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How can we use this and super keywords in method reference in Java?
The method reference is similar to a lambda expression that refers to a method without executing it and "::" operator can be used to separate a method name from the name of an object or class in a method reference.
The methods can be referenced with the help of this and super keywords in Java. The super keyword can be used as a qualifier to invoke the overridden method in a class or an interface.
syntax
this::instanceMethod TypeName.super::instanceMethod
Example
import java.util.function.Function; interface Defaults { default int doMath(int a) { return 2 * a; } } public class Calculator implements Defaults { @Override public int doMath(int a) { return a * a; } public void test(int value) { Function<Integer, Integer> operator1 = this::doMath; System.out.println("this::doMath() = " + operator1.apply(value)); Function<Integer, Integer> operator2 = Defaults.super::doMath; System.out.println("Defaults.super::doMath() = " + operator2.apply(value)); } public static void main(String[] args) { Calculator calc = new Calculator(); calc.test(10); } }
Output
this::doMath() = 100 Defaults.super::doMath() = 20
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