What is constraints explain with example, JAVA Programming

Assignment Help:

What is Constraints explain with example?

One of the purposes to use constructors and setter techniques rather than directly accessing fields is to enforce constraints. For example, in the Car class it's significant to make sure in which the speed is always less than or equal to the maximum speed and in which both speed and maximum speed are greater than or equal to zero.

You've already seen one instance of this in the accelerate() method which will not accelerate a car past its maximum speed.
void accelerate(double deltaV) {

this.speed = this.speed + deltaV;
if (this.speed > this.maxSpeed) {
this.speed = this.maxSpeed;
}
if (this.speed < 0.0) {
this.speed = 0.0;
}
}
You can also insert constraints such as that in the constructor. For instance, this Car constructor makes sure in which the maximum speed is greater than or equal to zero:
Car(String licensePlate, double maxSpeed) {

this.licensePlate = licensePlate;
this.speed = 0.0;
if (maxSpeed >= 0.0) {
this.maxSpeed = maxSpeed;
}
else {
maxSpeed = 0.0;
}
}


Related Discussions:- What is constraints explain with example

Write a javascript program which having two functions, Write a JavaScript p...

Write a JavaScript program which having two functions that are sum and mean. The web page will ask the user to enter five values to be added. After taking input it will compute

Ps1 emulator for android, PS1 emulator for android There is an open sour...

PS1 emulator for android There is an open source app known as psx4droid i want a developer to solve problems and bugs and doing performance improvement to source code to running

Moving Blobs, Don''t know how to write this, can anyone help me? http://wi...

Don''t know how to write this, can anyone help me? http://wikisend.com/download/660980/Moving Blobs.zip

What is the use of mapmessage, A MapMessage carries name-value pair as its ...

A MapMessage carries name-value pair as its payload. Therefore its payload is same to the java.util.Properties object of Java. The values can be Java primitives or their wrappers

File handling operation, Write a program called Drivers that displays infor...

Write a program called Drivers that displays information about Formula 1 drivers and their teams.     The program starts by prompting (asking) the user for the name of an input tex

Convert psd to android, Convert PSD to Android (UI only, no database) Pr...

Convert PSD to Android (UI only, no database) Project Description: I want someone highly proficient in Photoshop and Android SDK to change series of PSD files into live Andro

Insert admob code into android application, Need to Insert Admob Code Into ...

Need to Insert Admob Code Into Android Application Project Description: We are seeking Android developer to add Admob code in to our application. It should be very simple

Video course on computer security needed, Video course on computer security...

Video course on computer security needed Project Description: We want a video course on computer security. Just like the way lynda provides. Skills required are Computer S

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd