whats an interface java

Interfaces specify what a class must do. It is the blueprint of the class. It is used to achieve total abstraction. We are using implements keyword for interface. Basic statement we all know in Selenium is WebDriver driver = new FirefoxDriver(); WebDriver itself is an Interface. So we are initializing Firefox browser using Selenium WebDriver. It means we are creating a reference variable of the interface and creating an Object. So WebDriver is an Interface and FirefoxDriver is a class.

java interface

class ACMEBicycle implements Bicycle {

    int cadence = 0;
    int speed = 0;
    int gear = 1;

   // The compiler will now require that methods
   // changeCadence, changeGear, speedUp, and applyBrakes
   // all be implemented. Compilation will fail if those
   // methods are missing from this class.

    void changeCadence(int newValue) {
         cadence = newValue;
    }

    void changeGear(int newValue) {
         gear = newValue;
    }

    void speedUp(int increment) {
         speed = speed + increment;   
    }

    void applyBrakes(int decrement) {
         speed = speed - decrement;
    }

    void printStates() {
         System.out.println("cadence:" +
             cadence + " speed:" + 
             speed + " gear:" + gear);
    }
}

Posted by: Guest on July-19-2021

Source

interface Moveable { int AVG_SPEED = 40; void move(); } class Vehicle implements Moveable { public void move() { System.out.println ("Average speed is"+AVG-SPEED"); } public static void main (String[] arg) { Vehicle vc = new Vehicle(); vc.move(); } }

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