13.
class Super {
public Integer getLenght( ) { return new Integer(4); }
}
public class Sub extends Super {
public Long getLenght( ) { return new Long(5); }
public static void main(String[] args) {
Super sooper = new Super( );
Sub sub = new Sub( );
System.out.println(sooper.getLenght( ).toString( ) + "," +
sub.getLenght( ).toString( ) );
}
}
输出是什么?