泛型的疑惑 - 黑马程序员技术交流社区

import java.util.*;
public class GenListTest {
public static void PrintElements(Collection<String> c)
{
Iterator<String> it =c.iterator();
while(it.hasNext())
{
System.out.println(it.next());
}
}
public static void main(String[] args)
{
List<String> l=new ArrayList<String>();
l.add(new Person(20,"zhangsan"));<font color="#ff0000">//这样的写法错误，正确的应该怎么写？</font>
l.add(new Person(23,"lisi"));
System.out.println(l.size());
Collections.sort(l);
PrintElements(l);
}
}
class Person implements Comparable<Person>
{
private int age;
private String name;
Person(int age,String name)
{
this.age=age;
this.name=name;
}
public int compareTo(Person p)
{
return age>p.age ? 1 :(age==p.age ? 0 :-1);
}
}

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