The ultimate guide to Java interviews with 300+ real-world questions and answers. Get interview-ready in just a few hours with strategies developed by FAANG engineers.

It’s very common to have interviews testing your knowledge of a programming language you claim to be an expert in.

If you've got an interview coming up on Java soon and need to get up to speed, this is the ideal course for you. You'll refresh your memory on everything from the basics to more advanced functionality you’re likely to be asked about. Even if you're using Java every day, you may not have been exposed to parts of it in some time, so it's always useful to make sure you're updated.

This course features more than 300 of the most commonly asked core Java interview questions that you're likely to face as an experienced software engineer. You'll get to explore questions by topic, as well as see detailed answers for each one, and plenty of live code examples where relevant. Get started today.

The Java Interview Handbook: 300+ Interview Questions

<div class="card">
   <h4>Question # 1</h4>
    <div class="qtn">
        <p>What is a final class?</p>
    </div>
    <div class="ans">
        <p>A class marked final can't be extended or inherited from. The <code class="clazz">String</code> class is one such example. <span class="hi-yl-b">You may want to make a class final if it is not designed for inheritance or you want to forbid any changes by subclassing.</span></p>
<h5 class="code-hd">Example  of final class</h5>
<b>

```java
final class DontExtendMe {

}

// Compile time error
class WontCompile extends DontExtendMe {

}
```
</b>
</div>

<div class="card">
   # Question # 1
    <div class="qtn">
        <p>What is a final class?</p>
    </div>
    <div class="ans">
        <p>A class marked final can't be extended or inherited from. The <code class="clazz">String</code> class is one such example. <span class="hi-yl-b">You may want to make a class final if it is not designed for inheritance or you want to forbid any changes by subclassing.</span></p>
## Example  of final class
<b>

```java
final class DontExtendMe {

}

// Compile time error
class WontCompile extends DontExtendMe {

}
```
</b>
</div>

<div>
   # Question # 1
    <div>
        <p>What is a final class?</p>
    </div>
    <div>
        <p>A class marked final can't be extended or inherited from. The <code>String</code> class is one such example. <span>You may want to make a class final if it is not designed for inheritance or you want to forbid any changes by subclassing.</span></p>
## Example  of final class
<b>

```java
final class DontExtendMe {

}

// Compile time error
class WontCompile extends DontExtendMe {

}
```
</b>
</div>

This lesson introduces the concept of a final class in Java.

Java Ecosystem

Methods

Classes

Interfaces

Inheritance

Lambda Expressions

Generics

Multi-Threading

Memory Management

Collections

Exceptions

Reflection

Serialization

Miscellaneous Topics

Java in Practice

Patterns

The End

Final Class

Question # 1