Change if (str ==“”) to if (str.isEmpty())Don’t use == to compare strings. The empty string from the text field is a different entity than the constant pool empty string. You are doing an identity comparison. ScottOn Aug 3, 2024, at 10:17 PM, Pieter van den Hombergh wrote:an empty string is neve
an empty string is never a valid number. for a valid number you need at
least one digit inside the string.
met vriendelijke groet
Pieter van den Hombergh
Op za 3 aug 2024, 20:58 schreef Zulfi Khan :
> Hi,
>
> I have written the following function:
>
>
> private boolean jDelBtnActionPerformed(java
