Question

language: scala

please explain every steps thanks

• Simulate a TV without using control flow (ie. Use the state pattern) • In a package named oop.tv, create a Class named TV with no constructor parameters • The TV class must contain the following methods as its API: • volumeUpo: Unit • volume Down(): Unit • mute(): Unit • powero: Unit • currentVolume(): Int In the tests package, write a test suite named Test TV that will test all the functionality on the spec sheet • Note: Only call the API methods while testing. Other methods variables you create will not exist in the grader submissions TV Spec Sheet • TV is initially off when created Initial volume is 5 When the TV is oft: • Volume up/down and mute buttons do nothing . Current volume is 0 The power button turns the TV on/off Volume up button increases volume by 1 up to a maximum volume of 10 • Volume down button decreases volume by 1 down to minimum volume of o Pressing the mute button mutes the TV When the TV is muted: . Current volume is 0 • Pressing the mute, volume up, or volume down buttons will unmute the TV and restore the volume to the pre- mute volume (Do not in/decrease the volume) When turning the TV back on the volume should return to its value when the TV was last on • When the TV is first turned on the volume will be 5 If the TV was turned off while muted, when it is turned back on it should not be muted

Answer 1

public class TV {

    public static void main(String[] args) {
        //create television object
        Television tv = new Television ();

        //invoke call methods on the object tv
        tv.changeChannel (1);
        tv.changeVolume (8);
        tv.printStatus ();

        System.out.println("I will change the the volume one time and the channel 5 times");
        tv.changeChannel(2);    tv.changeVolume(6);     tv.printStatus();
        tv.changeChannel(3);        tv.printStatus();
        tv.changeChannel(4);        tv.printStatus();
        tv.changeChannel(8);        tv.printStatus();
        tv.changeChannel(5);        tv.printStatus();

        }

}

//this is the blueprint
class TV {

    boolean power = true; //create a method for tv powerOnOff 
    int channel = 0;
    int volume = 0;


    void changeChannel (int newValue){//method to change the channel 
            channel = newValue; 
    }

    void changeVolume (int newValue){ //method to change the volume 
                volume = newValue;
    }

    void printStatus(){ //printing the status of the Television, channel and volume                 
        System.out.println("Channel: " + channel + " Volume: " + volume);
    }
}