Question: Why must classes that define an equals ( ) method also define a hashCode ( ) method

Why must classes that define an equals() method also define a hashCode() method

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

Q:

This project goal is to develop a rental media system This underneath UML diagram may help you to understand the system requirements MediaRentalManger Media Rentalint Media Comparable> Customer Game...

Q:

Application: Write a Fraction API Addition [a/b + c/d]: (a*d + b*c) / b*d Subtraction [a/b - c/d]: (a*d b*c) / b*d Multiplication [a/b * c/d]: a*c / b*d Division [(a/b) / (c/d)]: a*d / b*c Before you...

Q:

Please modify the code to answer the following three questions. // Q1. Override the toString() method. Use String Builder to print "Point (x, y)" The x, y // value should be formatted to 3 decimal...

Q:

Java Tasks: I need help with Class Dir and Class BoardOptions. Below is an overview of the whole project. Here are the two tasks that I am seeking help. class Dir This class helps us represent the...

Q:

Imagine that you wanted to capture information about a collection of different types of vehicles (cars, trucks, motorcycles, etc.). To do so, you could use inheritance to create a collection of...

Q:

Problem 1: Understanding and using inheritance 10 points total; individual-only Imagine that you wanted to capture information about a collection of different types of vehicles (cars, trucks,...

Q:

JAVA Define the class called "Date" which will be used to read, create, and manipulate dates. The class has 3 instance variables as shown below: private int day; private int month; private int year;...

Q:

1. In Java, which technique can be implemented using the private access specifier? a. Constructor Collection b. Encapsulation c. Garbage Collection d. None of the above. 2. In Java, which of the...

Q:

Should be in Java Interface Worker should extend Serializable from java.io.* In addition to shown data fields, each Worker object should have a name field, a workerID field, and a Department...

Q:

a. Create a class named RectangularPrism that has instance variables length, width, and height. b. Create a constructor that sets those variables. Also, create get and set methods for each variable....

Q:

Seeprint Limited is negotiating an initial one year contract with an important customer for the supply of a specialized printed colour catalogue at a fixed contract price of 16 per catalogue....

Q:

Decide upon an initiative you want to implement that would increase sales over the next five years, (for example, market another product, corporate expansion, and so on). Using the sample financial...

Q:

Examine the following visualization, adapted from one that appeared in the post Who Are the Comic Book Fans on Facebook? on February 2, 2013, as reported by graphicspolicy.com. a. Describe at least...

Q:

The first scenario will be a Verbal Judo scenario in which your scenario follows the standard Verbal Judo interaction: You need to ask somebody to modify their behavior either to do something or to...

Q:

Describe a circumstance that would require a businessperson to transmit an unsolicited negative message. For this circumstance, explain the plan of organization that you would use and justify your...

Q:

Holiday Invitation. Its mid-October, time to invite local schoolchildren to dress in costumes and trick-or-treat at West Lake Mall. As mall manager, write to the presidents of the local Parent-...

Q:

Over a 24-hour period, observe and record oral and written communication that you would classify as negative messages because they are unpleasant, disappointing, or upsetting to the receiver. Record...