How would I make a condition in this code

Here's the code of my program..

Code:

---

double sam  ;
        try{
         
                  sam = Double.parseDouble(
                    this.insam.getText());
           
           
        } catch(Exception e){
            JOptionPane.showMessageDialog(this, "Re-enter Sample Size of Col A",
                    "Invalid Input", JOptionPane.ERROR_MESSAGE);
            return;
        }

---

Now, I want to make an exception that is if "sam" is less than 30, an Error Message will come out... But more than 30 the value is accepted. I tried some condition, but It doesn't work... Please check it below

Code:

---

if (sam > 30){
   
                    sam = Double.parseDouble(this.insam.getText());
         
          }else{
              JOptionPane.showMessageDialog(this, "Re-enter Sample Size of Col A", "Invalid Input",
                      JOptionPane.ERROR_MESSAGE);
              return;
          }

---

thanks for your help...

Your problem is that you are only parsing the data if sam is 30, but you haven't initialized sam yet.

Code:

---

try{
  parse sam
  if(condition)

  end if
  else

  end else

---

did you tried this?

Code:

---

double sam  ;
        try{
         
      if (sam > 30){
   
                    sam = Double.parseDouble(this.insam.getText());
         
          }else{
              JOptionPane.showMessageDialog(this, "Re-enter Sample Size of Col A", "Invalid Input",
                      JOptionPane.ERROR_MESSAGE);
           
          }
           
           
        } catch(Exception e){
            JOptionPane.showMessageDialog(this, "Re-enter Sample Size of Col A",
                    "Invalid Input", JOptionPane.ERROR_MESSAGE);
            return;
        }

---

Oh thanks sunde887, I forgot to put it on the code, I've initialized it also, but haven't tried your code...

UJJAL DHAR, thank you but I have tried that code already, it works, but the problem is even if greater than or less than, the error message will always pop out...

Are you sure that error message isn't coming from the exception?
You do, after all, have exactly the same error showing up, and no way to determine if it's due to an exception or simply down to sam being < 30.

@Tolls:
Yes, there's an error coming from exception, that is if I enter a character not a number or simply living it blank, error will come out. But I want it also to come out when sam is less than 30.

I love you sunde887... It works now...! Thanks to all of you who help me on this code.... Thank you very much....

I was just about to post and clarify what I meant a bit. I'm glad to have helped. Please mark your thread solved with the thread tools at the top if you are done.

Ok, Thank you again...