Printing HashMap In Java

Print specific HashMap values

In a situation where only certain values are needed:

for (String key : hashMap.keySet()) {
    System.out.println(key + "=" + hashMap.get(key));
}


This targets specific keys in your iterative loop to return their corresponding values. // Code says: "Key, your secret Value. Please, reveal yourself!"

Display HashMap entries

Representing a HashMap visually:

Key:     | Value:
---------|---------
Color    | Blue
Size     | Medium
Material | Cotton

Highlighting its contents using different iterative approaches:

entrySet() magic

for (Map.Entry<String, String> entry : hashMap.entrySet()) {
    System.out.println(entry.getKey() + " - " + entry.getValue());
}


Iterates over entries rather than keys, saving us from calling get() over and over. // No need to badger each key with get() calls!

Key spree

for (String key : hashMap.keySet()) {
    System.out.println("Key: " + key + " Value: " + hashMap.get(key));// Key : "Sure, Value is ...."
}


Direct emphasis on keys, allowing us to fetch each key's value. //Code whispers: "Dear Key, tell me your secret Value!"

Values galore

for (String value : hashMap.values()) {
    System.out.println("Value: " + value);
}


This one's for the times you're interested in values only and couldn't care less about their keys. // Code: "Value, is that you? I've been expecting you!"

Decoding HashMap capacities

Revisiting the size and capacity of a HashMap:

• The size() method counts key-value pairs (entries), returning a positive integer, not zero or negative.
• Initial capacity and load factor walk hand in hand, silently determining HashMap performance.

Note, zero-based numbering refers to lists and arrays; not applicable to HashMap size.