map集合

Map<Person,String> map = new IdentityHashMap<Person,String>();

map.put(new Person(“张三”,45),"zhangsan");

map.put(new Person(“李四,45),"lisi");

Set<Map.Entity<Person,String>> iter = map.entitySet();

Iterator<Map.Entry<Prson,String>> iter = allset.iterator();

while(iter.hasNext()){

Map.Entity<Person,String> me = iter.next();

System.out.println(me.getKey()+"——>"+me.getValue());

}

java中用map可以用来表示一张表