Extract numbers from a JFormattedTextField

Question

I have made a JFormattedTextField that is formatted to only take numbers:

Number num;
JFormattedTextField Length =  new JFormattedTextField(num);

Now I want to get the number out of that and multiply it by 23. I know you can do:

String LengthStr = Length.getText();
int LengthInt = Integer.parseInt(LengthStr);
int Total = LengthInt*23;

But Isn't there an easier way? I've tried:

int LengthInt = Length.getText();
int Total = LengthInt * 23;

because it should be a number already.

The above didn't work because it says

Required: int Found: String

What I 'm asking for is that if the JFormattedTextField is formatted to be an int, then surely I can do something like

int LengthInt = Length.getInt();
int Total = LengthInt *23;

Answer 1

No, you can't. The line: int LengthInt = Length.getText(); tries to put a String Object (Length.getText()) into an primitive tipe (int).

There is no implicit conversion from String to integer in Java, because a String can contain anything (like "abc", for example) that is not directly convertible to a number.

Also, the first two lines should be changed to this: JFormattedTextField Length = new JFormattedTextField(NumberFormat.getIntegerInstance()); Instantiate the JFormattedTextField with the NumberFormat instead of Number.