Java Lambda is a new feature introduced in Java 8 that allows developers to write more concise and readable code. It is a functional programming construct that enables the use of lambda expressions in Java code. Lambda expressions are anonymous functions that can be passed around as values and used to represent code blocks.
Before the introduction of Java Lambda, Java code was often verbose and difficult to read. With Lambda, developers can write code that is more concise and easier to understand. This is because Lambda expressions allow developers to write code that is more declarative and less procedural.
Here is an example of how Lambda can be used to simplify code:
List<String> names = Arrays.asList("John", "Jane", "Bob", "Alice");
// Without Lambda
Collections.sort(names, new Comparator<String>() {
public int compare(String s1, String s2) {
return s1.compareTo(s2);
}
});
// With Lambda
Collections.sort(names, (s1, s2) -> s1.compareTo(s2));
In the above example, the Lambda expression is used to replace the anonymous inner class that was used to define the Comparator. This makes the code more concise and easier to read.
Another advantage of Lambda is that it enables developers to write code that is more modular and reusable. This is because Lambda expressions can be passed around as values and used to represent code blocks. This makes it easier to write code that is more modular and reusable.
Here is an example of how Lambda can be used to write more modular and reusable code:
public interface Operation {
int operate(int a, int b);
}
public class Calculator {
public int calculate(int a, int b, Operation operation) {
return operation.operate(a, b);
}
}
// Without Lambda
Calculator calculator = new Calculator();
int result = calculator.calculate(10, 5, new Operation() {
public int operate(int a, int b) {
return a + b;
}
});
// With Lambda
Calculator calculator = new Calculator();
int result = calculator.calculate(10, 5, (a, b) -> a + b);
In the above example, the Lambda expression is used to replace the anonymous inner class that was used to define the Operation interface. This makes the code more modular and reusable.
Overall, Java Lambda is a powerful feature that enables developers to write more concise, readable, modular, and reusable code. It is a functional programming construct that allows the use of Lambda expressions in Java code. Lambda expressions are anonymous functions that can be passed around as values and used to represent code blocks.