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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; } }
The game of Life, invented by John Conway, is supposed to model the genetic laws for birth, survival, and death (see Scienti_c American, October 1970, p. 120). We will play it on a
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Write a program to add integer value? class AddInts { public static void main (String args[]) { int i = 1; int j = 2; System.out.println("i is " + i); System.out.println("
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These are the central working units of JavaScript. Almost all the scripting code employs one or more functions to obtain the desired result. If you desire your page to provide cert
Synchronous messaging involves a client that waits for the server to respond to a message. So if one end is down the whole communication will fail.
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