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Private member variables and generics - Netbeans doesn't like it?

 
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jcc153



Joined: 27 Sep 2008
Posts: 4
PostPosted: Wed Jan 27, 2010 6:14 pm    Post subject: Private member variables and generics - Netbeans doesn't like it? Reply with quote
The code below compiles and runs perfectly, but Netbeans complains about line 10 saying 'enginePower has private access in Car'. NetBeans is correct, but by my understanding this shouldn't be a problem?

Apologies for the contrived example!


Code:
public class Car<C extends Car> {

  private int enginePower;

  public Car(int enginePower) {
    this.enginePower = enginePower;
  }

  public boolean isCarBigger(C otherCar) {
    return otherCar.enginePower > enginePower;
  }


  public static void main(String[] args) {
    Car car1 = new SmallCar();
    Car car2 = new BigCar();

    if (car1.isCarBigger(car2)) {
      System.out.println("Car 2 is bigger than car 1");
    } else {
      System.out.println("Car 2 is smaller than car 1");
    }
  }
}

class SmallCar extends Car {
  public SmallCar() {
    super(5);
  }
}

class BigCar extends Car {
  public BigCar() {
    super(20);
  }
}



I'm running NetBeans v6.7.1 on Ubuntu with Java 1.6.0_16.

Cheers
--J
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Thomas Wolf
Posted via mailing list.
PostPosted: Wed Jan 27, 2010 6:45 pm    Post subject: Private member variables and generics - Netbeans doesn't like it? Reply with quote
Maybe I'm missing something obvious, but why do you have to use generics at all in this example? If you got rid of the "<C extends Car>" and changed isCarBigger(C otherCar) to isCarBigger(Car otherCar), do you still get the complaint from Netbeans?

tom

On 01/27/2010 01:14 PM, jcc153 wrote:
Quote:
Quote:
The code below compiles and runs perfectly, but Netbeans complains about line 10 saying 'enginePower has private access in Car'. NetBeans is correct, but by my understanding this shouldn't be a problem?

Apologies for the contrived example!



Code:
public class Car<C extends Car> {

private int enginePower;

public Car(int enginePower) {
this.enginePower = enginePower;
}

public boolean isCarBigger(C otherCar) {
return otherCar.enginePower > enginePower;
}


public static void main(String[] args) {
Car car1 = new SmallCar();
Car car2 = new BigCar();

if (car1.isCarBigger(car2)) {
System.out.println("Car 2 is bigger than car 1");
} else {
System.out.println("Car 2 is smaller than car 1");
}
}
}

class SmallCar extends Car {
public SmallCar() {
super(5);
}
}

class BigCar extends Car {
public BigCar() {
super(20);
}
}




I'm running NetBeans v6.7.1 on Ubuntu with Java 1.6.0_16.

Cheers
--J




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jcc153



Joined: 27 Sep 2008
Posts: 4
PostPosted: Wed Jan 27, 2010 7:15 pm    Post subject: Re: Private member variables and generics - Netbeans doesn't like it? Reply with quote
Hi Tom

No you're not missing anything! That contrived code snippet is just to reproduce the behaviour we're seeing with a much bigger project, based on the Assembly Line pattern and which uses generics to great effect. I appreciate the example code is a bit silly!

Ignoring the specifics of the code design for a moment, I think my question is more about whether NetBeans should be complaining at all when, by my understanding, it is valid Java code which compiles and runs correctly?


Thomas Wolf wrote:
Maybe I'm missing something obvious, but why do you have to use generics at all in this example? If you got rid of the "<C extends Car>" and changed isCarBigger(C otherCar) to isCarBigger(Car otherCar), do you still get the complaint from Netbeans?

tom
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Franz
Posted via mailing list.
PostPosted: Thu Jan 28, 2010 8:13 am    Post subject: Private member variables and generics - Netbeans doesn't like it? Reply with quote
Hello,

Am 27.01.2010 19:14, schrieb jcc153:
Quote:
The code below compiles and runs perfectly, but Netbeans complains about line 10 saying 'enginePower has private access in Car'. NetBeans is correct, but by my understanding this shouldn't be a problem?

I came across this some time ago as well (and it seems I wasn't the
first one). The answer you're looking for is here:
https://netbeans.org/bugzilla/show_bug.cgi?id=169907
https://netbeans.org/bugzilla/show_bug.cgi?id=163763

Regards
franz
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