Checking to see if a JTextField is empty.

[Dark]

Ok I'm trying to check whether or not a JTextField is empty, mainly because I'm trying to make it so if you don't enter any information in the TextField it ignores it from my formula.

However after scouring google and anything I can think of in the API I have come up with nothing. I also tried

lower.getText() != ""

and

lower.getText() != null

Is there a way to check and see if anything is entered into a JTextField?

Edit: I'm an idiot. I just used .equals to solve that problem. I thought of that as soon as I hit post. :facepalm:

[masijade]

getText().trim().length() == 0
getText().trim().equals("")

use the equals method for String/Object equality

A Textfield will not return null, as the API docs state

[Fubarable]

// Number 3:
getText().trim().isEmpty();

[Dark]

getText() with an empty JTextField will return an empty string, so getText().equals(""); works. I got it to work and now my project is done.

Curious though, why are you suggesting trim()?

[camickr]

Curious though, why are you suggesting trim()?

It gets rid of leading/trailing spaces.

[JosAH]

getText() with an empty JTextField will return an empty string, so getText().equals(""); works. I got it to work and now my project is done.

Curious though, why are you suggesting trim()?

Because an idiotic user might've fallen asleep with his nose on the space bar and when he woke up he accidentally pressed enter ...

kind regards,

Jos

[Junky]

Jos speaks from experience.

[Dark]

Well my project accepts spaces as a legal character, so trimming it would limit the functionality. I see what you mean though, if I had a name field then trimming it would be a good idea.

[masijade]

// Number 3:
getText().trim().isEmpty();

Since 1.6, unfortunately, our project still uses 1.5

[JosAH]

Jos speaks from experience.

Am not! I never fall asleep in front of my keyboard; I always fall asleep (read: I do deep thinking there) on my old couch. I hate to sit in front of a computer; it's like sitting in front of a washing machine, that's stupid too.

kind regards,

Jos

[DarrylBurke]

If I must fall asleep at the keyboard, I prefer to rest my nose on the zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz zzzzzzzzzzzzzzzz

[Dark]

Is the z key more comfortable?

[JosAH]

Is the z key more comfortable?

No it's not; as a matter of fact typing with your nose is nearly impossible; example:

oim gtytopibgh thiosd wweigttth myuy nbioose

kind regards,

Jos (I wonder if I can type with my ... *beep* ;-)

[Dark]

Well I understood what you were trying to type, maybe with a little practice you'll become a pro.

[JosAH]

Well I understood what you were trying to type, maybe with a little practice you'll become a pro.

I prefer the piano over the keyboard ;-)

kind regards,

Jos

[DarrylBurke]

And really, Jos, any discussion about the weight of your caboose is OT here. Let's stick to the topic, shall weeeeeeeeeeeeeeeee

db

[JosAH]

And really, Jos, any discussion about the weight of your caboose is OT here. Let's stick to the topic, shall weeeeeeeeeeeeeeeee

There's nothing wrong with my caboose; as a matter of fact its weight is fine and I have the fundamental right to show it whereever and whenever I want; so there. I thought that the sub-title of this forum was "Java programmers and their cabooses" so I don't understand your remark about being off-topic either.

kindest regards,

Jos (and his caboose)