10+ BlogVault Interview Questions and Answers

The class will have to provide its own implementation of the conflicting default method.

• When implementing multiple interfaces with the same default method, a class must provide its own implementation of the conflicting method.

• The class cannot inherit the default implementation from both interfaces.

• The class can choose to implement one of the default methods and provide its own implementation for the other.

• Alternatively, the class can provide a completely new implementation fo...read more

Data binding in Angular allows automatic synchronization of data between the model and the view.

• Interpolation: {{ }} - binds data from the component to the view

• Property binding: [] - binds data from the component to an element property

• Event binding: () - binds an event from the view to a method in the component

• Two-way binding: [()] - combines property and event binding to achieve two-way data flow

Inline templates are used for small, simple templates, while external templates are used for larger, complex templates.

• Inline templates are defined within the component's TypeScript file using the template property.

• External templates are defined in separate HTML files and linked to the component using the templateUrl property.

• Inline templates are useful for small components or when the template is simple and doesn't require much HTML code.

• External templates are beneficial for...read more

The two types of compiler in Angular are JIT (Just-in-Time) compiler and AOT (Ahead-of-Time) compiler.

• JIT compiler compiles the code at runtime in the browser.

• AOT compiler compiles the code before the application is deployed to the browser.

• JIT compilation is slower but allows for faster development and debugging.

• AOT compilation is faster but requires additional build step before deployment.

HttpClient module is used for http calls in Angular.

• HttpClient module is part of the @angular/common/http package.

• It provides a simplified API for making HTTP requests.

• It supports various HTTP methods like GET, POST, PUT, DELETE, etc.

• It also supports features like request/response headers, query parameters, error handling, etc.

• Example: import { HttpClient } from '@angular/common/http';

Projections in Spring Data JPA allow customizing the shape of the data returned from a query.

• Projections are used to retrieve specific fields or a subset of fields from an entity.

• They help in reducing the amount of data transferred over the network.

• Projections can be defined using interfaces or classes.

• They can be used with both JPQL and native SQL queries.

• Projections can be used to fetch related entities as well.

Terminal operations in streams produce a result or a side effect, while intermediate operations transform or filter the data.

• Terminal operations are the final operations in a stream pipeline, such as forEach, collect, or reduce.

• Intermediate operations are operations that can be chained together, such as filter, map, or sorted.

• Terminal operations trigger the processing of the stream and produce a result or a side effect.

• Intermediate operations transform or filter the data in t...read more

Custom implementation of ArrayList in Java

• Create a class with an array to store elements

• Implement methods like add, get, remove, size, etc.

• Handle resizing of the array when needed

• Example: CustomArrayList list = new CustomArrayList<>();

try vs try-with-resources

• The 'try' statement is used to define a block of code to be tested for exceptions.

• The 'try-with-resources' statement is used to automatically close resources that implement the AutoCloseable interface.

• Try-with-resources is more concise and less error-prone compared to try-catch-finally.

• Try-with-resources can handle multiple resources in a single statement.

Iterator is a universal interface for iterating over a collection, while ListIterator is a specialized interface for iterating over lists.

• Iterator can only move forward, while ListIterator can move in both directions.

• ListIterator has additional methods like previous(), hasPrevious(), and add().

• ListIterator is only available for List implementations, while Iterator can be used with any collection.

Promises are used for asynchronous programming in JavaScript, while Observables are used for reactive programming.

• Promises represent a single value that may be available now or in the future.

• Observables represent a stream of values that can be emitted over time.

• Promises are eager, meaning they start executing as soon as they are created.

• Observables are lazy, meaning they only start executing when subscribed to.

• Promises can be chained using .then() to handle success or failure...read more