I was told to change everything to HashMap() instead of ArrayList() and for the most part everything worked perfect.However, I am having a problem getting this one method to work properly.
开发者_运维知识库I am wondering how to efficiently subtract the values of two maps when their keys match. Currently I have 2 HashMap<String,Integer> and do it like this:
I\'m writing a line by line interpreter for class and I\'m using Java to do it.It needs to be dynamically scoped, which has proved to be mentally harder to implement than lexical scoping for me.(I mis
In my project, I\'m trying to build an adjacency matrix for a graph, and for space and time considerations we are supposed to use a sparse matrix, which, from my understanding, is most easily done wit
As a learning tool for DB4o and Java I have started to create a Telephone Directory. To do this I create an instance of a TelephoneDirectory which contains a year and a HashMap of entries.
Ho开发者_如何学Pythonw do I test / profile a hashCode() implementation in Java? i.e. is it distributing my test data reasonably evenly etc? Is there any simple crude way in java API itself?Map<Inte
I have a Java question about the best method to work with the following enum file that has been provided to me.
So, I wrote this function which gets a list of users and 开发者_JAVA技巧their locations (it\'s a mobile phone app), it sticks the correct values into the hashmap (ret.put(...)) but once the function r
I need a multi-threaded Map object to use in my web server\'s caching, and I need to have null keys. HashMap allows me to have null keys, but ConcurrentHashMap doesn\'t. I tried to create a synchroni
I am having some trouble with the HashMaps in my program.I have several declared at the top class like so:
加载中,请稍侯......