Java HashMap Initialization Guide

1 year ago
Isabella Edwards
1 minute

In Java, you can initialize and assign values to a HashMap object using the constructor and put method.

Option 1: Initialize and assign values using a constructor method.

Map<String, Integer> map = new HashMap<String, Integer>() {{
    put("key1", 1);
    put("key2", 2);
    put("key3", 3);
}};

Option 2: Add key-value pairs one by one using the put method.

Map<String, Integer> map = new HashMap<>();
map.put("key1", 1);
map.put("key2", 2);
map.put("key3", 3);

Both methods can be used to initialize and assign values to a HashMap object. The first method uses double braces initialization, which allows you to directly add key-value pairs during initialization, making it more concise. The second method involves adding key-value pairs one by one, making it more straightforward.

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