What are lambda expressions?
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Lambda expressions in Java are a feature introduced in Java 8 that allow you to write anonymous functions (functions without a name) in a concise way. They are primarily used to implement functional interfaces (interfaces with a single abstract method).
Syntax:
(parameters) -> expression
or
(parameters) -> { statements }
Example:
(List<String> list) -> list.isEmpty()
Here’s a real-world example:
List<String> names = Arrays.asList("John", "Alice", "Bob");
names.forEach(name -> System.out.println(name));
In the example above, name -> System.out.println(name) is a lambda expression.
Key Benefits:
Concise code: Reduces boilerplate code for functional interfaces.
Readability: Makes code cleaner, especially with collections.
Used with streams and functional APIs.
Functional Interface Example:
@FunctionalInterface
interface MyFunc {
void show();
}
MyFunc f = () -> System.out.println("Hello from lambda");
f.show();
Common Use Cases:
With Collections (e.g., forEach, sort, filter).
In Streams API for filtering, mapping, reducing.
Important Notes:
Can only be used with functional interfaces.
Improves code style in event handling, threading, and collection processing.
In short, lambda expressions bring functional programming to Java, making code more expressive and compact.
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