the target instance.Syntax@Retention(value=RUNTIME) @Target(value={FIELD, TYPE, METHOD}) public @interface JSONExampleimport flexjson.JSONSerializer; import flexjson.JSON; public class JSONAnnotationTest { public static void main(String[] args) { JSONSerializer serializer = new JSONSerializer().prettyPrint(true); Employee emp = new Employee("Raja", "Ramesh", 30, "Hyderabad"); String jsonStr = serializer.serialize(emp); System.out.println(jsonStr); ...
Read MoreBakhshali Approximation for computing square roots in C program
Bakhshali approximation is a method of computing the square root of a number which is not a perfect square. Now, lets brush-related terms to easily understand the concept.Square root of a number x is a number that satisfies the following condition, y2 = x.Perfect Square is a number whose square roots are w. For example 16 is perfect square as its roots are 4 and 4.There are multiple methods defined mathematically to find the square root of a number. In this tutorial, we are going to learn about Bakhshali approximation to find the square root of a number.It is a ...
Read MoreBalance pans using given weights that are powers of a number in C++ program
STATEMENT − Balance pans using given weights that are powers of a number.DESCRIPTION − In this problem we are given a pan based weighing machine. we are given a weight T and some other weights whose values are powers of a number a. We need to balance the pans using the given weights.Now, based on this we have this equation, T + (some power of a) = (some other power of a)Now, we should remember that there is exactly one weight corresponding to a power value.Example, T = 12 : a = 4Using the below values, we can balance the ...
Read MoreC++ Balanced expression with replacement
A balanced expression of parentheses is an expression that contains pairs of all sort of parentheses together in a correct order.this means that for every opening parentheses there is a closing parentheses in proper order of parentheses i.e. { }.let's take a few examples to understand the concept better −Expression − {([][]{})({}[]{})}Output − balancedExplanation − we can see that for every opening parentheses there is a closing parentheses. all the parentheses lying between an opening parentheses and closing parentheses in Pairs.Output − not balanceExplanation − there are some unordered pairs of parentheses which makes the the expression unbalanced.In this problem ...
Read MoreHow to implement custom serializer using @JsonSerialize annotation in Java?
The @JsonSerialize annotation is used to declare custom serializer during the serialization of a field. We can implement a custom serializer by extending the StdSeralizer class. and need to override the serialize() method of StdSerializer class.Syntax@Target(value={ANNOTATION_TYPE, METHOD, FIELD, TYPE, PARAMETER}) @Retention(value=RUNTIME) public @interface JsonSerializeIn the below program, we can implement a custom serializer using @JsonSerialize annotationExampleimport java.io.*; import com.fasterxml.jackson.core.*; import com.fasterxml.jackson.databind.*; import com.fasterxml.jackson.databind.annotation.*; import com.fasterxml.jackson.databind.ser.std.*; public class JsonSerializeAnnotationTest { public static void main (String[] args) throws JsonProcessingException, IOException { Employee emp = new Employee(115, "Adithya", new String[] {"Java", "Python", "Scala"}); ...
Read MoreHow to convert a JSON string to a bean using JSON-lib API in Java?
The JSON-lib API is a java library to serialize and de-serialize java beans, maps, arrays, and collections in the JSON format. We need to convert a JSON string to a bean by converting a string to JSON object first then convert this to a java bean.Syntaxpublic static Object toBean(JSONObject jsonObject, Class beanClass)In the below program, we can convert a JSON string to a bean.Exampleimport net.sf.json.JSONObject; import net.sf.json.JSONSerializer; public class ConvertJSONStringToBeanTest { public static void main(String[] args) { String jsonStr = "{"firstName": "Adithya", "lastName": "Sai", "age": 30, "technology": "Java"}"; ...
Read MoreHow can we use @Since annotation using Gson in Java?
The @Since annotation can use with the setVersion() method of the GsonBuilder class. This annotation can apply to a field in java class and accepts float as an argument. This argument represents the version number in which the field has serialized. The same can apply to the deserialization process.Syntax@Documented @Retention(value=RUNTIME) @Target(value={FIELD, TYPE}) public @interface SinceExampleimport com.google.gson.annotations.Since; import com.google.gson.Gson; import com.google.gson.GsonBuilder; public class GsonSinceAnnotationTest { public static void main(String[] args) { Employee emp = new Employee(); emp.setEmployeeName("Raja Ramesh"); emp.setEmployeeId(125); ...
Read MoreHow to combine duplicate values into one with corresponding value separated by hyphens in MySQL?
To combine, use GROUP_CONCAT() function to combine some attributes in two rows into one. As a separator, use hyphens.Let us first create a table −mysql> create table DemoTable1386 -> ( -> Title varchar(255), -> Name varchar(60) -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1386 values('Introduction to MySQL', 'Paul DuBois'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1386 values('Java in Depth', 'Khalid Mughal'); Query OK, 1 row affected (0.48 sec) mysql> insert into DemoTable1386 values('Introduction to MySQL', 'Russell Dyer'); Query OK, ...
Read MoreImplement numbering in MySQL GROUP_CONCAT
Let us first create a table −mysql> create table DemoTable1627 -> ( -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command.mysql> insert into DemoTable1627 values('John', 'Smith'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1627 values('John', 'Doe'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1627 values('Adam', 'Smith'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1627 values('Carol', 'Taylor'); Query OK, 1 row affected (0.08 sec)Display all records from the table using ...
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