Parking strategy pattern in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the ParkingStrategy interface.

LLD

public interface ParkingStrategy {
    boolean [1](Vehicle vehicle, ParkingLot lot);
}

Drag options to blanks, or click blank then click option'

AparkVehicle

BcanPark

CfindSpot

DreserveSpot

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names that imply parking action instead of checking.

The method canPark checks if a vehicle can be parked in the lot according to the strategy.

2fill in blank

medium

Complete the code to implement a strategy that parks only motorcycles.

LLD

public class MotorcycleParkingStrategy implements ParkingStrategy {
    @Override
    public boolean [1](Vehicle vehicle, ParkingLot lot) {
        return vehicle.getType() == VehicleType.MOTORCYCLE;
    }
}

Drag options to blanks, or click blank then click option'

AcanPark

BreserveSpot

CparkVehicle

DfindSpot

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names that do not match the interface.

The canPark method is overridden to allow parking only if the vehicle is a motorcycle.

3fill in blank

hard

Fix the error in the ParkingLot class method to use the strategy correctly.

LLD

public class ParkingLot {
    private ParkingStrategy strategy;

    public ParkingLot(ParkingStrategy strategy) {
        this.strategy = strategy;
    }

    public boolean [1](Vehicle vehicle) {
        if(strategy.canPark(vehicle, this)) {
            // park vehicle logic
            return true;
        }
        return false;
    }
}

Drag options to blanks, or click blank then click option'

AfindSpot

BcanPark

CreserveSpot

DparkVehicle

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the method the same as the strategy's check method.

The method parkVehicle is the correct name for parking a vehicle in the lot using the strategy.

4fill in blank

hard

Fill both blanks to complete the code for setting and using a parking strategy.

LLD

public class ParkingLot {
    private ParkingStrategy [1];

    public void setStrategy(ParkingStrategy [2]) {
        this.strategy = [2];
    }
}

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Astrategy

BparkStrategy

CnewStrategy

DparkingStrategy

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for field and parameter causing shadowing.

The field is named strategy and the method parameter is newStrategy to clearly distinguish them.

5fill in blank

hard

Fill all three blanks to complete the code for applying different parking strategies dynamically.

LLD

public class ParkingManager {
    private ParkingLot lot;

    public ParkingManager(ParkingLot lot) {
        this.lot = lot;
    }

    public void applyStrategy(ParkingStrategy [1]) {
        lot.[2]([3]);
    }
}

Drag options to blanks, or click blank then click option'

Astrategy

BsetStrategy

CapplyStrategy

DchangeStrategy

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names or mismatched parameter names.

The parameter is named strategy, the method called on lot is setStrategy, and the argument passed is strategy.