Java学习笔记——Map接口

Map接口

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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