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.
What are the kinds of computer network according to the distance among nodes? The kinds of computer network according to the distance among nodes are: 1. LAN 2. WAN
Explain unicode in java? Java uses the Unicode character set. It is a two-byte character code set which has characters representing almost overall characters in almost all huma
What is the preferred organizational structure for the organization? The Network Organization is becoming the preferred organizational structure.
Describe Unbalanced Arrays ? Such as C Java does not have true multidimensional arrays. Java fakes multidimensional arrays by using arrays of arrays. This means that it is prob
write a program that counts the number of occurrences of the string in the n-th Padovan string P(n). program in java // aakash , suraj , prem sasi kumar kamaraj college
Collaboration diagrams are also communication diagrams. Collaboration diagrams give the same message as the sequence diagrams. But the collaboration diagrams depend on the object f
Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b
You need to build an agent system using the JADE Toolkit that allows the lecturer of FIT5031 to broadcast their availability and arrange for consultation with students in a dynamic
Rational Unified Process (RUP) is a normal framework that may be used to define a development process. The software development life cycle has got 4 parts in the following o
In an external JavaScript file write code that, upon form submission, scans the list of courses for a match (case should be insensitive). If a match is found, change the div's back
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