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Differences between Method Reference and Constructor Reference in Java?
A method reference is similar to lambda expression used to refer a method without invoking it while constructor reference used to refer to the constructor without instantiating the named class. A method reference requires a target type similar to lambda expressions. But instead of providing an implementation of a method, they refer to a method of an existing class or object while a constructor reference provides a different name to different constructors within a class.
syntax - Method Reference
<Class-Name>::<instanceMethodName>
Example
import java.util.*;
public class MethodReferenceTest {
public static void main(String[] args) {
List<String> names = new ArrayList<String>();
List<String> selectedNames = new ArrayList<String>();
names.add("Adithya");
names.add("Jai");
names.add("Raja");
names.forEach(selectedNames :: add); // instance method reference
System.out.println("Selected Names:");
selectedNames.forEach(System.out :: println);
}
}Output
Selected Names: Adithya Jai Raja
Syntax -Constructor Reference
<Class-Name>::new
Example
@FunctionalInterface
interface MyInterface {
public Student get(String str);
}
class Student {
private String str;
public Student(String str) {
this.str = str;
System.out.println("The name of the student is: " + str);
}
}
public class ConstrutorReferenceTest {
public static void main(String[] args) {
MyInterface constructorRef = Student :: new; // constructor reference
constructorRef.get("Adithya");
}
}Output
The name of the student is: Adithya
Updated on: 11-Jul-2020
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