Unleash the Power of Java HashMap’s forEach() Method
When working with Java’s HashMap, you often need to perform actions on each mapping. That’s where the forEach() method comes in – a game-changer for simplifying your code.
The Syntax Unraveled
The forEach() method takes a single parameter: an action to be performed on each mapping of the HashMap. This action is defined using a lambda expression, which allows you to specify the operation you want to execute on each entry.
Putting it into Practice
Let’s create a HashMap named prices and see how forEach() works its magic. By passing a lambda expression as an argument to the forEach() method, we can reduce each value by 10% and print all the keys and reduced values. The result? A concise and efficient way to process your HashMap data.
Key Takeaways
- The
forEach()method doesn’t return any value; it’s all about performing actions on your HashMap entries. - Don’t confuse
forEach()with the for-each loop; while both can be used to loop through each entry, they serve distinct purposes.
Exploring Further
Want to dive deeper into lambda expressions? Check out our guide to Java Lambda Expressions. And if you’re interested in learning more about iterating over collections, take a look at Java ArrayList forEach().