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>What is the difference between <code class="intf">Iterator</code> and <code class="intf">Iterable</code> interfaces?</p>
    </div>
    <div class="ans">
        <p><span class="hi-yl">The <code class="intf">Iterator</code> interface is implemented by collection classes that intend to provide a uniform way of accessing their items sequentially.</span></p>
<b>

```java
public interface Iterator<E> {
    boolean hasNext();

    E next();

    void remove();
}
```
</b>
<p><span class="hi-yl-b">The <code class="intf">Iterable</code> interface on the other hand is implemented by classes that can be the target of the <code class="clazz">foreach</code> statement</span> or in other words can produce an iterator. <span class="hi-yl">The <code class="clazz">foreach</code> construct was introduced in Java 5 and allows for more concise code.</span> The interface definition is given below:</p>
<b>

```java
public interface Iterable<T> {

    Iterator<T> iterator();
}
```
</b>
</div>
</div>


<div>
   # Question # 1
    <div>
        <p>What is the difference between <code>Iterator</code> and <code>Iterable</code> interfaces?</p>
    </div>
    <div>
        <p><span>The <code>Iterator</code> interface is implemented by collection classes that intend to provide a uniform way of accessing their items sequentially.</span></p>
<b>

```java
public interface Iterator<E> {
    boolean hasNext();

    E next();

    void remove();
}
```
</b>
<p><span>The <code>Iterable</code> interface on the other hand is implemented by classes that can be the target of the <code>foreach</code> statement</span> or in other words can produce an iterator. <span>The <code>foreach</code> construct was introduced in Java 5 and allows for more concise code.</span> The interface definition is given below:</p>
<b>

```java
public interface Iterable<T> {

    Iterator<T> iterator();
}
```
</b>
</div>
</div>


This lesson introduces questions relating to iteration 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

Iterating in Java

Question # 1