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>How can we pass multiple or variable number of arguments to a method on each invocation call?</p>
    </div>
    <div class="ans">
        <p>We can pass variable number of arguments to a method using varargs feature. Below is an example of passing multiple arguments of the same type to a method.</p>
## Varargs Example
<b>

```java
    public void childrenNames(String... names) {
        for (int i = 0; i < names.length; i++)
            System.out.println(names[i]);
    }
```
</b>
<p>
Note:
<ul>
<li><p>The type name is followed by three dots, a space, and then the variable name.</p></li>
<li><p>The varargs variable is treated like an array.</p></li>
<li><p>The varargs variable must appear at the last in the method signature.</p></li>
<li><p>As a consequence of the above, there can only be a single varargs in a method signature.</p></li>
</ul>
The above method can be invoked as follows:</p>
## Invoking Varargs Method
<b>

```java
        childrenNames();
        childrenNames("jane");        
        childrenNames("jane", "tom", "peter");
```
</b>

<p><span class="hi-yl-b">Varargs method can also be invoked without any arguments.</p>
</div>
</div>

<div>
   # Question # 1
    <div>
        <p>How can we pass multiple or variable number of arguments to a method on each invocation call?</p>
    </div>
    <div>
        <p>We can pass variable number of arguments to a method using varargs feature. Below is an example of passing multiple arguments of the same type to a method.</p>
## Varargs Example
<b>

```java
    public void childrenNames(String... names) {
        for (int i = 0; i < names.length; i++)
            System.out.println(names[i]);
    }
```
</b>
<p>
Note:
<ul>
<li><p>The type name is followed by three dots, a space, and then the variable name.</p></li>
<li><p>The varargs variable is treated like an array.</p></li>
<li><p>The varargs variable must appear at the last in the method signature.</p></li>
<li><p>As a consequence of the above, there can only be a single varargs in a method signature.</p></li>
</ul>
The above method can be invoked as follows:</p>
## Invoking Varargs Method
<b>

```java
        childrenNames();
        childrenNames("jane");        
        childrenNames("jane", "tom", "peter");
```
</b>

<p><span>Varargs method can also be invoked without any arguments.</p>
</div>
</div>

This lesson explains how variable number of arguments can be passed to methods.

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

Variable Argument Passing