我试图制作一个简单的GUI程序，可用于在游戏中做出多种选择。我知道我必须采取所有问题，他们的选择和正确的答案。我的问题是，当我尝试在hashmap中收集正确的答案时，我只得到最后一个真正的答案，并且它在hashmap中重复。另外，我在收集选项时收到了一个问题并用一个不寻常的for循环解决了这个问题，但不幸的是我无法用答案做到这一点。
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.HashMap;
public class ExamFrame extends JFrame {
private ExamPanel examPanel;
private static int count = 1;
static HashMap<Integer,ArrayList<String>> choicesMap = new HashMap<>();
static ArrayList<String> choicesList = new ArrayList<>();
static HashMap<Integer,ArrayList<String>> truesMap = new HashMap<>();
static ArrayList<String> truesList = new ArrayList<>();
static ArrayList<String> prompts = new ArrayList<>();
public ExamFrame() {
super("Making exam");
examPanel = new ExamPanel();
setContentPane(examPanel);
setSize(700,600);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
class ExamPanel extends JPanel implements ActionListener{
private JLabel quLabel;
private JTextField questionField;
private ArrayList<JCheckBox> jCheckBoxes;
private ArrayList<JTextField> respnsesFields;
private JButton suivant,terminer;
private JPanel centerPanel;
public ExamPanel() {
centerPanel = new JPanel(new BorderLayout());
suivant = new JButton("next");
suivant.addActionListener(this);
terminer = new JButton("Finish");
terminer.setEnabled(false);
terminer.addActionListener(this);
layoutComponents();
}
public void layoutComponents() {
setBackground(Color.green);
setLayout(new BorderLayout());
JPanel prince = new JPanel(new GridBagLayout());
GridBagConstraints gc = new GridBagConstraints();
gc.fill = GridBagConstraints.NONE;
prince.setBackground(Color.CYAN);
gc.gridy = 0;
gc.weightx = 1;
gc.weighty = 0.1;
gc.insets = new Insets(0, 0, 0, 5);
gc.anchor = GridBagConstraints.LINE_END;
gc.gridx = 0;
quLabel = new JLabel("Question: ");
prince.add(quLabel,gc);
gc.gridx = 1;
gc.insets = new Insets(0, 0, 0, 0);
gc.anchor = GridBagConstraints.LINE_START;
questionField = new JTextField(45);
prince.add(questionField, gc);
jCheckBoxes = new ArrayList<>();
respnsesFields = new ArrayList<>();
for (int j = 0; j<2; j++) {
JCheckBox jCheckBox= new JCheckBox("Reponse "+(j+1));
jCheckBoxes.add(jCheckBox);
gc.gridy++;
gc.weightx = 1;
gc.weighty = 0.1;
gc.insets = new Insets(0, 0, 0, 5);
gc.anchor = GridBagConstraints.LINE_END;
gc.gridx=0;
prince.add(jCheckBox,gc);
JTextField jTextField = new JTextField(40);
respnsesFields.add(jTextField);
gc.gridx=1;
gc.insets = new Insets(0, 0, 0, 0);
gc.anchor = GridBagConstraints.LINE_START;
prince.add(jTextField,gc);
}
gc.gridy++;
gc.weightx = 1;
gc.weighty = 0.1;
gc.insets = new Insets(0, 0, 0, 5);
gc.anchor = GridBagConstraints.LINE_END;
gc.gridx=0;
prince.add(suivant,gc);
gc.gridx=1;
gc.insets = new Insets(0, 0, 0, 0);
gc.anchor = GridBagConstraints.LINE_START;
prince.add(terminer,gc);
centerPanel.add(prince,BorderLayout.CENTER);
add(centerPanel,BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
suivant.setEnabled(false);
if (count<=3) { //3 == Number of questions
suivant.setEnabled(true);
if (e.getSource() == suivant) {
String prompt = questionField.getText();
prompts.add(prompt);
ExamPanel.this.setVisible(false);
ExamFrame.this.setContentPane(new ExamPanel());
for (int i=0;i<2;i++) { //2 == Number of choices
choicesList.add(respnsesFields.get(i).getText());
}
for (int i=0;i<2;i++) {
if (jCheckBoxes.get(i).isSelected()) {
truesList.add(respnsesFields.get(i).getText());
}
}
truesMap.put(count,truesList);
truesList.clear();
count++;
}
}
else {
terminer.setEnabled(true);
questionField.setEnabled(false);
for (JTextField jTextField:respnsesFields) {
jTextField.setEnabled(false);
}
suivant.setEnabled(false);
if (e.getSource() == terminer) {
System.out.println(choicesList);
for (int i=0;i<3;i++) {
ArrayList<String> arrayList = new ArrayList<>();
for (int j=(i*2);j<(i+1)*2;j++) {
arrayList.add(choicesList.get(j));
}
choicesMap.put(i,arrayList);
}
System.out.println(choicesMap);
System.out.println(truesMap);
System.exit(0);
}
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new ExamFrame();
}
});
}
}
答案 0 :(得分：1)
您需要为放置在Map中的每个不同项目创建 new ArrayList。您的程序只有一个所有Map项共享的truesList ArrayList实例。在ActionListener的actionPerformed方法内部，创建新的ArrayList（如果你需要一个 - 如果你要创建一个新项目放入Map中），并将它与Integer键一起放入Map中。
如，
if (e.getSource() == suivant) {
truesList = new ArrayList<>(); // !! ADDED *****
String prompt = questionField.getText();
prompts.add(prompt);
ExamPanel.this.setVisible(false);
ExamFrame.this.setContentPane(new ExamPanel());
for (int i = 0; i < 2; i++) { // 2 == Number of choices
choicesList.add(respnsesFields.get(i).getText());
}
for (int i = 0; i < 2; i++) {
if (jCheckBoxes.get(i).isSelected()) {
truesList.add(respnsesFields.get(i).getText());
}
}
truesMap.put(count, truesList);
// !! truesList.clear(); // !! REMOVED ****
count++;
}
旁注：如果您使用的是Map<Integer, List<String>>，并且整数键字符串随着您的情况单调增加，为什么要使用地图呢？为什么不简单地使用嵌套列表？
List<List<String>> truesList = new ArrayList<>();
外部列表的索引与HashMap的Integer键相同。