What are some examples of Java collection classes?
An example of an AI chatbot conversation about Java collection classes and their usage.
What are some examples of Java collection classes?
Java provides several collection classes like ArrayList, HashSet, and HashMap. Would you like to know more about any specific one?
Can you explain how ArrayList works?
Sure! An ArrayList is a resizable array implementation of the List interface. It allows dynamic arrays that can grow as needed.
What about HashMap? How is it different from ArrayList?
A HashMap stores key-value pairs and allows for fast retrieval based on keys, while an ArrayList is indexed by integers.
Can you give me a code example of using HashMap?
Certainly! Here's a simple example:
HashMap<String, Integer> map = new HashMap<>();
map.put("Apple", 1);
map.put("Banana", 2);
System.out.println(map.get("Apple")); // Outputs 1
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