Background
On following screenshot, the user should be able to change the image by clicking on one of the radio buttons:
When a radio button is clicked the picture should change to a different one . I have put all images into an array.
Problem
When compiling code I have tried so far (see source below) the compiler gives following error:
Error: local variable
imagesLabelis accessed from within inner class; needs to be declared final
And once I add final before respective variable, I got following error when compiling:
Error: <identifier> expected
Java Code (after adding the final)
Icon[] images = new Icon[3];
// Get the images and store them in the images array. These images
// were manually resized to be similar in size prior to writing the
// program.
images[0] = new ImageIcon("/Users/grimygod/Desktop/negativeFilterExample.png");
images[1] = new ImageIcon("/Users/grimygod/Desktop/reflect.png");
images[2] = new ImageIcon("/Users/grimygod/Desktop/colorSubtraction.png");
// The images will be displayed as the image on a JLabel without text
JLabel imagesLabel = new JLabel();
// Set the initial image to be the negative filter, and add it to the panel,
// since the radio button for the negative filter is initially selected.
imagesLabel.setIcon(images[0]);
iconPanel.add(imagesLabel);
radioButtonPanel.add(iconPanel);
// Creation of "Select An Image & Apply Filter!" button
JButton selectButton = new JButton("Select An Image & Apply Filter!");
submitButtonPanel.add(selectButton);
radioButtonPanel.add(submitButtonPanel);
// Makes the whole window visible
testFrame.setVisible(true);
// First button is selected when program is ran
button1.setSelected(true);
button1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
final imagesLabel.setIcon(images[2]); // <<<<< ERROR in this line
}
});
You can do any of the following to resolve the issue:
A. Declare imagesLabel as final
final JLabel imagesLabel = new JLabel();
B. Declare imagesLabel as an instance variable i.e. outside the method. In other words, declare it in the class itself.
Make sure to remove final from final imagesLabel.setIcon(images[2]); i.e. it should be simply imagesLabel.setIcon(images[2]);