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How to implement reference to an instance method of a particular object in Java?
Method reference is a simplified form of a lambda expression that can execute one method. It can be described using "::" symbol. A reference to the instance method of a particular object refers to a non-static method that is bound to a receiver.
Syntax
ObjectReference::instanceMethodName
Example - 1
import java.util.*; public class InstanceMethodReferenceTest1 { public static void main(String[] args) { String[] stringArray = { "India", "Australia", "England", "Newzealand", "SouthAfrica", "Bangladesh", "WestIndies", "Zimbabwe" }; Arrays.sort(stringArray, String::compareToIgnoreCase); System.out.println(Arrays.toString(stringArray)); } }
Output
[Australia, Bangladesh, England, India, Newzealand, SouthAfrica, WestIndies, Zimbabwe]
Example - 2
@FunctionalInterface interface Operation { public int average(int a, int b); } class MathUtility { public int getAverage(int x, int y){ return (x+y)/2; } } public class InstanceMethodReferenceTest2 { public static void main(String[] args) { MathUtility mathUtilityObject = new MathUtility(); Operation operationObject = mathUtilityObject::getAverage; int result = operationObject.average(50, 30); System.out.println("Average of two numbers: "+ result); } }
Output
Average of two numbers: 40
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