CODEWITHSUNDEEP
java
Gerbrand de Groot
Gerbrand de Groot

Reputation: 21

What does Vehicle other = (Vehicle)obj; do?

I'm confused to what Vehicle other = (Vehicle)obj; does. Does it create a variable other and copies obj into it?

@Override
public boolean equals (Object obj) {
    if (this == obj) return true;
    if (!(obj instanceof Vehicle)) return false; 

    Vehicle other = (Vehicle)obj;
    return ( type.equals(other.type) 
            && size == other.size
            && uitstoot == other.uitstoot
           );
}

Upvotes: 1

Views: 92

Answers (3)

Josan
Josan

Reputation: 722

I think you are correct.

First it transform the Object obj to Vehicle class ( we already checked the obj could be transformed to Vehicle class, otherwise code couldn't go to here )

Second give the copy to the other variable in order to protect original data.

Upvotes: 0

Patricia Shanahan
Patricia Shanahan

Reputation: 26185

It does two things. It declares other to be a Vehicle reference, and it initializes it as a pointer to the object that is referenced by obj. The cast will never cause a runtime exception, because that object has already been determined to be a Vehicle.

Upvotes: 0

Svetlin Zarev
Svetlin Zarev

Reputation: 15683

First you check if the obj is instance of Vehicle

if (!(obj instanceof Vehicle)) return false;

If it is then it is cast to Vehicle class - i.e from that point onwards, it will be interpreted as Vehicle instance

Vehicle other = (Vehicle)obj;

Upvotes: 2

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