Map接口

Map接口中键和值一一映射. 可以通过键来获取值。
异常
- NoSuchElementException：访问的值不存在
- ClassCastException：对象类型错误
- UnsupportedOperationException：尝试修改一个只读的Map

常用方法

Entry是Map接口中提供的一个静态内部嵌套接口。简单来说Entry就是一个包含键和值的对象

getKey()方法：获取Entry对象中的键
getValue()方法：获取Entry对象中的值

 public class MapDemo {

     public static void main(String[] args) {

         //创建Map对象

         Map<String, String> map = new HashMap<String,String>();

         //给map中添加元素

         map.put("邓超", "孙俪");

         map.put("李晨", "范冰冰");

 map.put("刘德华", "柳岩");

         //获取Map中的所有key与value的对应关系

         Set<Map.Entry<String,String>> entrySet = map.entrySet();

         //遍历Set集合

         Iterator<Map.Entry<String,String>> it =entrySet.iterator();

         while(it.hasNext()){

             //得到每一对对应关系

             Map.Entry<String,String> entry = it.next();

             //通过每一对对应关系获取对应的key

             String key = entry.getKey();

             //通过每一对对应关系获取对应的value

             String value = entry.getValue();

             System.out.println(key+"="+value);

         }

     }

 }

HashMap<K,V>类

存储数据采用的哈希表结构，元素的存取顺序不能保证一致。
由于要保证键的唯一、不重复，需要重写键的hashCode()方法、equals()方法。
非线程安全
可以存null键、null值

LinkedHashMap<K,V>类

HashMap下有个子类LinkedHashMap，存储数据采用的哈希表结构+链表结构。
通过链表结构可以保证元素的存取顺序一致；
通过哈希表结构可以保证的键的唯一、不重复，需要重写键的hashCode()方法、equals()方法。

Hashtable类

与HashMap类似，但Hashtable不可以存null键null值
线程安全，较HashMao效率较低

注意

Map接口中的集合都有两个泛型变量<K,V>,在使用时，要为两个泛型变量赋予数据类型。两个泛型变量<K,V>的数据类型可以相同，也可以不同。

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-->

巴特西

Java学习笔记——Map接口

Map接口

Map接口

HashMap<K,V>类

LinkedHashMap<K,V>类

Hashtable类

注意

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