Why I do not see a static variable in a loop?
- by Roman
I have a static method which sets a variable:
static String[] playersNames;
public static void setParameters(String[] players) {
playersNames = players;
}
Then I have a static block:
static {
JRadioButton option;
ButtonGroup group = new ButtonGroup();
// Wright a short explanation of what the user should do.
partnerSelectionPanel.add(new JLabel("Pleas select a partner:"));
// Generate radio-buttons corresponding to the options available to the player.
// Bellow is the problematic line causing the null pointer exception:
for (String playerName: playersNames) {
final String pn = playerName;
option = new JRadioButton(playerName, false);
option.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent evt) {
partner = pn;
}
});
partnerSelectionPanel.add(option);
group.add(option);
}
partnerSelectionPanel.add(label);
// Add the "Submit" button to the end of the "form".
JButton submitButton = new JButton("Submit");
submitButton.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent evt) {
partnerSelected();
}
});
partnerSelectionPanel.add(submitButton);
}
Compiler does not complain about anything but when I try to execute the code I get problems. In this place SelectPartnerGUI.setParameters(players); I have:
Exception in thread "main"
java.lang.ExceptionInitializerError.
and it is cause by java.lang.NullpointerException at this place for (String playerName: playersNames).
Does my program do not see the palyersNames?
