IllegalArgumentException

Reason Thrown to indicate that a method has been passed an illegal or inappropriate argument. argument is actual values that are passed to variables If you put any actual values that is not correct for the variable, it will cause IllegalArgumentException Example int a = 2147483649; // value is too big int a = -2147483649; // value is too small String date="08-07-1990"; // format is dd-MM-yyyy Date format=new SimpleDateFormat("dd/MM/yyyy").parse(date);// format is different Solution check input value range check calculation that can be over the variable limitation use try-catch block