CODEWITHSUNDEEP
java
user13120545
user13120545

Reputation:

Translate it in english

if(!(nameTextField.getText()).equals("")) {
  validationBoolean = true;
}
else {
  AlertDialog("Name","Customer Name","Please enter name");
  nameTextField.requestFocus();
  validationBoolean = false;
}

My teacher gave us this GUI project to do, I understood everything for the most part but this. I know "!" means "not" but I still don't get what this line of code is saying. I was wondering if someone can help me understand this loop.

Upvotes: -1

Views: 82

Answers (6)

Nishith Savla
Nishith Savla

Reputation: 327

The line if(!(nameTextField.getText()).equals("")) says: if the text of the nameTextField is not empty then do validationBoolean = true;
but if the text of the nameTextField is empty then create a alert dialog (which will ask for input).

Upvotes: 0

Sourav
Sourav

Reputation: 402

(nameTextField.getText()).equals("")

This will return true if your textview is empty. So

if(!(nameTextField.getText()).equals(""))

this whole line means it is checking if your textview is empty or not. If your textview is not empty, it will return a false and the "!" will turn it into true. So if your textview is not empty the if condition will be true and the code insde the if block will execute.

Upvotes: 0

Afridi Kayal
Afridi Kayal

Reputation: 2285

If the name text field's text is not empty (not equal to "") then set the validation boolean = true else, Show an alert dialog, set focus on the name text field and set validation boolean to false

Let's break the first line,

if(!(nameTextField.getText()).equals(""))

Firstly, get the text from nameTextField by using nameTextField.getText()
Secondly, Check if it is equal to "", i.e. check if the text is empty.
Finally, invert the condition using ! so that the if block gets executed when the text is not empty.

Upvotes: 2

Gabor Dicso
Gabor Dicso

Reputation: 33

It checks that the value entered in nameTextField is not empty and considers the value valid in this case. Note that any whitespace character passes this simple validation, that's why you usually call trim() beforehand. And FYI, this is not a loop, this is an if statement.

Upvotes: 0

Emon Hossain Munna
Emon Hossain Munna

Reputation: 755

if your nameTextField is empty then your validationBoolean will be assigned as true.

if nameTextField is not empty then a dialogue will occur with asking "Name", "Customer Name" and "Please enter name" and then the validationBoolean will be assigned as false.

Upvotes: 0

qiuyixianq
qiuyixianq

Reputation: 26

if(!(nameTextField.getText()).equals(""))

If text of the nameTextField is not blank ("") then it's valid. Else (if it's blank) it will prompt for Inputs

Upvotes: 1

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