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What are the characteristics of lambda expressions in Java?
The lambda expressions were introduced in Java 8 and facilitate functional programming. A lambda expression works nicely together only with functional interfaces and we cannot use lambda expressions with more than one abstract method.
Characteristics of Lambda Expression
- Optional Type Declaration − There is no need to declare the type of a parameter. The compiler inferences the same from the value of the parameter.
- Optional Parenthesis around Parameter − There is no need to declare a single parameter in parenthesis. For multiple parameters, parentheses are required.
- Optional Curly Braces − There is no need to use curly braces in the expression body if the body contains a single statement.
- Optional Return Keyword − The compiler automatically returns the value if the body has a single expression to return the value. Curly braces are required to indicate that expression returns a value.
Syntax
parameter -> expression body
(int a, int b) -> {return a + b}Example
@FunctionalInterface
interface TutorialsPoint {
void message();
}
public class LambdaExpressionTest {
public static void main(String args[]) {
// Lambda Expression
TutorialsPoint tp = () -> System.out.println("Welcome to TutorialsPoint");
tp.message();
}
}Output
Welcome to TutorialsPoint
Updated on: 10-Jul-2020
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