NullPointerException with defined array

Question

I have a method setColor, returning float[]. It always returns float array with size=3. When I use it like this:

 float[] color=setColor(0);
 content.setColor(Color.getHSBColor(color[0], color[1], color[2]));

there is a NullPointerException.

When I debug my program color[0], color[1], color[2] are defined, but it says that there is a NullPointerException.

How can I fix this?

Here is code of setColor

private float[] setColor (int colorID){
    float[]hsbValues=new float[3];
    if(colorID == 1){
        hsbValues =  Color.RGBtoHSB(0,255,255,hsbValues);
    }
    else if(colorID == 2){
        hsbValues =  Color.RGBtoHSB(255,0,255,hsbValues);
    }
    else if(colorID == 3){
        hsbValues =  Color.RGBtoHSB(0,255,0,hsbValues);
    }
    else if(colorID == 4){
        hsbValues =  Color.RGBtoHSB(255,255,0,hsbValues);
    }
    else if(colorID == 5){
        hsbValues =  Color.RGBtoHSB(255,0,0,hsbValues);
    }
    else if(colorID == 6){
        hsbValues =  Color.RGBtoHSB(255,255,255,hsbValues);
    }
    else{
        hsbValues =  Color.RGBtoHSB(0, 0, 0,hsbValues);
    }
    return hsbValues;
}

Here is constructor of class.

DrawOutput (MinDistances requiredMinDistances, MainMatrix matrix){
    super();
    getRequiredMedoidsArray(requiredMinDistances);
    paint(getGraphics(), requiredMinDistances, matrix);
}

getGraphics is null, Any suggestions?

with two code lines it's pretty difficult to get a correct answer for a NullPointer. — aran
– aran, Commented Apr 27, 2013 at 14:01

Maroun · Accepted Answer · 2013-04-27 14:03:58Z

2

This line can throw NPE if

color is null
content is null

If color is not null therefore check your content.

edited Apr 27, 2013 at 14:03

Maroun

96.4k30 gold badges195 silver badges249 bronze badges

answered Apr 27, 2013 at 13:59

AlexR

116k16 gold badges137 silver badges216 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Maroun Over a year ago

If the people who are downvoting because of context instead of content then this downvotes should be casted to upvotes.. +1 from me for correct answer with a small typo.

AlexR Over a year ago

@Luiggi Mendoza, I'd like to know PID of those people. Sometimes I'd enjoy to send them kill -9 :)

aran Over a year ago

I think the downvotes are origined by the "simplicity" of what he's asking and the vague way the OP has made the question. Just saying (didn't downvote).

Luiggi Mendoza · Accepted Answer · 2013-04-27 14:14:37Z

2

The content variable is null.

edited Apr 27, 2013 at 14:14

Luiggi Mendoza

85.9k16 gold badges160 silver badges355 bronze badges

answered Apr 27, 2013 at 14:00

Thierry

5,2533 gold badges27 silver badges30 bronze badges

4 Comments

Maroun Over a year ago

The is not an answer. It's a question.

AlexR Over a year ago

This is an answer grammatically composed as question.

Thierry Over a year ago

You are right, it's a question... The answer is "check the variable content"

Luiggi Mendoza Over a year ago

Please change the form of your question to be an answer (if I do it, that will be messing with your answer).

Adam Stelmaszczyk · Accepted Answer · 2013-04-27 14:12:52Z

0

Your NPE is in this line:

content.setColor(Color.getHSBColor(color[0], color[1], color[2]));

because content is null.

float array is always created here float[] hsbValues = new float[3] and since color[0], color[1], color[2] are float, they can't be null.

edited Apr 27, 2013 at 14:12

answered Apr 27, 2013 at 14:05

Adam Stelmaszczyk

19.9k4 gold badges73 silver badges111 bronze badges

3 Comments

a better oliver Over a year ago

coloris an array and can be null. In that case color[0] would throw a NPE.

Adam Stelmaszczyk Over a year ago

It can't, setColor() always returns an array object.

a better oliver Over a year ago

That's true, I just missed that you mentioned that in your answer :)

Collectives™ on Stack Overflow

NullPointerException with defined array

3 Answers 3

3 Comments

4 Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

3 Comments

4 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related