Lambda Expressions Body
Description
The lambda expression body can be a block statement or a single expression.
A block statement is enclosed in braces while a single expression can exist without braces.
In the block statement we can use return statement to return value.
The following lambda expression uses a block statement and use return
statement to return the sum.
(int x, int y) -> { return x + y; }
While the following lambda uses an expression:
(int x, int y) -> x + y
The expression doesn't require the braces.
The lambda is not necessary to return a value. The following two lambda expressions just output the parameter to standard output and don't return anything.
(String msg)->{System.out.println(msg);}// a block statement
(String msg)->System.out.println(msg) //an expression
Example
public class Main {
public static void main(String[] argv) {
Processor stringProcessor = (String str) -> str.length();
String name = "Java Lambda";
int length = stringProcessor.getStringLength(name);
System.out.println(length);// w w w. j a v a 2 s . co m
}
}
@FunctionalInterface
interface Processor {
int getStringLength(String str);
}
The code above generates the following result.
