Neogeoinfo Technologies Interview Questions, Process, and Tips

To connect to a database with Java and update data, use JDBC API.

• Load the JDBC driver

• Establish a connection to the database using DriverManager.getConnection()

• Create a Statement object using the connection.createStatement() method

• Execute the SQL query using the Statement.executeUpdate() method

• Close the connection and statement objects

Annotations used in Spring Boot applications

• @SpringBootApplication - main annotation to enable Spring Boot features

• @RestController - to define RESTful web services

• @Autowired - to inject dependencies

• @GetMapping, @PostMapping, @PutMapping, @DeleteMapping - to map HTTP requests to methods

• @PathVariable - to extract values from the URI

• @RequestBody - to bind the request body to a Java object

• @ResponseStatus - to set th...read more

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• They consist of two coils of wire wrapped around a magnetic core.

• The primary coil is connected to the input voltage source, while the secondary coil is connected to the output load.

• Step-u...read more

A transistor is a semiconductor device used to amplify or switch electronic signals and power.

• Transistors are used in electronic devices such as radios, televisions, and computers.

• They can be either NPN or PNP type.

• Transistors have three terminals: emitter, base, and collector.

• They can be used as amplifiers to increase the strength of a signal or as switches to turn a signal on or off.

• Transistors are the building block...read more