I am trying to make an object that has int in parameters, thats sends the value to another class, sets the value of the int to a private int in a constructor of another class and using the private int to set the size of an array, but i dosnt work... Does anyone know why? Below is an example of what i mean, i want to set the arrays size to 10.
main class: Car bmw = new Car(10);
Car class: public Car (int x)
{ y = x;}
private int y;
private String[] carArray= new String[y];
The problem with your code: private String[] carArray= new String[y]; will be executed before the constuctor body. In your case y will still be 0 (that's the default for primitive fields) which results in an array of length 0 being created.
Thus you'll have to do it like that:
public Car (int x) {
y = x;
carArray= new String[y];
}
Basically the call order is:
Example: assume we have class Car extends Vehicle.
If you call new Car(10) the call order might look like this (assuming there are no calls to other constructors:
Vehicle initializer blockVehicle constructorCar initializer blockCar constructorAn "initializer block" consists of everything that's in the class body but not part of a method (there actually are 2 initializer blocks: a static one and an instance one, the static one can be identified by the static keyword).
instead initialize the array in the constructor
main class: Car bmw = new Car(10);
private int y;
private String[] carArray=null;
Car class: public Car (int x)
{ y = x;
carArray= new String[y];
}
You have to initialize the Array inside your constructor:
public Car (int x) {
y = x;
carArray= new String[x];
}
