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How to use Consumer and BiConsumer interfaces in lambda expression in Java?
A Consumer interface is a predefined functional interface that can be used when creating lambda expressions or method references. This interface represents an operation that accepts a single input parameter and doesn't return anything. It contains only one method named accept(). The BiConsumer interface is similar to a Consumer interface and accepts two input parameters and doesn’t return anything.
Syntax
@FunctionalInterface public interface Consumer<T> @FunctionalInterface public interface BiConsumer<T, U>
Example
import java.util.*; import java.util.function.*; public class ConsumerBiConsumerTest { public static void main(String[] args) { Consumer<String> c = (x) -> System.out.println(x.toLowerCase()); // lambda expression c.accept("Raja"); Consumer<Integer> con = (x) -> { // lambda expression System.out.println(x + 10); System.out.println(x - 10); }; con.accept(10); BiConsumer<Strng, String> bc = (x, y) -> { System.out.println(x + y);}; bc.accept("1", "2"); List<Person> plist = Arrays.asList(new Person("RAJA"), new Person("ADITHYA")); acceptAllEmployee(plist, p -> System.out.println(p.name)); acceptAllEmployee(plist, p -> {p.name = "unknown";}); acceptAllEmployee(plist, p -> System.out.println(p.name)); } public static void acceptAllEmployee(List<Person> plist, Consumer<P> con) { for(Person p : plist) { con.accept(p); } } } // Person class class Person { public String name; public Person(String name) { this.name = name; } }
Output
raja 20 0 12 RAJA ADITHYA unknown unknown
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