Thread: How to put a default int, float, ect. for a JTextField ?

Hello every one.

Will I'm tying in my code to set a default number for the JTextField that when the user decide not to put any numbers. Like let say that I want the textfield set to 0 , so then the user do not file it it won't make any problem to the program because its already has a default number.

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if (stringGQ != null && stringGW != null && stringGP != null){
 
stringGQ = gMQ.getText();
stringGW = gMW.getText();
stringGP = gMP.getText();
 
weightPrice_1M = Double.parseDouble(stringGW) * Double.parseDouble(stringGP);		 
total_GroundM += weightPrice_1M  * Integer.parseInt(stringGQ);
 
finalTotal += total_GroundM;
 
  }
 
else{
 
 gMQ.getText().valueOf(0);
 gMW.getText().valueOf(0);
gMP.getText().valueOf(0);						   				  					  
 
 
}

Note: This is a small part of my code. when I leave it empty it take the 0 as a value, However,
when I write in text field it also take the value of a 0 and the finalTotal is also = to 0

So could please someone what I'm doing wrong.

Thank you in front