Why this code gets a warning?

[ImLazy]

Code: Select all

import java.util.*;
public class Base {
    private TreeSet set;
    public Base() {
        set = new TreeSet<String>();
        try {
            set.add("abc");
        } catch (Exception e) {}
    }
}

I compiled it by jdk1.5.0_06.

[Darko]

Well, you use a general set to store a set of Strings - declare it as

Code: Select all

private TreeSet<String> set;

and it should be OK

Btw, what are you catching there? I don't think add() throws anything.

[ImLazy]

Thank you.

BTW, the add() method thorws "ClassCastException". Of course we usually need not to catch it. But because I get warning, I just want to tell the compiler I do everything safely. Now I have deleted the "try" and "catch".