How Java HashMap Works

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YouTube Excerpt: Can you explain how Java HashMap works? A Map in Java stores key and volume pairs. Keys have to be unique, and knowing the key lets you find the value. I knew that much. A HashMap is basically an array with lots of numbers, and the key lets you identify which value in that array or map of values to use. The HashMap class is how you implement the map interface. Why not just use arrays or strings to store values? Using a hash table with the map interface standardizes the time it takes to use operations like get and put. HashMaps may be used to pull up account balances, last time someone logged in or other stored values. I never thought though that the speed at which it is retrieved mattered. You create a HashMap with the command HashMap string integer cache equals new hashmap string integer () semicolon. I thought there were other ways to create one. Java will let you create a new HashMap copying data from another HashMap. Or create a Hashtable. But how does the HashMap work? You retrieve values from a HashMap by naming the string key, then writing string value equals map.get key. Then you tell it system out print in key plus key plus value plus value. It should then print out the value of that key location as an output. That's right. The HashMap stores the values, and Java will retrieve the value referenced by the key like picking out the inventory on shelf 83, slot 5. I've heard there were other benefits to using a HashMap. Since the code knows exactly where to look for values, it retrieves values in the Hashmap faster than other methods. And it won't error out unless the value in the Hashmap is somehow an error in and of itself. With Java, that's not hard to do. HashMaps and HashTables also do not care about duplicate values, as long as the keys are different. They could all be zero, as long as they all have separate addresses. And the Java HashMap is the way it references those unique addresses.

Can you explain how Java HashMap works? A Map in Java stores key and volume pairs. Keys have to be unique, and knowing the key lets you find the...

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