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byte_coder90
·
How to efficiently iterate over all entries in a Java Map?
Hi everyone! I'm a beginner Java developer, and I have a problem with iterating over elements in a HashMap. I need to go through all keys and values to, for example, display them on the screen or perform some calculations.
Currently I'm doing it like this:
```java
Map map = new HashMap<>();
map.put("apple", 1);
map.put("banana", 2);
map.put("cherry", 3);
for (String key : map.keySet()) {
Integer value = map.get(key);
System.out.println(key + " -> " + value);
}
```
This works, but I've heard there are more efficient ways. My code makes two calls to the map on each iteration: first it gets the key, then it gets the value by that key. Wouldn't it be faster if I iterated over key-value pairs directly?
I know that Java has the Map.Entry interface, but I'm not entirely
