用joptionpane在文本文件中进行Java搜索？

Question

Im really new to Java. So im quite lost here, im working on a project where i should search in a text file for a corresponding word, line by line. I got a little help from someone, but there´s some errors to the GUI in the joptionpane.

This is what i have until now. My GUI:

private void jMenuItemLookupActionPerformed(java.awt.event.ActionEvent evt) {                                                
    JOptionPane.showOptionDialog(null, "Title", "Message", 
    JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE,
    null, options.toArray(new String[] {}), options.get(0));
}

And my code for the search.

public String lookup(String question){
    List<String> options = new ArrayList<>();
    for (Object value : data.values()) {
    if (value.toString().startsWith(question)) {
        options.add((String) value);
    }
}

Answer 1

Move your List<String> options = new ArrayList<>(); outside the lookup method and make it a class variable. Your compiler cannot find options object.