hashmap

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Java best practices: Put/Get SubClass objects into HashMap that expects SuperClass objects

Let\'s say I instantiate a HashMap with SuperClass as value-type.I then add SubClass objects as values to the Map.When I retrieve those values from the Map, they are returned as objects of type SuperC[详细]

2023-04-01 08:07 分类：问答
Java: HashMap claims it has key, but somehow hasn't

I have a HashMap mapping objects of my Context class to Integers. In the Context class, I did override the public int hashCode() and public boolean equals(Object c) of java.lang.Object. However, I hav[详细]

2023-03-31 19:24 分类：问答
Shrink LinkedHashMap in Java

How can you shrink a LinkedHashMap? I overrode the removeEldestEntry method, but this method is only called once when a new value is inse开发者_如何学Pythonrted. So there is no change of making the ma[详细]

2023-03-31 16:50 分类：问答
Java - Can a hashmap have 4 generic parameters instead of 2?

This may be difficult to explain, but here goes: I want to store 3 integers and a String to a Hashmap, so I can retrieve data from the map, but it turns out that hashmaps only allow 2 generic paramet[详细]

2023-03-31 14:16 分类：问答
Adding values in to a HashMap

I need help to add the values from a String array into a HashMap. if (!loaded){ synchronized(syncLock){[详细]

2023-03-31 06:22 分类：问答
What is the difference between Collections from casted from a HashMap over entryset() and casted ArrayList for Jackson?

I am developing a Spring Rest application. One of my methods is that: @RequestMapping(method = RequestMethod.GET)[详细]

2023-03-30 13:49 分类：问答
Building a item-item matrix in java

I am building a item-item matrix and have the data in the following format UserX item1,item2,item3 userY item4,item5,item6[详细]

2023-03-30 02:06 分类：问答
Custom implementation of a HashTable in Java?

I was solving the Quora problem and for my particular solution I needed a hashtable (long-keys, int-values) for caching values. I hoped that the Java HashMap could be improved because I knew my data t[详细]

2023-03-29 16:45 分类：问答
Java hashmap search keys for a date

I have a hashmap: Map dateEvent = new HashMap(); where key is a date and time and value is a string. I fill collection with data where date开发者_开发百科 is in format dd.MM.yyyy HH:mm.[详细]

2023-03-29 00:49 分类：问答
Android image caching - hard and soft HashMaps question

What I\'m trying to do right now within my app is modify the ImageDownloader class that Google put out last year in one of their tutorials that asynchronous开发者_开发百科ly downloads and caches image[详细]

2023-03-28 17:08 分类：问答