public void get(int a)
public static void main(String s)
Run ob=new Run();
and error message
ArgumentException.java:16: error: method get in class Run cannot be applied to g
reason: actual argument double cannot be converted to int by method invocation
That has absolutely NOTHING to do with Exceptions.
The method needs an int parameter, and you passsed a double.
You use an IllegalArgumentException when the parameter is of the right kind (compiles OK) but its value is illegal. eg parameter isDate dateOfBirth, the value passed is a date, but it's a date in the future. Or,the parameter is double price, the value passed is a number, but its <0.0
I just showed how an IllegalArgumentException is created and thrown.
Because it's an unchecked exception you can handle it (via try/catch or by declaring your method as throws IllegalArgumentException) or you can ignore it and allow your program to crash when it is thrown.
handled/unhandled is not an attribute of the exception, it's an attribute of the code that can cause the execption to be thrown.