MBAData Science & AnalyticsDoctorate Software & Tech AI | ML MarketingManagement
Professional Certificate Programme in HR Management and AnalyticsPost Graduate Certificate in Product ManagementExecutive Post Graduate Program in Healthcare ManagementExecutive PG Programme in Human Resource ManagementMBA in International Finance (integrated with ACCA, UK)Global Master Certificate in Integrated Supply Chain ManagementAdvanced General Management ProgramManagement EssentialsLeadership and Management in New Age BusinessProduct Management Online Certificate ProgramStrategic Human Resources Leadership Cornell Certificate ProgramHuman Resources Management Certificate Program for Indian ExecutivesGlobal Professional Certificate in Effective Leadership and ManagementCSM® Certification TrainingCSPO® Certification TrainingLeading SAFe® 5.1 Training (SAFe® Agilist Certification)SAFe® 5.1 POPM CertificationSAFe® 5.1 Scrum Master Certification (SSM)Implementing SAFe® 5.1 with SPC CertificationSAFe® 5 Release Train Engineer (RTE) CertificationPMP® Certification TrainingPRINCE2® Foundation and Practitioner Certification
Job Linked
Study Abroad
Master of Business Administration (90 ECTS)Master of Business Administration (60 ECTS)Master in Computer Science (120 ECTS)Master in International Management (120 ECTS)Bachelor of Business Administration (180 ECTS)B.Sc. Computer Science (180 ECTS)MS in Data AnalyticsMS in Project ManagementMS in Information TechnologyMasters Degree in Data Analytics and VisualizationMasters Degree in Artificial IntelligenceMBS in Entrepreneurship and MarketingMSc in Data AnalyticsMS in Data AnalyticsMaster of Science in AccountancyMS in Computer ScienceMaster of Science in Business AnalyticsMaster of Business Administration MS in Data ScienceMS in Information TechnologyMaster of Business AdministrationMS in Applied Data ScienceMaster of Business AdministrationMS in Data AnalyticsM.Sc. Data Science (60 ECTS)Master of Business AdministrationMS in Information Technology and Administrative Management MS in Computer Science Master of Business Administration MBA General Management-90 ECTSMSc International Business ManagementMS Data Science MBA Business Technologies MBA Leading Business Transformation Master of Business Administration MSc Business Intelligence and Data ScienceMS Data Analytics MS in Management Information SystemsMSc International Business and ManagementMS Engineering ManagementMS in Machine Learning EngineeringMS in Engineering ManagementMSc Data EngineeringMSc Artificial Intelligence EngineeringMPS in InformaticsMPS in Applied Machine IntelligenceMS in Project ManagementMPS in AnalyticsMS in Project ManagementMS in Organizational LeadershipMPS in Analytics - NEU CanadaMBA with specializationMPS in Informatics - NEU Canada Master in Business AdministrationMS in Digital Marketing and MediaMS in Project ManagementMaster in Logistics and Supply Chain ManagementMSc Sustainable Tourism and Event ManagementMSc in Circular Economy and Sustainable InnovationMSc in Impact Finance and Fintech ManagementMS Computer ScienceMS in Applied StatisticsMS in Computer Information SystemsMBA in Technology, Innovation and EntrepreneurshipMSc Data Science with Work PlacementMSc Global Business Management with Work Placement MBA with Work PlacementMS in Robotics and Autonomous SystemsMS in Civil EngineeringMS in Internet of ThingsMSc International Logistics and Supply Chain ManagementMBA- Business InformaticsMSc International ManagementMS Computer Science with AIML ConcentrationMBA in Strategic Data Driven ManagementMaster of Business AdministrationMSc Digital MarketingMBA Business and MarketingMaster of Business AdministrationMSc Digital MarketingMSc in Sustainable Luxury and Creative IndustriesMSc in Sustainable Global Supply Chain ManagementMSc in International Corporate FinanceMSc Digital Business Analytics MSc in International HospitalityMSc Luxury and Innovation ManagementMaster of Business Administration-International Business ManagementMS in Computer EngineeringMS in Industrial and Systems EngineeringMSc International Business ManagementMaster in ManagementMSc MarketingMSc Business ManagementMSc Global Supply Chain ManagementMS in Information Systems and Technology with Business Intelligence and Analytics ConcentrationMSc Corporate FinanceMSc Data Analytics for BusinessMaster of Business AdministrationMaster of Business Administration 60 ECTSMaster of Business Administration 90 ECTSMaster of Business Administration 60 ECTSMaster of Business Administration 90 ECTSBachelors in International Management
For College Students

Writing to file in Java - How to Write Full Guide


You already learnt how to read from a file. You will now learn how to write the output of your code to a file.


You can download the code used in the video from below: 


Video Transcript


You learned how to read from a file in the earlier examples. Now, what if you want to write to files? Let's say your boss may ask you to read some analytics data from a database, aggregate the data and write it on a spreadsheet. Now you can do this manually, or you can do it more efficiently using your knowledge of programming. For this, you use a feature called File Writer. You also need Try and Catch to catch exceptions that this code may throw in here, you first use Try and Catch for handling any exceptions. Let's create a writer that belongs to the class File Writer. This is used to communicate and write the results in a file. You use Write equals to True to start the writer. Next you take an input from the user and with the help of scan next line, you store it in a string line. Next you write this line in your output file using dot write function. At the end you close the Writer. As a good practice, let's run this code and I'm going to type Mary Had a little Lamp. Now let's go to the file and see if this is what was written in the file. I have my output file and as you can see, Mary Had a Little Lamp was written in my output file which was mentioned in my code here. Now let's print the first thousand prime numbers in a file. The code writes a prime number to the file as soon as it identifies one. First, we are going to create our Writer instance, which will help us write the prime numbers in our output prime text. Next, we write the logic for finding out the prime numbers between two 2000. Once we found the prime number, instead of printing out on the console, we instead write it to our output file. At the end, we simply close the Writer. Let's run this code first. Now let's try and see if output prime text actually has all the prime numbers between two to 1000. So when I open my output prime file, let me zoom in. You can see all the prime numbers from two to thousand have been printed in my output file. In this session you learned about functions. You use some internal functions in Java to save your time. You also learned about exceptions and how to handle them in a code. By now you know how to use conditional statements and loops to implement your logic. And you also know how to use a function to make your task easier.


Video Recap



  • File Writer feature in programming can help efficiently write to files

  • Try and Catch can handle exceptions thrown in the code

  • Creating a Writer instance can write results to a file using the write function

  • Input from users can be stored in a string and written to an output file

  • Good practice is to run the code to ensure it works

  • Logic for finding prime numbers can be written to an output file instead of printing to console

  • Functions, conditional statements, and loops can be used to implement logic

  • Handling exceptions in code is important

  • Using a function can make tasks easier.


In this lecture, you learnt how to write your output to a file. This will make sure that you have your results in a saved format for comparison or in situations when you need to present the output of your code to your clients.