Traffic Light Intersection Simulation UML: https://drive.google.com/file/d/1U0YeZdGE0koc1pUH35MT7z78EqhWiPkI/view?usp=sharing

This program simulates traffic scenarios at a four-way intersection by using objects for each entity involved at the traffic intersection.

Car - Class that controls car motion, interaction with a lane sensor, and which lane the car is in.

Car(Lane lane) - Constructor takes a lane object parameter and returns a car object

stop() - Orders the car to stop moving and prints where it stops by checking
    to see whether the light is green or red.

go() - Orders the car to leave the intersection and prints the direction it's
    going  by checking whether the light is green or red.

getTag() - Returns the direction of the lane.

getMotion() - Returns true or false if the car is in motion.

setMotion(boolean bool) - Set to true or false depending on whether the car
     is stopped or going.
     
getSensor() - Returns true or false depending on whether the car is on a sensor.

setSensor(boolean bool) - Sets onSensor to true or false when a car approaches
     or leaves an intersection.
     
getLane() - Returns the lane object.

setLane(Lane lane) - Sets the lane that the car is in.

CarList - An ArrayList class that keeps track of all cars at the intersection until they leave.

CarList() - Constructor initializes and ArrayList of type Car.

peek() - Returns first car element in the ArrayList.

remove() - Removes and returns the first car in the ArrayList.

add(Car c) - Adds Car object to the ArrayList.

setList(ArrayList list) - Initializes list.

advance() - Moves every car in the list 1 closer to head.

size() - Returns the length of the ArrayList.

Clock - Keeps a global clock by incrementing seconds, minutes and hours.

Clock() - Constructor initializing fields.

setSeconds(int sec) - Takes an int and adds seconds to clock.

setMinutes() - Updates minutes based on seconds.

setHours() - Updates hours based on minutes.

toString() - Converts ints to Strings and prints the updated time.

Controller - Controls traffic lanes by taking information from lanes's sensors and computing sequence to get all cars through the intersection.

Controller(Lane[] lanes) - Constructor takes set of lanes and initializes lanes array 
    to the one passed in and initialized laneWithCar to a null value.

lanesWithCar() - Finds which lanes currently have a car on their sensor and sets
    laneswithCar to the lanes that have a car in them.

sendcar(int laneToSend) - Sends cars on a specific lane by setting all other
    lanes to red, then this lane to green.

printLights() - Prints the current state of each lane's lights.

Lane - Initializes lanes with the direction they go.

Lane(char tag) - Takes parameter tag of the direction of the lane and initializes
    class objects.

carOnSensor() - Returns true or false depending on whether the car is on a sensor.

addCar(Car car) - Adds car object to ArrayList.

removeCar() - Calls remove() from CarList to remove the first car of ArrayList.

setLight(char color) - Changes traffic light's colors.

getLight() - Returns the color of the lights.

getTag() - Returns the direction of the lane.

printLight() - Prints the states of the traffic lights.

setTag(char tag) - Initializes the lane's direction.

getOppTag() - Returns the opposite lanes direction.

setOppTag() - Initializes the opposite lane's direction.

LightBulb - Class containing enumerated datatypes of traffic light bulbs.

getState() - returns true or false of whether a bulb is on or off.

setState(boolean state) - Sets light bulb on or off by whether it is true or false.

Sensor - Traffic lane sensor checks whether a car is present at the light.

Sensor(CarList l) - Constructor sets CarList object.

carPresent() - Checks first element of CarList to see if a car is present in lane.

getCarOnSensor() - Calls carPresent() to see if car is on sensor and returns true
    or false.

Simulator - Simulates traffic scenarios through class ojects.

main(String[] args) - Performs certain functions: run - No Car sim, 
    run1 - Eastbound Car, help - Prints again, quit - Exits program, 
    and Input Needed.

run1(String[] args) - Runs the scenario of a car approaching from eastbound lane
    by using class objects and their methods.

run(String[] args) - Runs the scenario with no cars at the intersection.

Timer - Class timing the traffic light operations of the intersection.

Timer(int s) - Constructor takes time in seconds the lights should run for.

getTime() - Returns amount of time to run light timer.

tick(int t) - Subtracts timer's seconds by the amount of seconds that have passed
    by the clock.
    
setTime(int sec) - Sets timer's time in seconds.

TrafficLight - Contains states of all traffic light's colors. Sends information to Controller and updates lights based on Controller.

BulbColor - Enum of three states representing the different light states.

TrafficLight() - Constructor default setting all lights to red.

TrafficLight(char color) - Takes first letter character of light color and
    sets the light bulb to that color.
    
getColor() - returns color of the bulb.

setColor(char color) - Sets the color of the traffic light bulb.

changeLights() - Sets and prints the traffic light state and 
    sets the other light bulbs to false. 

toString() - Returns a String for light bulb color.

Pedestrian - Pedestrian at a crosswalk for a lane at the intersection.

Pedestrian(String loc) - Returns a Pedestrian object with a direction set.

stop() - Orders Pedestrian to stop and prints which crosswalk lane they are
    stopped at.

go() - Orders Pedestrian to walk across the crosswalk.

getMotion() - Retuns true or false whether the pedestrian is in motion.

setMotion() - Sets motion to true or false whether the Pedestrian is walking.

getWait() - Returns true or false whether or not the Pedestrian is 
    at the crosswalk

setWait(boolean bool) - Sets wait to true or false whether the Pedestrian is
    in motion or not.

getLocation() - Returns a String that is the direction of the Pedestrian.