Exception

[jperson]

package test;

public class Circle {
    private  double rad;
    public Circle(){
        this(1);
    }
    public Circle(int x){
        set(x);
    }
    public void set(int x)throws IllegalArgumentException{
        if(x>=0){
        this.rad = x;
        System.out.println(x);
        }
        else
            throw new IllegalArgumentException("radius must be possitive");
    }

}

in above example what's the benfit of using [throws IllegalArgumentException] ,
there is no effect if i remove it :confused:

[Fubarable]

Have a look at the tutorial on unchecked exceptions: Unchecked Exceptions — The Controversy (The Java™ Tutorials > Essential Classes > Exceptions)

The rest of the tutorial is pretty decent too.

Luck.

[Singing Boyo]

Whoa, almost misread that one as 'whats the benefit of throwing an IllegalArgumentException.' Must be tired...

Anyway, its really a documentation thing. For anyone reading your code, the [throws IllegalArgumentException] is an immediate note that the method can throw the aforementioned exception. If you don't have the declaration, someone using the method may not write code that is prepared to handle it in cases where it could be thrown (i.e. when using a value entered by the user).

[Prajin]

in above example what's the benfit of using [throws IllegalArgumentException] ,
there is no effect if i remove it :confused:

What you did after removing that exception, I guess, run program and pass the integer as argument.
Why not try to pass except int as argument? Then see the result.

IllegalArgumentException : - check the validity of method arguments,particularly important for constructors.

-Regards