CODEWITHSUNDEEP
javainputjava.util.scanner
Kalec
Kalec

Reputation: 2881

How can I handle new line character using java-util-scanner in this situation?

I have a simple homework assignment, I'm making a simple UI (not GUI) and I'm using scanner for input.

I want to read 3 strings (Name, address, social security number)

If the user however does not insert anything simply presses enter, my code breaks. Instead of the 3 strings I need, I get more strings and they miss match.

Scanner input = new Scanner(System.in);
if (input.hasNext()) {
    name = input.nextLine(); 
} 
Scanner input = new Scanner(System.in);
if (input.hasNext()) {
    address = input.nextLine(); 
} 
Scanner input = new Scanner(System.in);
if (input.hasNext()) {
    ssnumb = input.nextLine(); 
}

So if user presses enter, creates a new line character, the input spills. How can I either avoid this or eliminate empty lines ?

Example:

enter

Nick

Mars

some number

I would have:

Name:

Address: Nick

Social Security Number: Mars

Upvotes: 0

Views: 10384

Answers (2)

Evgeniy Dorofeev
Evgeniy Dorofeev

Reputation: 136012

Try 

Scanner input = new Scanner(System.in);
String name = "";
while(name.trim().isEmpty()) {
    name = input.next();
}

Upvotes: 1

PermGenError
PermGenError

Reputation: 46408

Something like this:

Scanner input = new Scanner(System.in);
while(!input.next().isEmpty()) { // only when you enter literal string 
//do your scanner stuff here
}

Upvotes: 1

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