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

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   # Question # 1
    <div class="qtn">
        <p>What is Java SE?</p>
    </div>
    <div class="ans">
        <p><span class="hi-yl">The <i>SE</i> stands for standard edition.</span> We know that the Java platform is a suite of programs that facilitate developing and running programs written in the Java programming language. All Java platforms consist of a Java Virtual Machine (JVM) and an application programming interface (API). <span class="hi-yl">Don't confuse the Java programming language with the Java platform. The programming language is <i>one</i> part of the Java platform.</span> Since Java is independent of the underlying OS and hardware, there exist different versions of the platform that target specific devices and use-cases.</p>
<p>A Java platform edition is defined by a specification that describes APIs and their interactions. For instance, the Java SE edition specifications can be seen <a href="https://docs.oracle.com/javase/specs/" target="_blank">here</a>. Any vendor is free to implement the specification. For instance, there's one called <a href="https://www.azul.com/zulu-enterprise-landing/">Zulu</a>, which is Java SE 11 compliant. Similarly, Oracle has their own implementation that can be downloaded from <a href="https://www.oracle.com/technetwork/java/javase/downloads/index.html" target="_blank">here</a>.
<p>As a developer or a user, you'll be required to download either a JRE or JDK belonging to the edition you intend to use. <span class="hi-yl">The Java Standard Edition contains the basic Java APIs for standalone desktop and command line applications and can be used on desktop PCs, servers, and similar devices.</span></p>
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</div>

<div>
   # Question # 1
    <div>
        <p>What is Java SE?</p>
    </div>
    <div>
        <p><span>The <i>SE</i> stands for standard edition.</span> We know that the Java platform is a suite of programs that facilitate developing and running programs written in the Java programming language. All Java platforms consist of a Java Virtual Machine (JVM) and an application programming interface (API). <span>Don't confuse the Java programming language with the Java platform. The programming language is <i>one</i> part of the Java platform.</span> Since Java is independent of the underlying OS and hardware, there exist different versions of the platform that target specific devices and use-cases.</p>
<p>A Java platform edition is defined by a specification that describes APIs and their interactions. For instance, the Java SE edition specifications can be seen <a href="https://docs.oracle.com/javase/specs/" target="_blank">here</a>. Any vendor is free to implement the specification. For instance, there's one called <a href="https://www.azul.com/zulu-enterprise-landing/">Zulu</a>, which is Java SE 11 compliant. Similarly, Oracle has their own implementation that can be downloaded from <a href="https://www.oracle.com/technetwork/java/javase/downloads/index.html" target="_blank">here</a>.
<p>As a developer or a user, you'll be required to download either a JRE or JDK belonging to the edition you intend to use. <span>The Java Standard Edition contains the basic Java APIs for standalone desktop and command line applications and can be used on desktop PCs, servers, and similar devices.</span></p>
</div>
</div>

This lesson describes the various platform editions of Java. It also touches upon the community and processes around the Java ecosystem.

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

Java Flavors & Processes

Question # 1