Question

ArrayList<HashMap<String, Object>>如何更新键值对和删除键值对？

示例：
String[ ] name= new String[ ]{"张三","李四","王五","赵六","霍七"};
ArrayList<HashMap<String, Object>> arrayList = new ArrayList<HashMap<String, Object>>();
for( int i=0 ; i <name.length ; i++){
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("Name", name[ i ]);
arrayList.add(map);
}
请教大神们：
(问题1) 假如我要把“王五”改成“小明”该怎么更新这个键值？？？
(问题2) 假如我要删除“李四”该怎么写呢？

Answer 1

String[ ] name= new String[ ]{"张三","李四","王五","赵六","霍七"}; 
        ArrayList<HashMap<String, Object>> arrayList = new ArrayList<HashMap<String, Object>>();
        for( int i=0 ; i <name.length ; i++){
             HashMap<String, Object> map = new HashMap<String, Object>();
             map.put("Name", name[ i ]);
             arrayList.add(map);
        }
        // 修改制定key
        for (HashMap<String, Object> hashMap : arrayList)
        {
            if (hashMap.get("Name").equals("王五"))
            {
                hashMap.put("Name", "小明");
            }
        }
        // 官方推荐的删除方法
        Iterator<HashMap<String, Object>> iterator = arrayList.iterator();  
        while(iterator.hasNext())  
        {  
            if(iterator.next().get("Name").equals("李四"))  
            {  
                iterator.remove();  
            }  
        } 
        System.out.println(arrayList);
        
        运行结果：
        [{Name=张三}, {Name=小明}, {Name=赵六}, {Name=霍七}]

Answer 2

public static void main(String[] args) {

String[ ] name= new String[ ]{"张三","李四","王五","赵六","霍七"};

ArrayList<HashMap<String, Object>> arrayList = new ArrayList<HashMap<String, Object>>();

for( int i=0 ; i <name.length ; i++){

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

map.put("Name", name[ i ]);

arrayList.add(map);

}

HashMap<String, Object> remove = null ;

for (HashMap<String, Object> hashMap : arrayList) {

if(hashMap.get("Name").equals("王五"))

{

hashMap.put("Name", "小明");

}

if(hashMap.get("Name").equals("李四"))

{

remove = hashMap;

}

}

arrayList.remove(remove);

System.out.println(arrayList);

}