quiz7_9.java

北京大学出版社的

public class Quiz7_9 {
   public static void main( String[] args ) {
      Integer i = new Integer( 6 );
      Long l = new Long( 10000000067L );
      Double d = new Double( 4.567 );
      Number n;
      n = d;
      d = i;
      l = (Long) i;
      System.out.println( l );
   }
}