文件错误java对象编程

我需要有人帮忙。 我正在解决这个错误，即File无法解析为某个类型。 这是在文件文件=新文件（文件名）的底部; 不知道为什么。 请有人帮忙。

谢谢

import java.util.*; import java.awt.*; import javax.swing.*; import java.awt.event.*; //step 1 public class QuizPanel extends JPanel{ private ArrayListfileData = new ArrayList(); private ArrayListoneData = new ArrayList(); private ArrayListtwoData = new ArrayList(); private JButton submitButton; private JButton nextButton; private JButton levelOneButton; private JButton levelTwoButton; private JLabel question; private JLabel correctLabel = new JLabel(""); private JLabel correctAnswer = new JLabel(""); private JLabel ended = new JLabel(""); private JLabel responce = new JLabel(""); private JRadioButton [] options = { new JRadioButton (""), new JRadioButton (""), new JRadioButton (""), new JRadioButton (""),}; ButtonGroup optionsGroup = new ButtonGroup (); private int questionNumber = 0; private int score = 0; //Border Layout Panels private JPanel northPanel = new JPanel(); private JPanel eastPanel = new JPanel(); private JPanel southPanel = new JPanel(); private JPanel westPanel = new JPanel(); private JPanel centerPanel = new JPanel(); // constructor public QuizPanel(ArrayListfileData){ EventListener listener = new EventListener();//step 3 this.fileData = fileData; question = new JLabel(); submitButton = new JButton("Check Answer"); submitButton.addActionListener(listener);//step 4 nextButton = new JButton("Next Question"); nextButton.addActionListener(listener); levelOneButton = new JButton("Level One"); levelOneButton.addActionListener(listener); levelTwoButton = new JButton("Level Two"); levelTwoButton.addActionListener(listener); for (JRadioButton each:options){ optionsGroup.add(each); each.addActionListener(listener); centerPanel.add(each); } setLayout(new BorderLayout()); //North northPanel.setPreferredSize(new Dimension(400,65)); northPanel.setBackground(Color.black); northPanel.add(question); question.setVisible(false); question.setFont(new Font("Calibri",Font.BOLD,20)); question.setForeground(Color.white); add(northPanel,BorderLayout.NORTH); //East eastPanel.setPreferredSize(new Dimension(100,200)); eastPanel.setBackground(Color.green); eastPanel.add(submitButton); eastPanel.add(nextButton); nextButton.setVisible(false); add(eastPanel,BorderLayout.EAST); //South southPanel.setPreferredSize(new Dimension(400,65)); southPanel.setBackground(Color.black); correctLabel.setFont(new Font("Calibri",Font.BOLD,20)); correctLabel.setForeground(Color.white); southPanel.add(correctLabel); correctLabel.setVisible(false); ended.setFont(new Font("Calibri",Font.BOLD,20)); ended.setForeground(Color.white); southPanel.add(ended); ended.setVisible(false); add(southPanel,BorderLayout.SOUTH); //West westPanel.setPreferredSize(new Dimension(100,200)); westPanel.setBackground(Color.green); responce.setFont(new Font("Calibri",Font.BOLD,20)); westPanel.add(responce); responce.setVisible(false); westPanel.add(levelOneButton); westPanel.add(levelTwoButton); add(westPanel,BorderLayout.WEST); //Center centerPanel.setBackground(Color.green); centerPanel.setVisible(false); add(centerPanel,BorderLayout.CENTER); //set up outer panel colour and size setPreferredSize(new Dimension(700,350)); setBackground(Color.green); showQuestion(0);// show first question } //method for show Questions public void showQuestion(int questionNumber){ String newQuestion = fileData.get(questionNumber); System.out.println(newQuestion); String [] allQuestions = newQuestion.split("/"); question.setText(allQuestions[0]); for(int i = 1; i < allQuestions.length - 1; i++){ options[i-1].setText(allQuestions[i]); } correctAnswer.setText(allQuestions[allQuestions.length-1]); } // step 2 write an inner class private class EventListener implements ActionListener{ public void actionPerformed(ActionEvent e){ String level = " "; if(e.getSource() == levelOneButton){ String levelOne = "levelOne.txt"; readFile(levelOne, oneData); fileData = oneData; showQuestion(0); } else if (e.getSource() == levelTwoButton){ String levelTwo = "levelTwo.txt"; readFile(levelTwo, twoData); fileData = twoData; showQuestion(0); } int clicked = 0; boolean answered = false; if(e.getSource() == submitButton){ for(int i = 0; i < options.length; i++){ if(options[i].isSelected()){ clicked = i; answered = true; } } if(answered){ if(correctAnswer.getText().equals(options[clicked].getText())){ correctLabel.setText("Correct"); nextButton.setVisible(true); correctLabel.setVisible(true); submitButton.setVisible(false); score++; }else{ submitButton.setVisible(false); correctLabel.setVisible(true); nextButton.setVisible(true); String newQuestion = fileData.get(questionNumber); String [] allQuestions = newQuestion.split("/"); correctLabel.setText("Incorrect, Correct answer is " + allQuestions[5]); } } }else if (e.getSource() == nextButton){ submitButton.setVisible(true); nextButton.setVisible(false); correctLabel.setVisible(false); if(questionNumber < fileData.size() - 1){ //next question Button questionNumber++; optionsGroup.clearSelection(); correctAnswer.setText(""); showQuestion(questionNumber); }else{ submitButton.setVisible(false); nextButton.setVisible(false); question.setVisible(false); centerPanel.setVisible(false); ended.setVisible(true); ended.setText("Your score is " + score + "/3"); responce.setVisible(true); responce.setText("Thank you for taking the quiz, Your score is below."); } } } } public static void readFile(String filename, ArrayList fileData){ File file = new File(filename); try{ //instanitate a Scanner object to read from the object Scanner fileScan = new Scanner(file); //while there is another line yet to be read while(fileScan.hasNextLine()){ fileData.add(fileScan.nextLine()); //should manage exceptions - the String might not convert into a valid integer } }catch (FileNotFoundException e){ System.out.println("File not found"); System.exit(1); //exit from program if file not found } } } 

Answer 1

您在顶部缺少import语句。

 import java.io.*; 

Answer 2

你想试试这个： –

 import java.io.*; 

你错过了import声明。