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How many parameters can a lambda expression have in Java?
The lambda expressions are easy and contain three parts like parameters (method arguments), arrow operator (->) and expressions (method body). The lambda expressions can be categorized into three types: no parameter lambda expressions, single parameter lambda expressions and multiple parameters lambda expressions.
Lambda Expression with no parameter
We need to create no parameter lambda expression then start the expression with empty parenthesis.
Syntax
() -> {
//Body of no parameter lambda
}Example(no parameter Lambda)
import java.util.function.*;
import java.util.Random;
public class LambdaExpression1 {
public static void main(String args[]) {
NumberUtil num = new NumberUtil();
int randVal = num.getRandomValue(
() -> { // no parameter lambda
Random random = new Random();
return random.nextInt(500);
});
System.out.println("The value returned from Lambda is: "+ randVal);
}
private static class NumberUtil {
public int getRandomValue(Supplier<Integer> supplier) {
return supplier.get();
}
}
}Output
The value returned from Lambda is: 144
Lambda Expression with single Parameter
We need to create lambda expression with a single parameter then start the expression with a parenthesis of a single argument.
(p1) -> {
//Body of single parameter lambda
}Example (a single parameter Lambda)
import java.util.function.*;
public class LambdaExpression2 {
public static void main(String args[]) {
Validator validator = new Validator();
String city = "Hyderabad";
boolean isValid = validator.isDataValid(city,
(String info) -> { // single parameter lambda
String regx = "^[a-zA-Z0-9]*$";
return info.matches(regx);
});
System.out.println(" The value returned from lambda is: "+ isValid);
}
private static class Validator {
public boolean isDataValid(String data, Predicate<String> predicate) {
return predicate.test(data);
}
}
}Output
The value returned from lambda is: true
Lambda Expression with multiple parameters
We need to create lambda expression with multiple parameters then start the expression with parenthesis of multiple arguments.
(p1,p2) -> {
//Body of multiple parameter lambda
}Example (multiple parameters Lambda)
import java.util.function.*;
public class LambdaExpression3 {
public static void main(String args[]) {
Message m = new Message();
m.printStringInteger("Java", 75,
(String str, Integer number) -> { // multiple parameters lambda
System.out.println("The values are: "+ str + " "+ number);
});
}
private static class Message {
public void printStringInteger(String str, Integer number, BiConsumer<String, Integer> biConsumber) {
biConsumber.accept(str, number);
}
}
}Output
The values are: Java 75
Updated on: 10-Jul-2020
3K+ Views
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