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How to use a return statement in lambda expression in Java?
A return statement is not an expression in a lambda expression. We must enclose statements in braces ({}). However, we do not have to enclose a void method invocation in braces. The return type of a method in which lambda expression used in a return statement must be a functional interface.
Example 1
public class LambdaReturnTest1 {
interface Addition {
int add(int a, int b);
}
public static Addition getAddition() {
return (a, b) -> a + b; // lambda expression return statement
}
public static void main(String args[]) {
System.out.println("The addition of a and b is: " + getAddition().add(20, 50));
}
}Output
The addition of a and b is: 70
Example 2
public class LambdaReturnTest2 {
public static void main(String args[]) {
Thread th = new Thread(getRunnable());
th.run();
}
public static Runnable getRunnable() {
return() -> { // lambda expression return statement
System.out.println("Lambda Expression Return Statement");
};
}
}Output
Lambda Expression Return Statement
Updated on: 11-Jul-2020
10K+ Views
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