returning an object


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Thread: returning an object

  1. #1
    Join Date
    Oct 2004
    Posts
    34

    returning an object

    Given the code below which adds weight to an object
    How can I create a method, NewTruckWeight() that will not change the state of the obj.
    Instead I want it to add pounds using the state of the current obj, instantiating and returning a new truck obj, without altering the state of the current obj?

    class TruckTest {
    public static void main(String[] args){
    Truck t1 = new Truck(5,125000);
    Truck t2 = new Truck(6,17000);

    //print the orginal weight of t1
    System.out.println(t1.getWeight());

    //call mutateWeight()
    t1.mutateWeight(1000);
    System.out.println(t1.getWeight());
    System.out.println(t2.getWeight());

    //here is the call NewTruckWeight(1000), I want to assign a new Truck reference to t2???

    }
    }

    class Truck {
    private int numaxles;
    private int weight;

    Truck(){
    };
    Truck(int axles, int w) {
    numaxles = axles;
    weight =w;
    }
    int getWeight() {
    return weight;
    }
    int getnumaxles() {
    return numaxles;
    }

    //add the mutateWeight()
    int mutateWeight(int i) {
    weight=(i + weight);
    return weight;
    }

    //add NewTruckWeight()???{

    }

    }
    Thanks, hope that is clear....

  2. #2
    Join Date
    Oct 2004
    Posts
    311
    In excense, what you need is to clone the old object...
    Their is an interface for this: Clone.

    If you look into this interface, it should set you on the right track.

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