errlist.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter11;
import java.util.*;
import chapter7.Duck;
public class ErrList 
{
	public static void main(String args[])
	{
		List ls = new LinkedList();
		ls.add(new Integer(0));
		ls.add(new Duck());
		Iterator it = ls.iterator();
		while(it.hasNext())
		{
			Integer x = (Integer) it.next();
		    int i = x.intValue();
		    System.out.println(i);
		}
	    
	}
}