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">
   # Question # 1
    <div class="qtn">
        <p>Explain the <code class="intf">Externalizable</code> interface.</p>
    </div>
    <div class="ans">
        <p>The <code 
class="intf">Serializable</code> interface gets us automatic serialization capability for objects of our class. On the other hand the <code 
class="intf">Externalizable</code> interface provides a way to implement a custom serialization mechanism. A class that implements the <code class="intf">Externalizable</code> interface is responsible to save and restore the contents of its own instances.</p>

<p>The <code class="intf">Externalizable</code> interface extends the <code class="intf">Serializable</code> interface and provides two methods to serialize and deserialize an object, <code class="mthd">writeExternal()</code> and <code class="mthd">readExternal()</code>.</p>
</div>
</div>


<div>
   # Question # 1
    <div>
        <p>Explain the <code>Externalizable</code> interface.</p>
    </div>
    <div>
        <p>The <code >Serializable</code> interface gets us automatic serialization capability for objects of our class. On the other hand the <code >Externalizable</code> interface provides a way to implement a custom serialization mechanism. A class that implements the <code>Externalizable</code> interface is responsible to save and restore the contents of its own instances.</p>

<p>The <code>Externalizable</code> interface extends the <code>Serializable</code> interface and provides two methods to serialize and deserialize an object, <code>writeExternal()</code> and <code>readExternal()</code>.</p>
</div>
</div>


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

More on Serialization

Question # 1