Java Community | Help. Code. Learn.•3y ago

Help with Interfaces, class, objects

38 Replies

public vehicles(String name, int maxPassangers, int topSpeed) { this should be constructor. Constructor name should be the same as the class name your class name is Vehicle rename constructor vehicles to Vehicle class Ship extends vehicles{ this should extend Vehicle, not vehicles

Unknown UserOP•3y ago

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Tomasm21•3y ago

yes

Unknown UserOP•3y ago

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Tomasm21•3y ago

ARe you sure save and check again

Unknown UserOP•3y ago

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Tomasm21•3y ago

what's the error

Unknown UserOP•3y ago

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Tomasm21•3y ago

vehicles is supposed to be an array, and not a variable right? Have you declared an array? Of type Vehicle

Unknown UserOP•3y ago

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Tomasm21•3y ago

yes this is it

Unknown UserOP•3y ago

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Tomasm21•3y ago

No. Array declaration should be in your Main class that has main method. Inside main method. Main class should import Vehicle and Ship classes, or be in the same package. And thus you can use it

Unknown UserOP•3y ago

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Tomasm21•3y ago

mmm I've never heard of it. Everywhere main is used

Unknown UserOP•3y ago

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Tomasm21•3y ago

Then try to declare an array outside the classes above and see And I've never used moodle

Unknown UserOP•3y ago

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Tomasm21•3y ago

Maybe we combined declaration and construction together. Now first, declare an array: Vehicle[] vehicles; and then later construct it: vehicles = new Vehicle[5]

Unknown UserOP•3y ago

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Tomasm21•3y ago

too bad sorry Are you taking an exam at the moment?

Unknown UserOP•3y ago

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Tomasm21•3y ago

Can you start from scratch?

Unknown UserOP•3y ago

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Tomasm21•3y ago

Are you risking of smth useful?

Unknown UserOP•3y ago

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Tomasm21•3y ago

Like can you close the moodle and open it again and start over

Unknown UserOP•3y ago

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Tomasm21•3y ago

Or if you drop it then you will not get points and teacher will set low mark First, declare an array: Vehicle[] vehicles; and then in next line construct it: vehicles = new Vehicle[5]

Unknown UserOP•3y ago

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Tomasm21•3y ago

yep You should also do this for real in Eclipse and see how it really works

Unknown UserOP•3y ago

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Tomasm21•3y ago

ahh so now with arraylist which is not just an array earlier you had to do this with just an array

Unknown UserOP•3y ago

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Tomasm21•3y ago

Tomasm21•3y ago

this is how it works with an array you had earlier

Unknown UserOP•3y ago

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Tomasm21•3y ago

yea

public class Main {

    public static void main(String[] args) {

        Vehicle[] vehicles;
        
        vehicles = new Vehicle[5];
                        //String name, int maxPassangers, int topSpeed , double displacement
        Vehicle titanic = new Ship("Titanic", 3327, 39, 52310);
                        //String name, int maxPassangers, int topSpeed, double weight
        Vehicle toyota = new Car("Toyota Avensis", 5, 200, 2.02);
                        
        Vehicle lambo = new Car("Lamborghini Gallardo", 2, 325, 1.485);
        
        Vehicle nimitz = new Ship("Nimitz", 5680, 58, 100020);
        
        Vehicle mazda3 = new Car("Mazda 3", 5, 190, 1.3);
        
        vehicles[0] = titanic;
        vehicles[1] = toyota;
        vehicles[2] = lambo;
        vehicles[3] = nimitz;
        vehicles[4] = mazda3;
        
        System.out.println(vehicles.length);
        
        for(int i = 0; i < vehicles.length; i++ ) {       
            System.out.println(vehicles[i].getName() + " - " + vehicles[i].getTopSpeed() + " - " + vehicles[i].getMaxPassangers());
        }        
    }
}

public class Main {

    public static void main(String[] args) {

        Vehicle[] vehicles;
        
        vehicles = new Vehicle[5];
                        //String name, int maxPassangers, int topSpeed , double displacement
        Vehicle titanic = new Ship("Titanic", 3327, 39, 52310);
                        //String name, int maxPassangers, int topSpeed, double weight
        Vehicle toyota = new Car("Toyota Avensis", 5, 200, 2.02);
                        
        Vehicle lambo = new Car("Lamborghini Gallardo", 2, 325, 1.485);
        
        Vehicle nimitz = new Ship("Nimitz", 5680, 58, 100020);
        
        Vehicle mazda3 = new Car("Mazda 3", 5, 190, 1.3);
        
        vehicles[0] = titanic;
        vehicles[1] = toyota;
        vehicles[2] = lambo;
        vehicles[3] = nimitz;
        vehicles[4] = mazda3;
        
        System.out.println(vehicles.length);
        
        for(int i = 0; i < vehicles.length; i++ ) {       
            System.out.println(vehicles[i].getName() + " - " + vehicles[i].getTopSpeed() + " - " + vehicles[i].getMaxPassangers());
        }        
    }
}

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