Prototype pattern in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare the Prototype interface method for cloning.

LLD

interface Prototype {
    Prototype [1]();
}

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

AnewInstance

Bclone

Ccopy

Dduplicate

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names like copy or duplicate which are not standard in Prototype pattern.

Forgetting to return the Prototype type.

The standard method name for creating a copy in the Prototype pattern is clone().

2fill in blank

medium

Complete the code to implement the clone method in a concrete prototype class.

LLD

class ConcretePrototype implements Prototype {
    private int id;
    ConcretePrototype(int id) {
        this.id = id;
    }
    public Prototype [1]() {
        return new ConcretePrototype(this.id);
    }
}

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

Acopy

Bduplicate

Cclone

DnewInstance

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name than declared in the interface.

Not returning a new instance.

The clone() method returns a new instance copying the current object's state.

3fill in blank

hard

Fix the error in the clone method to correctly copy the object state.

LLD

public Prototype clone() {
    return new ConcretePrototype([1]);
}

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Anew id

Bid

Cprototype.id

Dthis.id

Attempts:

3 left

💡 Hint

Common Mistakes

Using undefined variables like prototype.id or new id.

Omitting 'this' causing ambiguity.

The clone method must use this.id to copy the current object's id.

4fill in blank

hard

Fill both blanks to create a prototype registry and clone an object from it.

LLD

class PrototypeRegistry {
    private Map<String, Prototype> prototypes = new HashMap<>();
    public void addPrototype(String key, Prototype prototype) {
        prototypes.put([1], [2]);
    }
    public Prototype getClone(String key) {
        return prototypes.get(key).clone();
    }
}

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

Akey

Bprototype

Cvalue

Dclone

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping key and prototype in the put method.

Using undefined variables.

Use key as the map key and prototype as the value to store the prototype object.

5fill in blank

hard

Fill all three blanks to clone a prototype and modify its state.

LLD

Prototype original = registry.getClone([1]);
ConcretePrototype copy = (ConcretePrototype) original;
copy.[2] = [3];

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

A"item1"

Bid

C42

Dclone

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect key strings.

Trying to call clone again instead of modifying the field.

Assigning a string to an integer field.

Clone the prototype with key "item1", then set its id to 42.