quiz7_4.java

北京大学出版社的

public class Quiz7_4 {
   String s = "Good morning!";
   public Object clone()
            throws CloneNotSupportedException {
      Quiz7_4 result = (Quiz7_4) super.clone();
      return result;
   }
   public static void main( String[] args )
         throws CloneNotSupportedException {
      Quiz7_4 x = new Quiz7_4();
      Quiz7_4 y = (Quiz7_4) x.clone();
      System.out.println( y.s );
   }
}