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用循环或者迭代器

创建set的iterator

Set set = new HashSet();

Iterator it = set.iterator();

while(it.hasNext())//判断是否有下一个

it.next()取出元素

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import java.util.HashSet;

import java.util.Iterator;

import java.util.Set;

class ADD{

public String a;

public static void main(String[] args) {

ADD a = new ADD();

a.a = “a”;

ADD b = new ADD();

b.a = “b”;

Set set = new HashSet();

set.add(a);

set.add