DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Over 2 million developers have joined DZone.
Log In / Join
  • Refcardz
  • Trend Reports
  • Webinars
  • Zones
  • |
    • Agile
    • AI
    • Big Data
    • Cloud
    • Database
    • DevOps
    • Integration
    • IoT
    • Java
    • Microservices
    • Open Source
    • Performance
    • Security
    • Web Dev
DZone >

Scanner Class: Exception Handling For Reading Integers

Isaque Alves user avatar by
Isaque Alves
·
Sep. 30, 09 · · Code Snippet
Like (0)
Save
Tweet
5.14K Views

Join the DZone community and get the full member experience.

Join For Free
This method prevents a common user error: input chars where have to input numbers.
Basically, it uses recursion and some other inner properties of the class Scanner, like the method nextline().
It Receives a input stream as argument.

public int readOnlyIntegers(Scanner in) 
    {

        int integer = 0;
            try
                {
                    integer = in.nextInt();
                }
                catch(Exception e)
                {
                    System.out.printf("only numbers are allowed");
                    in.nextLine();
                    integer = readOnlyIntegers(in);
                }
        return integer;
    }

Opinions expressed by DZone contributors are their own.

Popular on DZone

  • Password Authentication: How to Correctly Do It
  • How to Submit a Post to DZone
  • Autowiring in Spring
  • Which JVM Version Is the Fastest?

Comments

Partner Resources

X

ABOUT US

  • About DZone
  • Send feedback
  • Careers
  • Sitemap

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • MVB Program
  • Become a Contributor
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 600 Park Offices Drive
  • Suite 300
  • Durham, NC 27709
  • support@dzone.com
  • +1 (919) 678-0300

Let's be friends:

DZone.com is powered by 

AnswerHub logo