如何使用LinkedHashMap来并发写和读

Question

无法同时读取修改后的linkedHashMap。我怎样才能以不同的方式做同样的工作！我想做的就是这种事！

while(flag) 
    for(String key:hashMap.keySet())
    {

        if(hashMap.get(key)==false)
        {
            hashMap.put(key,true);
            System.out.println(key+"\t\t\t:PACKAGE");
            String query="select REFERENCED_NAME from ALL_DEPENDENCIES where OWNER='xyz' AND REFERENCED_OWNER='xyz' AND NAME='"+key+"' AND TYPE='PACKAGE BODY' AND REFERENCED_TYPE='PACKAGE' AND REFERENCED_NAME<>'"+key+"'";
            ResultSet rs=statement.executeQuery(query);
            while(rs.next()&&(rs.getString(1)!=key))
            {

                if((hashMap.get(rs.getString(1)) ==null) || !(hashMap.get(rs.getString(1))== true)){
                    hashMap.put(rs.getString(1),false);
                    System.out.println(rs.getString(1));
                }
            }
            //System.out.println("NEW :"+key);


            rs.close();
        }
    }

    flag=hashMap.containsValue(false);
    }

Answer 1

使用了ConcurrentHashMap，问题解决了！