[Solved] I’m a Java beginner- Convert String value to Integer using JTextField [closed]

by


It must throw NumberFormatException if you try to parse it to integer.

Check before parsing. or handle Exception properly.

    Exception Handling*

    try{
       int i = Integer.parseInt(input);
    }catch(NumberFormatException ex){ // handle your exception
       ...
    }

or 

- Integer pattern matching -

String input=...;
String pattern ="-?\\d+";
if(input.matches("-?\\d+")){ // any positive or negetive integer or not!
 ...
}

solved I’m a Java beginner- Convert String value to Integer using JTextField [closed]