/*This is the way class is defined in Java:

class ClassName {

//variables

// methods

}

*/

class switch {

// instance variable

private boolean isOn;

// method

public void turnOn() {

isOn = true;

}

// method

public void turnOff() {

isOn = false;

}

}

//Here, class-"switch"

// instance variables-"isOn"

// methods-"turnOn , turnOff"