Mintoak Innovations Interview Questions and Answers

A constructor is a special method in Java used to initialize objects when they are created.

• Constructors have the same name as the class they belong to.

• They do not have a return type, not even void.

• Constructors can be overloaded, allowing multiple ways to initialize an object.

• Example: public class Dog { Dog() { } Dog(String name) { this.name = name; } }

• If no constructor is defined, Java provides a default construct...read more

You can sort a class object by implementing the Comparable interface and overriding the compareTo method.

• Implement the Comparable interface in the class and override the compareTo method to compare objects based on roll number.

• Use Collections.sort() method to sort the list of objects based on roll number.

• Example: class Student implements Comparable<Student> { public int compareTo(Student s) { return this.rol...read more

Spring Boot annotations simplify configuration and enhance functionality in Java applications, promoting ease of development.

• @SpringBootApplication: Combines @Configuration, @EnableAutoConfiguration, and @ComponentScan.

• @RestController: Combines @Controller and @ResponseBody for RESTful web services.

• @Autowired: Automatically injects dependencies, reducing boilerplate code.

• @RequestMapping: Maps HTTP requests to spec...read more

PostgreSQL and Oracle SQL differ in terms of licensing, features, performance, and cost.

• PostgreSQL is open-source while Oracle SQL is proprietary.

• PostgreSQL is known for its extensibility and support for advanced features like JSON data types, while Oracle SQL is known for its robustness and scalability.

• PostgreSQL is generally considered more cost-effective for small to medium-sized projects, while Oracle SQL is p...read more

Streams in Java are sequences of elements that support functional-style operations.

• Streams are used to process collections of objects in a functional way.

• They allow for concise and readable code by enabling operations like filter, map, reduce, etc.

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); Stream<String> stream = names.stream();