A button in my app should only get the text in 8 text fields and send it to a table IF all fields are filled in

Question

A button in my app gets all the text you enter in 8 text fields and sends it to a table. I need code so that you need to fill in ALL fields before you can send the info. How do

Answer 1

You can check, if a field is empty by getting the text length and comparing it to zero.

If you don't want to check every text field in one single if-statement, you could check them separately and return, if one field has an invalid value.

if (jTextField1.getText().length() == 0) 
{
    //Tell the user, that the first field has to be filled in.
    return;
}
if (jTextField2.getText().length() == 0) 
{
    //Tell the user, that the second field has to be filled in.
    return;
}
//...

Otherwise, you could check them all in one if-statement:

if (jTextField1.getText().length() != 0
    && jTextField2.getText().length() != 0
    && ...) 
{
    //Fill in the table
}
else
{
    //Tell the user, that the all fields have to be filled in.
}