infosys java interview questions core java interview questions

sure! preparing for a java interview, especially with a company like infosys, requires a good grasp of core java concepts. below is a compilation of some key core java interview questions, along with explanations and code examples.

1. **what are the main features of java?**

java is known for its key features, including:

- **platform independence:** write once, run anywhere (wora) due to the java virtual machine (jvm).
- **object-oriented:** supports object-oriented programming principles like inheritance, encapsulation, and polymorphism.
- **automatic memory management:** java has a built-in garbage collector that automatically manages memory.
- **multithreading:** java supports concurrent execution of two or more threads.
- **rich standard library:** java has a comprehensive api for various functionalities.

2. **explain the concept of oop in java.**

java is an object-oriented programming language that uses the following principles:

- **class:** a blueprint for creating objects.
- **object:** an instance of a class.
- **inheritance:** mechanism to acquire properties and behaviors of another class.
- **encapsulation:** bundling the data (attributes) and methods (functions) that operate on the data into a single unit or class.
- **polymorphism:** ability to take many forms, typically achieved through method overloading and overriding.

example of oop concepts

```java
// base class
class animal {
void sound() {
}
}

// derived class
class dog extends animal {
void sound() {
}
}

public class main {
public static void main(string[] args) {
animal mydog = new dog(); // polymorphism
}
}
```

3. **what is the difference between `==` and `equals()` in java?**

- `==` compares the references (memory addresses) of two objects.
- `equals()` compares the actual content of the objects.

example

```ja ...

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