0

此方法应该将下一个问题加载到 GUI 中。

public void readNextEntry() {

    list = new ArrayList<String>();

    scanner = new Scanner(linesFromFile.get(currentQuestion)).useDelimiter(",|\n");
    for (int i = 0; i < 8; i++) {
        list.add(scanner.next());
    }
}

它应该加载的文本文件格式如下：

001,what color is the sky,it is blue because of precipitation,green,blue,yellow,red,a,   
002,What color are my eyes,they are blue if you look,blue,brown,green,black,a,    
003,What color is the water,it is blue because of water,green,blue,red,yellow,b,

为什么它不起作用？它应该加载类别 ( 001)、问题 ( what color is the sky?) 和它的选择 ( green,blue,yellow,red)。我的正则表达式关闭了吗？

编辑：一点上下文，这是完整的代码。到目前为止，一直在尝试来自该线程的建议，但没有成功。

package TestAssignment;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
import javax.swing.*;
import javax.swing.border.Border;

public class TestGui extends JFrame implements ActionListener {

private int counter = 0;
private int totalCount = 0;
private JTextArea question = new JTextArea();
private JTextArea recomendedAnswer = new JTextArea();
private JTextArea category = new JTextArea();
private ArrayList<String> list;
private ArrayList<String> linesFromFile;
private int currentQuestion = 0;
private ButtonGroup group = new ButtonGroup();
private ArrayList<JRadioButton> theButtons;
private JLabel response = new JLabel("");
private JButton answer = new JButton("Answer Question");
private Border border = BorderFactory.createLineBorder(Color.BLACK, 1);
private Scanner scanner;
private String fileName;

public void readNextEntry() {

    list = new ArrayList<String>();

    scanner = new Scanner(linesFromFile.get(currentQuestion)).useDelimiter(",|\n");
    for (int i = 0; i < 8; i++) {
        list.add(scanner.next());
    }
}

public void readFile() {
    linesFromFile = new ArrayList<String>();
    list = new ArrayList<String>();
    try {

        scanner = new Scanner(new File(fileName));
        while (scanner.hasNextLine()) {
            linesFromFile.add(scanner.nextLine());
        }
        Collections.shuffle(linesFromFile);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
}

public TestGui(String in) {

    setLayout(new GridLayout(11, 25));
    this.fileName = in;

    add(new JLabel("Category : "));
    JScrollPane scrollPane1 = new JScrollPane(category);
    category.setLineWrap(true);
    category.setBorder(border);
    add(scrollPane1);
    category.setEditable(false);

    //int randomNumber = (int) (Math.random() * 10) + 1;
    //String line = TestGui.readFileByLine("Questions.txt", randomNumber);

    add(new JLabel("Question: "));
    JScrollPane scrollPane2 = new JScrollPane(question);
    question.setLineWrap(true);
    question.setBorder(border);
    add(scrollPane2);
    question.setEditable(false);

    readFile();
    readNextEntry();

    add(new JLabel("Please Select the correct Answer"));

    theButtons = new ArrayList<JRadioButton>();

    for (int i = 0; i < 4; i++) {
        JRadioButton temp = new JRadioButton();
        theButtons.add(temp);
        add(temp);
        group.add(temp);
    }
    refreshButtonLabels();

    add(response);

    category.setText(list.get(0));
    question.setText(list.get(1));

    add(answer);

    answer.addActionListener(this);
   }

  public void refreshButtonLabels() {
    for (int i = 0; i < 4; i++) {
        theButtons.get(i).setText(list.get(i + 3));
    }
  }

    @Override
    public void actionPerformed(ActionEvent e) {
    if (e.getSource() == answer) {
        for (int i = 0; i < theButtons.size(); i++) {
            JRadioButton button = theButtons.get(i);
            if (button.isSelected() && list.get(7).equals("a")) {
                counter++;
                readNextEntry();
            }
            else if (button.isSelected() && list.get(7).equals("b")){
                counter++;
                readNextEntry();
            }
             else if (button.isSelected() && list.get(7).equals("c")){
                counter++;
                readNextEntry();
            }
             else if (button.isSelected() && list.get(7).equals("d")){
                counter++;
                readNextEntry();

            }
        }
    }
     else {
           readNextEntry();
          {
    }
    }





package TestAssignment;

import javax.swing.JFrame;


public class Test {
public static void main(String[] args) {
    TestGui test = new TestGui();
    test.setVisible(true);
    test.setSize(600, 600);
    test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}
}
4

2 回答 2

2

你会发现简单地用逗号分割字符串要容易得多：

String line = linesFromFile.get(currentQuestion);
String[] list = line.split(",\\s*");

扫描仪正在妨碍您。但是当你使用 Scanner 时，千万不要在没有nextXXX()先调用相关方法的情况下调用它的方法之一hasNextXXX()。例如：

while (scanner.hasNext())
{
  list.add(scanner.next());
}

如果使用得当，Scanner 绝不应该抛出 NoSuchElementException。

于 2012-11-24T02:36:41.047 回答
0

理论上这应该有效。令人困惑的事情是计算出仅在您的代码段中暗示的变量类型。

static List<String> linesFromFile = new ArrayList<String>();
static {
    linesFromFile.add("001,what color is the sky,it is blue because of precipitation,green,blue,yellow,red,a,");
    linesFromFile.add("002,What color are my eyes,they are blue if you look,blue,brown,green,black,a,");
    linesFromFile.add("003,What color is the water,it is blue because of water,green,blue,red,yellow,b,");
}

public static void main(String[] args) {
    List<String> list = new ArrayList<String>();

    Scanner scanner = new Scanner(linesFromFile.get(1)).useDelimiter(",|\n");
    for (int i = 0; i < 8; i++) {
        list.add(scanner.next());
    }
    System.out.println(Arrays.toString(list.toArray()));
}

印刷[002, What color are my eyes, they are blue if you look, blue, brown, green, black, a]

如果您已经将它们用行分隔，为什么还要用“\n”分隔？似乎其中一条线没有您期望的足够元素。您应该在获取单个元素（或仅调试它）之前尝试输出该行。

于 2012-11-24T01:06:19.980 回答