Java string capitalize testing

Posted on 2009-05-09
Medium Priority
Last Modified: 2012-05-06
Im inputting  a users name as 2 strings first name last name  and I want to test if the first letter of their first name and last name  is capitalize and only the first letter if not it needs to print an error message for the user to correct the problem.
Question by:humberss
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 92

Expert Comment

ID: 24343119
You can use the split() method to break up first and last name

String[] names = input.split(" ");

you can use the Character class and the String charAt() method to check

char c first = names[0].charAt(0);
if (Character.isLowerCase(first))
   // first character is lower case

do the same for the 2nd name


Expert Comment

ID: 24343231
It sounds to me like you are storing their first and last name seperately, so it would be more like this:

if( Character.isLowerCase(firstName.charAt(0)) )
       //Print error
      if( Character.isLowerCase( lastName.charAt(0) )
             //print error

Expert Comment

ID: 24343298
Some names have caps that aren't the first letter, but if you want to force it you could do the first bit of code.

If you just want to check use a Pattern and Match
        firstName = firstName.substring(0,1).toUpperCase() + firstName.substring(1).toLowerCase();
        Matcher m = Pattern.compile("^[A-Z]+[a-z]*$").matcher(firstName);

Open in new window


Accepted Solution

mohgupta earned 2000 total points
ID: 24382718
you can also try this
String firstname ="Abc";
String lastname = "Xyz";
char ch= firstname.charAt(0);
if(! Character.isUpperCase(ch)){
System.out.println("Please enter first letter of firstname in uppercase");
if(! Character.isUpperCase(ch)){
System.out.println("Please enter first letter of lastname in uppercase");

Open in new window


Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
How to fix incompatible JVM issue while installing Eclipse While installing Eclipse in windows, got one error like above and unable to proceed with the installation. This video describes how to successfully install Eclipse. How to solve incompa…
Suggested Courses
Course of the Month12 days, 12 hours left to enroll

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question