exception doubt

[vivek sivakumar]

package languagefundamentals;
import languagefundamentals.obj;
public class mainforinterface1 extends obj implements Interface1 {
public int doit(String s)
{
System.out.println(s);
return 0;
}
public static void main(String[] args) {
mainforinterface1 mymain = new mainforinterface1();
mymain.doit("vivek");
try {
mymain.finalize();// 1
}
catch(Exception Throwable){
}
}
}
well when i compile im getting a "mainforinterface1.java": Error #: 360 : unreported exception: java.lang.Throwable; must be caught or declared to be thrown at line 13, column 20
why is this problem ,

[R K Singh]

hope that helps