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>Can we change the contents of a final array as in the code snippet below?</p>
<b>

```java
    final int[] array = new int[5];
    array[0] = 1;
```
</b>
</div>
    <div class="ans">
        <p><span class="hi-yl-b">It may appear counterintuitive, but we can actually change the <i>contents</i> of the array even though it is marked as final.</span> The <code class="mthd">array</code> variable points to a particular start location in the memory where the contents of the array are placed. The location or the memory address can't be changed. For instance, the following code will not compile:</p>
<b>

```java
    final int[] array = new int[5];
    array = new int[10];
```
</b>
<p>However, the following code is perfectly legal and will work.</p>
<b>

```java
public class FinalArrayExample {

    final int[] array = new int[5];
    
    // Allowed 
    void changeArrayContents(int  i, int val) {
        array[i] = val;
    }

    // Not allowed and will not compile
    /*
    void changeArray(){
        array = new int[10];
    }*/
}

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

<div>
   # Question # 1
    <div>
        <p>Can we change the contents of a final array as in the code snippet below?</p>
<b>

```java
    final int[] array = new int[5];
    array[0] = 1;
```
</b>
</div>
    <div>
        <p><span>It may appear counterintuitive, but we can actually change the <i>contents</i> of the array even though it is marked as final.</span> The <code>array</code> variable points to a particular start location in the memory where the contents of the array are placed. The location or the memory address can't be changed. For instance, the following code will not compile:</p>
<b>

```java
    final int[] array = new int[5];
    array = new int[10];
```
</b>
<p>However, the following code is perfectly legal and will work.</p>
<b>

```java
public class FinalArrayExample {

    final int[] array = new int[5];
    
    // Allowed 
    void changeArrayContents(int  i, int val) {
        array[i] = val;
    }

    // Not allowed and will not compile
    /*
    void changeArray(){
        array = new int[10];
    }*/
}

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

This lesson discusses initialization of variables 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

Initialization

Question # 1