autoshow.java

Java array and inheritance examples

import java.util.ArrayList;

import java.util.Iterator;
public class Autoshow { 
//These are the instance variables
private ArrayList<Car>  cars; 
//Here is the get method
public ArrayList<Car> getCars() { return cars; }

//Here is the constructor
public Autoshow() {
    cars = new ArrayList<Car>();
}

//This method returns a string representing the car
public String toString() {
    return ("Autoshow with " + cars.size() + " cars");
}

/*****************  2.1   ********************/

//This method adds a car to the Autoshow
public void addCar(Car aCar) { 
cars.add(aCar); 
} 
//This method returns the number of cars in the auto show
public int carCount() {
    return cars.size();
}

/*****************  2.2   ********************/
//This method returns a new ArrayList of cars with the given make
public ArrayList<Car> carsWithMake(String aMake) { 
ArrayList<Car>   result = new ArrayList<Car>();  

Iterator carsIterator = cars.iterator();
while(carsIterator.hasNext()){
	Car aCar = (Car) carsIterator.next();
	if(aCar.getMake().equals(aMake))
	result.add(aCar);
}


/*for (Car aCar: cars) {
    if (aCar.getMake().equals(aMake))
        result.add(aCar);
}*/
return result;

} 


/*****************  2.3   ********************/

//This method returns a new arrayList of the different car makes (no duplicates)
public ArrayList<String> differentMakes() { 
ArrayList<String>   result = new ArrayList<String>();  
for (Car aCar: cars) {
    if (!result.contains(aCar.getMake()))
        result.add(aCar.getMake());
}
return result;

} 


/*****************  2.4   ********************/


//This method returns the car with the maximum topSpeed
public Car fastestCar() { 
if (cars.isEmpty())
    return null; 
Car maxCar = cars.get(0);
for (Car aCar: cars){
    if (aCar.getTopSpeed() > maxCar.getTopSpeed())
        maxCar = aCar;
}
return maxCar;

} 


/*****************  2.5   ********************/


//This method returns the color that is most common
public String mostCommonColor() { 
String   maxColor = null;
int  maximum = 0;
for (Car searchCar: cars) { 
String searchColor = searchCar.getColor();
int  count = 0;
for (Car aCar: cars) { 
if (aCar.getColor().equals(searchColor)) 
count++; 
}
if (count > maximum) { 
maximum = count;
maxColor = searchColor; 
} 
}
return maxColor; 
} 

/*****************  2.6   ********************/


//This method prints out the cars in order of their top speed
public void printBySpeed() { 
//Copy the cars into a new ArrayList
ArrayList<Car>  carsCopy = new ArrayList<Car>(cars); 
  
//Now repeatedly find the car with maximum speed
while (!carsCopy.isEmpty()) { 
Car maxSpeedCar = carsCopy.get(0);
for (Car aCar: carsCopy) { 
if (aCar.getTopSpeed() > maxSpeedCar.getTopSpeed()) 
maxSpeedCar = aCar;
 
}
System.out.println(maxSpeedCar);
carsCopy.remove(maxSpeedCar); 
} 


} 


/*****************  2.7   ********************/


//This method prints out the cars in order of their make
public void printByMake() { 
//Copy the cars into a new ArrayList
ArrayList<Car>  carsCopy = new ArrayList<Car>(cars); 
  
//Now repeatedly find the car with least alphabetical order
while (!carsCopy.isEmpty()) { 
Car minMakeCar = carsCopy.get(0);
for (Car aCar: carsCopy) { 
if (aCar.getMake().compareTo(minMakeCar.getMake()) < 0) 
minMakeCar = aCar; 
}
System.out.println(minMakeCar);
carsCopy.remove(minMakeCar); 
} 
} 

}