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What is the Identity() method of the IntUnaryOperator in Java?

abhilash

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

In Java, identity is a static method of the IntUnaryOperator interface, used to return an IntUnaryOperator that always returns the input argument.

Syntax

static IntUnaryOperator identity()

Parameters

The method takes no parameters.

Return value

The method returns an IntUnaryOperator that always returns its input argument.

Example

import java.util.function.IntUnaryOperator;
public class Main {
public static void main(String[] args){
IntUnaryOperator identity = IntUnaryOperator.identity();
int arg = 343;
int arg1= 12;
System.out.printf("(%s == identity.applyAsInt(%s)) = %s \n", arg1, arg1, (arg1 == identity.applyAsInt(arg1)));
System.out.printf("(%s == identity.applyAsInt(%s)) = %s \n", arg1, arg, (arg1 == identity.applyAsInt(arg)));
System.out.printf("(%s == identity.applyAsInt(%s)) = %s \n", arg, arg1, (arg == identity.applyAsInt(arg1)));
System.out.printf("(%s == identity.applyAsInt(%s)) = %s", arg, arg, (arg == identity.applyAsInt(arg)));
}
}
Implementation of the "identity" method

Explanation

  • Line 1: We import the IntUnaryOperator interface.
  • Line 6: We use the identity() method to define an identity function.
  • Lines 7–8: We define two integer values called arg and arg1.
  • Lines 10–13: We use applyAsInt() to check whether the integer values arg, arg1, and the value returned are equal.

RELATED TAGS

java
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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