Question

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1) Define a Java class for defining the activity of a TV set. The class contains A private int data field named channel that specifies what channel is currently set for the tuner (channels range from 1 to 120, default is 1) a. b. A private int data field named volumeLevel that specifies the volume level of the TV (range is 1 to 7; default is 1) A private boolean data field named on that determines whether the set is on or off (default off) c. d. Include a no-arg constructor that creates a default TV e. Include "getter" (accessor) methods for each data field f. Include a volumeUp method to increase the volume by one level (up to the max) and a volumeDown method to decrease the volume by one level (lowest IS g. Include a channelUp method to increase the channel by one (up to 120) and a channelDown method to decrease the channel by one (minimum of 1) and a setChannel method to set the channel to a valid channel (between 1 and 120) Include a turnOn method to turn on the TV and a turnOff method to turn it h. i. Write a toStringmethod (returns a String) that outputs the current state of the data fields in a string (e.g., TV set: on Volume: 3 Channel: Write the UML diagram for the class. To keep it all in one place, include the UML diagram as documentation in your source code for the class (i.e., comment lines). Write a test program (TestTV) that creates two TV objects and demonstrates the use of the methods defined tor the class

Answer 1

Television class

package abc1;

public class Television {

//Member variables as stated in question

private int channel;

private int volumeLevel;

private boolean status;

//getter methods

int getChannel() {

return channel;

}

int getVolume() {

return volumeLevel;

}

boolean getStatus() {

return status;

}

//no-arg constructor and default values of the variables

Television(){

channel = 1;

volumeLevel = 1;

status = false;

}

void volumeUp() {

if(volumeLevel<7) {

volumeLevel++;

}

System.out.println("Volume is " + volumeLevel);

}

void volumeDown() {

if(volumeLevel>0) {

volumeLevel--;

}

System.out.println("Volume is " + volumeLevel);

}

void channelUp() {

channel = (getChannel() +1);

if(channel>120)

channel = (channel % 120) -1 ;

System.out.println("Channel is " + getChannel() );

}

void channelDown() {

channel = channel - 1;

if(channel<0)

channel = channel + 121;

System.out.println("Channel is " + channel );

}

void setChannel(int i) {

if(i>=0 && i<=120)

channel = i;

}

void turnOn() {

status = true;

System.out.println("TV is switched on.");

}

void turnOff() {

status = false;

System.out.println("TV is switched off. ");

}

public String toString() {

String str = "";

str = str + "TV set: ";

if(status==true)

str = str + "on ";

else

str = str + "off ";

str = str + " Volume: " + volumeLevel + " ";

str = str + " Channel: " + channel;

return str;

}

}

Test program

package abc1;

public class TestTv {

public static void main(String[] args) {

Television tv1, tv2;

tv1 = new Television();

tv2 = new Television();

System.out.println("Is TV 1 switched on.");

System.out.println(tv1.getStatus());

System.out.println("Is TV 2 switched on.");

System.out.println(tv2.getStatus());

System.out.println("Turning on TV 1 ");

tv1.turnOn();

System.out.println("Turning on TV 2 ");

tv2.turnOn();

System.out.println("Checking channel no on TV 1 ");

System.out.println(tv1.getChannel());

System.out.println("Checking channel no on TV 2 ");

System.out.println(tv2.getChannel());

System.out.println("Checking volume level on TV 1 ");

System.out.println(tv1.getVolume());

System.out.println("Checking volume level on TV 2 ");

System.out.println(tv2.getVolume());

System.out.println("Is TV 1 swithced on. ");

System.out.println(tv1.getStatus());

System.out.println("Is TV 2 switched on. ");

System.out.println(tv2.getStatus());

System.out.println("Setting TV 1 to channel 0 ");

tv1.setChannel(0);

System.out.println(tv1.toString());

System.out.println("Setting TV 2 to channel 120 ");

tv2.setChannel(120);

System.out.println(tv2.toString());

System.out.println("Increasing channel no on TV 1 ");

tv1.channelUp();

System.out.println("Increasing channel no on TV 2 ");

tv2.channelUp();

System.out.println("Decreasing channel no on TV 1 ");

tv1.channelDown();

System.out.println("Decreasing channel no on TV 2 ");

tv2.channelDown();

System.out.println("Increasing volume on TV 1 ");

tv1.volumeUp();

System.out.println("Increasing volume on TV 2");

tv2.volumeUp();

System.out.println("Decreasing volume on TV 1 ");

tv1.volumeDown();

System.out.println("Decreasing volume on TV 2 ");

tv2.volumeDown();

System.out.println(tv1.toString() + "\n" + tv2.toString());

}

}

Code screenshot for Television class

Code screenshot for Test class

Sample output