// class representing any machine that can be turned on and off
package interfaceexample;

public class Machine {
   protected boolean on;

   // constructors

    public Machine() {
        on = false;
    }


    // accessors and mutators

    public boolean getOn() {
        return on;
    }

    public void setOn(boolean on) {
        this.on = on;
    }



    // utilites

    @Override
    public String toString() {
        if(getOn()) {
            return "Machine is on";
        }
        return "Machine is off";
    }

    @Override
    // all machines are the same
    public boolean equals(Object obj) {
        if (obj != null && obj instanceof Machine) {
            return true;
        }
        return false;
    }

    // turn the machine on
    public void turnOn() {
        setOn(true);
    }

    // turn the machine off
    public void turnOff() {
        setOn(false);
    }

}