Here's a great look at what Java 8 brought to ConcurrentHashMaps, including close looks at the methods at your disposal and their performance impacts. Let's explore it with us now.
Whilst doing some refactoring on updates to ConcurrentHashMap values, I came across these great articles ...
... and was inspired to try to develop the theme a bit further.
Pre-Java 8, we had various ways to try to perform atomic operations on the values of Concurrent collections as described by Dima.
For example, a simple counter:
// Incrementing a count of the occurrences of a currency symbol
// (In reality we would have used an atomic variable even pre Java 8)
ConcurrentHashMap <String Integer> map = new ConcurrentHashMap <>();
String key = "USD/JPY";
Double oldValue; Double newValue; double increment = 1.0;
oldValue = results.get(key);
newValue = oldValue == null? increment: oldValue + increment;
} while (!results.replace(key, oldValue, newValue));
What is OpenJDK? OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE).
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