Java_OOP_Concepts_Cheat_Sheet-Aug23-2022

 

Javafaker API - Generate Real-Time Fake Data - Using Faker Class

 

Generate Random Data in Java using  Java Faker Class

it is providing functionality to generate fake or dummy data.

It is a library that can be used to generate a wide array of real-looking data from a mobile number, addresses, names to popular culture references. This is really helpful when we want to use some placeholder but don't have actual data. Like you want to generate credit card data and want to do validation against that. Faker library will help you to generate that.

In the microservices-based development, we need data to do against validation, and generate the dummy test data is quite a challenging task. In this article, we will be looking at how to resolve this using Faker

add below dependency,

Maven:

<dependency><groupId>com.github.javafaker</groupId><artifactId>javafaker</artifactId><version>1.0.2</version></dependency>

Gradle

compile group: 'com.github.javafaker', name: 'javafaker', version: '1.0.2'

Just make fun and start using random data, just create below

Faker feku = new Faker();

If you want to generate with different locales:

Faker faker = new Faker(new Locale("YOUR_LOCALE")); 
//e.g en-US
Faker feku = new Faker(new Locale("en-US"));

This library provides you access to more than 35 different domains and provides data nearly to every real-life use case. The domains like below

• Finance
• Food
• Books
• Name
• Address
• Business
• ChuckNorris
• HarryPotter
• LordOfTheRings

Check all the list of available domain and locale it supports:

https://github.com/DiUS/java-faker

Example:

package utilities;

import java.nio.charset.Charset;

import java.util.Random;

import com.github.javafaker.Faker;

public class GenerateFakeTestData {

private String email;

private String firstname;

private String lastname;

private String password;

private String companyName;

public String getCompanyName() {

return companyName;

}

public void setCompanyName(String companyName) {

this.companyName = companyName;

}

Faker fkobj=new Faker();

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

public String getFirstname() {

return firstname;

}

public void setFirstname(String firstname) {

this.firstname = firstname;

}

public String getLastname() {

return lastname;

}

public void setLastname(String lastname) {

this.lastname = lastname;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public static String getAlphaNumericString(int n) {

// length is bounded by 256 Character

byte[] array = new byte[256];

new Random().nextBytes(array);

String randomString = new String(array, Charset.forName("UTF-8"));

// Create a StringBuffer to store the result

StringBuffer r = new StringBuffer();

// Append first 20 alphanumeric characters

// from the generated random String into the result

for (int k = 0; k < randomString.length(); k++) {

char ch = randomString.charAt(k);

if (((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9')) && (n > 0)) {

r.append(ch);

n--;

}

}

// return the resultant string

return r.toString();

}

}

-----------------------------------------------

Usage of FAKER class

package utilities;

import java.util.Locale;

import com.github.javafaker.Faker;

import com.github.javafaker.service.FakeValuesService;

import com.github.javafaker.service.RandomService;

public class ConsumeTestData {

public static void main(String[] args) {

//Create Object for Faker class

Faker fkobj=new Faker();

GenerateFakeTestData tdobj=new GenerateFakeTestData();

String firstName=fkobj.address().firstName();

tdobj.setFirstname(firstName);

System.out.println("firstname is:"+tdobj.getFirstname());

//generate last name

String lastName=fkobj.address().lastName();

tdobj.setLastname(lastName);

System.out.println("lastname is:"+tdobj.getLastname());

String email=fkobj.internet().emailAddress();

tdobj.setEmail(email);

System.out.println("email address is:"+tdobj.getEmail());

String company=fkobj.company().name();

tdobj.setCompanyName(company);

System.out.println("company name is:"+tdobj.getCompanyName());

tdobj.setPassword(tdobj.getAlphaNumericString(10));

System.out.println("random password:"+tdobj.getPassword());

System.out.println("*****************************************");

System.out.println("Generate the testdata with indian locale");

// Create an object of Faker class with default locale i.e ENG

Faker fkobj1 = new Faker(new Locale("en-IND"));

// To generate valid random first name

System.out.println("First name is: "+fkobj1.name().firstName());

// To generate valid random last name

System.out.println("Last name is: "+fkobj1.name().lastName());

// To generate valid random city name

System.out.println("City name is: "+fkobj1.address().cityName());

// To generate valid random state name

System.out.println("State name is: "+fkobj1.address().state());

// To generate valid random country name

System.out.println("Country name is: "+fkobj1.address().country());

// To generate valid random cell number

System.out.println("Cell number is: "+fkobj1.phoneNumber().cellPhone());

// To generate valid random animal name

System.out.println("Animal name is: "+fkobj1.animal().name());

}

}