How To Convert Hostname To Ip Address Inwards Coffee - Inetaddress Example

Hello guys, today, I am going to learn y'all virtually i interesting flat from java.net package, the InetAddress. If y'all convey never used this flat before, permit me say y'all that it's an abstraction to stand upwardly for an Internet address as well as it encapsulates both hostname as well as IP address. Since converting an IP address to hostname or hostname to IP address is a rattling mutual requirement, Java developer should know virtually this class, and, inward full general virtually java.net package, which contains much other useful flat for networking as well as client-server applications. So, what is the best way to larn novel APIs similar java.net? Well, past times writing pocket-sized programs similar this, which has a pocket-sized focus as well as permit y'all explore things. They are super useful as well as that's how I convey learned the bulk of Java API.

In this example, I convey used main() method to execute the plan but if y'all desire y'all tin equally good start writing JUnit bear witness equally suggested inward Test Driven for exploring Regular Expression APIs similar Matcher as well as Pattern classes as well as methods like find(). If y'all haven't read that book, brand an seek to read this weekend, it's an awesome mass as well as y'all volition live on a meliorate Java developer later reading that book.

Anyway, coming dorsum to the trace of piece of job inward hand, y'all quest to write a Java plan to convert hostname to IP address inward Java. Though y'all tin hardcode the hostname for testing purpose, I convey made this plan to a greater extent than interactive, which agency y'all tin run this plan as well as acquire into the hostname from the ascendency prompt.

For Beginners, I recommend this approach because that interactiveness gives the feeling that something is running as well as working as well as it equally good allows y'all to bear witness past times giving random input as well as getting immediate feedback.

Though, for Intermediate programmers, I recommend writing JUnit tests alongside predefined input equally that's how professional person Java developer write code. Though, if y'all don't know much virtually JUnit, I propose y'all bring together a course of pedagogy like Learn Unit Testing alongside JUnit & Mockito inward thirty Steps on Udemy. That's volition equally good brand y'all a meliorate Java developer.

How to Convert Hostname to IP Address inward Java

Now that y'all know that y'all tin utilization InetAddress flat from java.net bundle to convert hostname to IP address, let's write our Java program. Apart from that bit, nosotros equally good quest to know how to acquire user input from the ascendency trace or console as well as how to impress values dorsum to console.

I am certain y'all know how to create that but if y'all don't permit me say y'all that y'all tin utilization the Scanner flat from java.util bundle to read the user input from the ascendency line. This flat equally good does a lot to a greater extent than than merely reading input, it tin equally good convert the input into the information type y'all want.

For example, if y'all acquire into "111" on a console than it tin read it equally a String or equally an Integer. In this case, nosotros don't quest to create anything especial equally hostnames are going to live on String as well as Scanner.nextLine() returns String.

Now, coming dorsum to printing the output into the console, y'all tin utilization manifestly onetime System.out.println() method, the commencement method I learned on Java. Btw, if y'all don't much virtually this basic concepts as well as thus I equally good propose y'all acquire through a comprehensive Java course of pedagogy similar The Complete Java MasterClass to larn them inward a structured way. It's equally good most up-to-date flat as well as updated for Java 12.

And, hither is our consummate Java plan to convert hostname to IP address, y'all tin run it either on the ascendency trace or on your favorite ides similar Eclipse, IntellJIDEA or NetBeans.

Java Program to convert hostname to IP Address

import java.net.InetAddress; import java.net.UnknownHostException; import java.util.Arrays; import java.util.Scanner;     /**  * Java plan to acquire IP address from hostname inward Java  *  * @author WINDOWS 8  *  */   public class HelloAndroid {       public static void main(String args[]) {           // Creating Scanner to read input from Console         Scanner console = new Scanner(System.in);             System.out.println("Please acquire into hostname to detect IP address");         String hostname = console.nextLine();             // Use static method getByName() to acquire InetAddress of host         InetAddress inet = null;           try {             inet = InetAddress.getByName(hostname);         } catch (UnknownHostException e) {             // TODO Auto-generated grab block             e.printStackTrace();           }             // Getting IP address from hostname inward Java         String IPAddress = inet.getHostAddress();           System.out.printf("IP address of host %s  is %s %n", hostname, IPAddress);       }   }   Output: Please acquire into the hostname to detect the IP address HP The IP address of host HP  is 192.168.1.4 

That's all virtually how to detect the IP address from hostname inward Java. This form of pocket-sized programs volition assistance y'all to larn as well as empathize JDK API better. As y'all convey learned closed to of the key classes from java.net bundle inward this plan similar InetAddress which contains both hostname as well as IP Address as well as abstraction to stand upwardly for an network address.

Further Reading
The Complete Java MasterClass
Java Fundamentals: Input/Output
Java Network Programming - fourth Edition
TCP/IP as well as Networking Fundamentals for information technology Pros

Thanks for reading this article thus far. If y'all similar this article as well as thus delight portion alongside your friends as well as colleagues. If y'all convey whatever resultant on agreement this plan or running it from the ascendency trace or Eclipse, delight drib a regime annotation as well as I'll seek my best to assistance you.

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