import java.util.*;
class HashSetDemo
{
public static void main(String[] args)
{
HashSet ht = new HashSet();
ht.add(new Student("小五",19));
ht.add(new Student("地方",139));
ht.add(new Student("小df",129));
ht.add(new Student("小dfaaadf",197));
Iterator it = ht.iterator();
while(it.hasNext())
{
System.out.println(it.next().name);
/*提示找不到符号,为什么it.next().getClass()方法返回的是Student对象,为什么it.next().name这条语句会出现错误*/
}
}
}
class Student
{
public String name;
public int num;
public Student(String name,int num)
{
this.name = name;
this.num = num;
}
} |
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