Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Explain the equals() method
The equals() method of java.lang.Object acts the similar as the == operator; that is, it tests for object identity rather than object equality. The implicit contract of the equals() method, thus, is that it tests for equality rather than identity. Therefore most classes will override equals() along with a version that does field through field comparisons before deciding while to return true or false.
To elaborate, an object created through a clone() method (that is a copy of the object) should pass the equals() test if neither the original nor the clone has changed because the clone was created. Therefore the clone will fail to be == to the original object.
For instance, here is an equals() method you could use for the Car class. Two cars are equal if and only if their license plates are equal, and that's what this techniques tests for. public boolean equals(Object o) { if (o instanceof Car) { Car c = (Car) o; if (this.licensePlate.equals(c.licensePlate)) return true; } return false; }This example is particularly interesting since it demonstrates the impossibility of writing a useful generic equals() method in which tests equality for any object. It is not sufficient to easily test for equality of all the fields of two objects. It is whole possible that some of the fields might not be relevant to the test for equality as in this instance where changing the speed of a car does not change the in fact car that's referred to.
Be careful to prevent this common mistake when writing equals() methods: public boolean equals(Car c) { if (o instanceof Car) { Car c = (Car) o; if (this.licensePlate.equals(c.licensePlate)) return true; } return false; }The equals() method must permit tests against any object of any class, not simply against other objects of the similar class (Car in this example.)
You do not requires to test whether o is null. null is never an instance of any class. null instanceof Object returns false.
Project Description: I need someone to prepare an android app for me and provide it to me asap. The app details to be provided on pm Skills required: Java, Android
Struts is depend on model 2 MVC (Model-View-Controller) architecture. Struts controller uses the command design pattern and the action classes use the adapter design pattern. The p
1. De normalizes your tables where required. 2. Proper use of index columns: An index based on numeric parts is more efficient than an index based on character columns. 3. Re
List down the Analytical Engine's elements name An analytical engine elements are as follows: Input Memory Processor Output.
Ask question Write an inheritance hierarchy for classes Quadrilateral, Trapezoid, Parallelogram, Rectangle and Square. Use Quadrilateral as the superclass of the hierarchy. Create
The SudCell Class A single cell in a Sudoku must clearly represent a number from 1 to 9 . But in a solver context, we need much more. It isn't enough to say "this c
What is the difference among session scope and request scope when saving formbean? Ans) When the scope is request, the values of formbean would be there for the current request.
How does JVm do dynamic checking The JVM also does "dynamic" checking at runtime for certain operations, like pointer and array access, to make sure they are touching only memo
Give an Examples of Access Protection ? This is how the Car class would almost certainly be written in practice. Remember that all the fields are now declared private, and the
write code employe managment
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd