import java.util.*;
class HashSetTest
{

    public static void main(String[] args)
    {
        HashSet hs = new HashSet();

        hs.add(new Person("a1",11));   //将Person类添加进Hashset里面
        hs.add(new Person("a2",12));
        hs.add(new Person("a3",13));

        Iterator it = hs.iterator();   //定义2个迭代器
        Iterator it2 = hs.iterator();
        while(it.hasNext()&it2.hasNext()) //开始遍历HashSet
        {
//          System.out.println(it.next().getClass().toString());   //测试类型，结果为class Person
            Person p = (Person) it.next();
//          Person p = it.next();     //这样写就会报错，Error:(19, 31) java: 不兼容的类型: java.lang.Object无法转换为Person
            Object obj=it2.next();        
            System.out.println(p.getName()+"::"+p.getAge());
        }
    }
}

class Person  //定义Person类
{
    private String name;
    private int age;
    Person(String name,int age)
    {
        this.name = name;
        this.age = age;
    }

    public int hashCode()
    {
        System.out.println(this.name+"....hashCode");
        return name.hashCode()+age*37;
    }

    public boolean equals(Object obj)
    {

        if(!(obj instanceof Person))
            return false;

        Person p = (Person)obj;
        System.out.println(this.name+"...equals.."+p.name);

        return this.name.equals(p.name) && this.age == p.age;
    }


    public String getName()
    {
        return name;
    }
    public int getAge()
    {
        return age;
    }
}