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What are the rules for the body of lambda expression in Java?
A lambda expression is an anonymous function (nameless function) that has passed as an argument to another function. We need to follow some rules while using the body of a lambda expression.
Rules for the body of a lambda expression
- The body of the lambda expression can be either a single expression or more statements.
- If we are using a single expression as the body of a lambda expression, then no need to enclose the body with curly braces ({}).
- If we are using one or more statements as the body of a lambda expression, then enclosing them within curly braces({}) can be mandatory.
Syntax
(parameters) OR () -> {body with statements separated by;} OR Single StatementExample
interface Message {
String message(String name);
}
public class LambdaExpressionBodyTest {
public static void main(String args[]) {
// Lambda expression using single expressio
Message msg1 = msg -> "TutorialsPoint " + msg;
System.out.println(msg1.message("Lambda Expression With Expression"));
// Lambda expression using statement
Message msg2 = msg -> { return "TutorialsPoint " + msg; };
System.out.println(msg2.message("Lambda Expression With Statement"));
// Lambda expression using multiple statements
Message msg3 = msg -> {
String hello = "TutorialsPoint " + msg;
return hello;
};
System.out.println(msg3.message("Lambda Expression With Multiple Statement"));
}
}Output
TutorialsPoint Lambda Expression With Expression TutorialsPoint Lambda Expression With Statement TutorialsPoint Lambda Expression With Multiple Statement
Updated on: 11-Jul-2020
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