Mixing
AWT-EventQueue-0 NullPointerException because of Graphics g initilisation
(I'm new here, sorry if I forget to write any important information).
I'm trying to visualise weather from the AccuWeather API and I am currently stuck with the initilisation of Graphics g, I think.
So this is my inilisation:
public class Draw extends JFrame {
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
Graphics g;
I tried Graphics g = new Graphics(); but that doesn't work because Graphics g is static.
this is a part of my paint method:
public void paint (Double weather, String sender, Graphics g) {
super.paint(g);
Toolkit tk = Toolkit.getDefaultToolkit();
if (sender.equals("index5_Button")) {
Graphics2D stargazing = (Graphics2D) g;
((Graphics2D) g).setBackground(Color.BLACK);
this is what the call for paint looks like:
paint(weatherValue, sender, g);
So obviously it isn't initilising g correctly, but I don't know how to fix it.
Thanks a lot for possible help in advance!
java swing graphics nullpointerexception graphics2d
edited Nov 19 '18 at 15:44
camickr
274k15126239
asked Nov 19 '18 at 15:20
3gg5y
61
add a comment |
(I'm new here, sorry if I forget to write any important information).
I'm trying to visualise weather from the AccuWeather API and I am currently stuck with the initilisation of Graphics g, I think.
So this is my inilisation:
public class Draw extends JFrame {
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
Graphics g;
I tried Graphics g = new Graphics(); but that doesn't work because Graphics g is static.
this is a part of my paint method:
public void paint (Double weather, String sender, Graphics g) {
super.paint(g);
Toolkit tk = Toolkit.getDefaultToolkit();
if (sender.equals("index5_Button")) {
Graphics2D stargazing = (Graphics2D) g;
((Graphics2D) g).setBackground(Color.BLACK);
this is what the call for paint looks like:
paint(weatherValue, sender, g);
So obviously it isn't initilising g correctly, but I don't know how to fix it.
Thanks a lot for possible help in advance!
java swing graphics nullpointerexception graphics2d
edited Nov 19 '18 at 15:44
camickr
274k15126239
asked Nov 19 '18 at 15:20
3gg5y
61
add a comment |
(I'm new here, sorry if I forget to write any important information).
I'm trying to visualise weather from the AccuWeather API and I am currently stuck with the initilisation of Graphics g, I think.
So this is my inilisation:
public class Draw extends JFrame {
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
Graphics g;
I tried Graphics g = new Graphics(); but that doesn't work because Graphics g is static.
this is a part of my paint method:
public void paint (Double weather, String sender, Graphics g) {
super.paint(g);
Toolkit tk = Toolkit.getDefaultToolkit();
if (sender.equals("index5_Button")) {
Graphics2D stargazing = (Graphics2D) g;
((Graphics2D) g).setBackground(Color.BLACK);
this is what the call for paint looks like:
paint(weatherValue, sender, g);
So obviously it isn't initilising g correctly, but I don't know how to fix it.
Thanks a lot for possible help in advance!
java swing graphics nullpointerexception graphics2d
edited Nov 19 '18 at 15:44
camickr
274k15126239
asked Nov 19 '18 at 15:20
3gg5y
61
(I'm new here, sorry if I forget to write any important information).
I'm trying to visualise weather from the AccuWeather API and I am currently stuck with the initilisation of Graphics g, I think.
So this is my inilisation:
public class Draw extends JFrame {
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
Graphics g;
I tried Graphics g = new Graphics(); but that doesn't work because Graphics g is static.
this is a part of my paint method:
public void paint (Double weather, String sender, Graphics g) {
super.paint(g);
Toolkit tk = Toolkit.getDefaultToolkit();
if (sender.equals("index5_Button")) {
Graphics2D stargazing = (Graphics2D) g;
((Graphics2D) g).setBackground(Color.BLACK);
this is what the call for paint looks like:
paint(weatherValue, sender, g);
So obviously it isn't initilising g correctly, but I don't know how to fix it.
Thanks a lot for possible help in advance!
java swing graphics nullpointerexception graphics2d
java swing graphics nullpointerexception graphics2d
edited Nov 19 '18 at 15:44
camickr
274k15126239
asked Nov 19 '18 at 15:20
3gg5y
61
edited Nov 19 '18 at 15:44
camickr
274k15126239
asked Nov 19 '18 at 15:20
3gg5y
61
edited Nov 19 '18 at 15:44
camickr
274k15126239
edited Nov 19 '18 at 15:44
camickr
274k15126239
edited Nov 19 '18 at 15:44
camickr
274k15126239
274k15126239
asked Nov 19 '18 at 15:20
3gg5y
61
asked Nov 19 '18 at 15:20
3gg5y
61
asked Nov 19 '18 at 15:20
3gg5y
61
61
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
I tried Graphics g = new Graphics();
You should not be trying to initialize the Graphics object of a component. Swing will create the Graphics object and pass it to the component when the component is repainted.
Custom painting is done by overriding the paintComponent(...) method of a JPanel. Then you add the panel to the JFrame`.
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
// add custom painting logic here
}
Read the section from the Swing tutorial on Custom Painting for more information and working examples to get you started. The tutorials will show you how to better structure your classes.
answered Nov 19 '18 at 15:42
camickr
274k15126239
add a comment |
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1 Answer
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1 Answer
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active
oldest
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active
oldest
votes
active
oldest
votes
I tried Graphics g = new Graphics();
You should not be trying to initialize the Graphics object of a component. Swing will create the Graphics object and pass it to the component when the component is repainted.
Custom painting is done by overriding the paintComponent(...) method of a JPanel. Then you add the panel to the JFrame`.
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
// add custom painting logic here
}
Read the section from the Swing tutorial on Custom Painting for more information and working examples to get you started. The tutorials will show you how to better structure your classes.
answered Nov 19 '18 at 15:42
camickr
274k15126239
add a comment |
I tried Graphics g = new Graphics();
You should not be trying to initialize the Graphics object of a component. Swing will create the Graphics object and pass it to the component when the component is repainted.
Custom painting is done by overriding the paintComponent(...) method of a JPanel. Then you add the panel to the JFrame`.
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
// add custom painting logic here
}
Read the section from the Swing tutorial on Custom Painting for more information and working examples to get you started. The tutorials will show you how to better structure your classes.
answered Nov 19 '18 at 15:42
camickr
274k15126239
add a comment |
I tried Graphics g = new Graphics();
You should not be trying to initialize the Graphics object of a component. Swing will create the Graphics object and pass it to the component when the component is repainted.
Custom painting is done by overriding the paintComponent(...) method of a JPanel. Then you add the panel to the JFrame`.
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
// add custom painting logic here
}
Read the section from the Swing tutorial on Custom Painting for more information and working examples to get you started. The tutorials will show you how to better structure your classes.
answered Nov 19 '18 at 15:42
camickr
274k15126239
I tried Graphics g = new Graphics();
You should not be trying to initialize the Graphics object of a component. Swing will create the Graphics object and pass it to the component when the component is repainted.
Custom painting is done by overriding the paintComponent(...) method of a JPanel. Then you add the panel to the JFrame`.
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
// add custom painting logic here
}
Read the section from the Swing tutorial on Custom Painting for more information and working examples to get you started. The tutorials will show you how to better structure your classes.
answered Nov 19 '18 at 15:42
camickr
274k15126239
answered Nov 19 '18 at 15:42
camickr
274k15126239
answered Nov 19 '18 at 15:42
camickr
274k15126239
answered Nov 19 '18 at 15:42
camickr
274k15126239
274k15126239
add a comment |
add a comment |
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