asking for user String input without spaces in java

Question

I need the program to return a message if the user input a string with blank spaces. for example "this is my house" is not allowed, "thisismyhouse" is allowed. right now I use this code to check for blank spaces

    for(int i = 0; i < blabla.length(); i++) {
        if (blabla.charAt(i) == ' ')
            flag++;
        }
    }
    if (flag != 0) {
        System.out.println("input must not contain spaces");
    }

I wonder if there's a built in function like 'blabla.equals' etc for this purpose? or a better way to write this?

how about using String.contains ?

Scary Wombat
– Scary Wombat

2014-06-09 08:37:21 +00:00
Commented Jun 9, 2014 at 8:37 — Scary Wombat
– Scary Wombat, Commented Jun 9, 2014 at 8:37
blablabla.contains(" ")

rpax
– rpax

2014-06-09 08:38:35 +00:00
Commented Jun 9, 2014 at 8:38 — rpax
– rpax, Commented Jun 9, 2014 at 8:38

Abdul Fatir · Accepted Answer · 2014-06-09 08:40:15Z

1

Solution 1:

if(input.contains(" "))
   System.out.println("input must not contain spaces");

Solution 2:

if(input.indexOf(" ")>=0)
   System.out.println("input must not contain spaces");

Solution 3:

You can simply allow the user to enter spaces and remove them yourselves instead:

 input = input.replaceAll(" ","");

answered Jun 9, 2014 at 8:40

Abdul Fatir

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Comments

Scary Wombat · Accepted Answer · 2014-06-09 08:39:08Z

0

try

   if (blabla != null && blabla.contains (" ")) {
      System.out.println("input must not contain spaces");
      return;
   }

answered Jun 9, 2014 at 8:39

Scary Wombat

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Comments

Viktor Mellgren · Accepted Answer · 2014-06-09 08:39:55Z

0

this should do the trick.

if(blabla.contains(" ")){};

http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#contains(java.lang.CharSequence)

answered Jun 9, 2014 at 8:39

Viktor Mellgren

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Comments

Sedat Kestepe · Accepted Answer · 2014-06-09 08:49:25Z

0

A little search would give you the answer but... There is a method defined in String that returns a boolean value for that purpose already.

if (blabla.contains(" ")) {
System.out.println("input must not contain spaces");
}

You can review the methods of String...

answered Jun 9, 2014 at 8:49

Sedat Kestepe

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