cgi java interview questions core java interview questions

certainly! below is a comprehensive tutorial on common core java interview questions with code examples, as well as some cgi (common gateway interface) related interview questions.

core java interview questions

1. **what is java?**
- java is a high-level, object-oriented programming language designed to have as few implementation dependencies as possible. it is widely used for building platform-independent web applications, mobile applications, and enterprise software.

2. **explain the concept of oop in java.**
- object-oriented programming (oop) is a programming paradigm that uses "objects" to design applications. the main concepts of oop in java are:
- **encapsulation:** bundling data with methods that operate on that data.
- **inheritance:** mechanism where one class can inherit fields and methods from another.
- **polymorphism:** ability to present the same interface for different data types.
- **abstraction:** hiding complex implementation details and showing only the essential features.

**code example:**
```java
class animal {
void sound() {
}
}

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

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

3. **what are the different access modifiers in java?**
- java has four access modifiers:
- **public:** the member is accessible from any other class.
- **protected:** the member is accessible within its own package and by subclasses.
- **default (no modifier):** the member is accessible only within its own package.
- **private:** the member is accessible only within its own class.

**code example:**
```java
class example {
public int publicvar;
protected int protectedvar;
...

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