public class Test {
    
    public static void main(String[] args) {
        InputStream urlis;
        BufferedReader urlin;
        
        try {
            urlis = new URL("HTTP://www.yahoo.com/").openStream();
        } catch(MalformedURLException mue) {
            mue.printStackTrace(System.out);    
        } catch(IOException ioe) {
            ioe.printStackTrace(System.out);
        }
        
        urlin = new BufferedReader(
            new InputStreamReader(urlis)
        );
        
        try {
            for (;;) {
                System.out.print(urlin.readLine());
            }
        } catch(IOException ioe) {
            ioe.printStackTrace();
        }
        System.exit(0);
    }
}

なあ、どうしてもコンパイルできないんだよ。なんで？
Test.java [26:1] Variable urlis may not have been initialized.
            new InputStreamReader(urlis)
                                  ^
1 error
って出る