Java Developer's Important topic || core java||by Er prince kumar

Collection of important topic of java Developer

Java Developer topic of core java

OOPS concepts (Data Abstraction, Encapsulation, Inheritance, Polymorphism)
Basic Java constructs like loops and data types.
String handling.
Collection framework.
Multithreading.
Exception handling.
Generics.
Synchronisation.

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How to Send OTP in Mobile Number | login with OTP mobile Number | How to send OTP in mobile no with Spring Boot APP

😂 Login with Mobile Number OTP ---------------------------------------------------------------------------- If you want to develop a project to log in with OTP mobile Number in Spring Boot Applications then this post for you. In this post, I am going to use some other service to send the OTP in mobile number. we have to use it in this project spring boot. we are going to use Twilio to send SMS. we are going to use a web socket to send the data from the browser to the SMS gateway. Oracle Database for store the user details. <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> <version>2.3.3.RELEASE</version> </dependency> <dependency> <groupId>com.twilio.sdk</grou

Spring Boot With MySQL Database connection with Examples | MySQl Database Configuration with Spring Boot Projects

😃 MySQL Database Configuration with Spring Boot Projects In this article, we are going to introduce How to connect MySQL Database with the Spring Boot project. pom.xml <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</gro

How can we create Auto generated field or ID for mongodb using spring boot

😂 How can we create an Auto-generated field or ID for MongoDB using spring boot? First Create One Application Like Mongodb_sequence-id-generator Pom.XML <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-mongodb</artifactId> </dependency> <dependency> <groupId>de.flapdoodle.embed</groupId> <artifactId>de.flapdoodle.embed.mongo</artifactId> </dependency> User.java package com.app; import org.springframework.data.annotation.Id; import org.springframework.data.annotation.Transient; import org.springframework.data.mongodb.core.mapping.Document; @Document(collection = "users_db") public class User { @Transient public static final String SEQUENCE_NAME = &

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