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分享大佬们，求救啊啊啊啊，这个IllegalArgumentException异常如何处理！！！
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;
public class QuizCardBuilder {
private JTextArea question;
private JTextArea answer;
private ArrayList<QuizCard> cardList;
private JFrame frame;
public void go() {
frame=new JFrame("Quiz Card Builder");
JPanel mainPanel=new JPanel();
Font bigFont =new Font("sanserif",Font.BOLD,24);
question =new JTextArea(6,20);
question.setLineWrap(true);
question.setWrapStyleWord(true);
question.setFont(bigFont);
JScrollPane qScroller=new JScrollPane(question);
qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
answer =new JTextArea(6,20);
answer =new JTextArea(6,20);
answer.setLineWrap(true);
answer.setWrapStyleWord(true);
answer.setFont(bigFont);
JScrollPane aScroller=new JScrollPane(answer);
aScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
aScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
JButton nextButton=new JButton("Next Card");
cardList=new ArrayList<QuizCard>();
JLabel qLabel=new JLabel("Question");
JLabel aLabel=new JLabel("Anwser");
mainPanel.add(qLabel);
mainPanel.add(qScroller);
mainPanel.add(aLabel);
mainPanel.add(aScroller);
mainPanel.add(nextButton);
nextButton.addActionListener(new NextCardListener());
JMenuBar menuBar=new JMenuBar();
JMenu fileMenu=new JMenu("File");
JMenuItem newMenuItem=new JMenuItem("New");
JMenuItem saveMenuItem=new JMenuItem("Save");
newMenuItem.addActionListener(new NewMenuListener());
saveMenuItem.addActionListener(new SaveMenuListener());
fileMenu.add(newMenuItem);
fileMenu.add(saveMenuItem);
menuBar.add(fileMenu);
frame.setJMenuBar(menuBar);
frame.getContentPane().add(BorderLayout.CENTER,mainPanel);
frame.setSize(500,600);
frame.setVisible(true);
}
public class NextCardListener implements ActionListener{
public void actionPerformed(ActionEvent ev) {
QuizCard card =new QuizCard(question.getText(),answer.getText());
cardList.add(card);
clearCard();
}
}
public class NewMenuListener implements ActionListener{
public void actionPerformed(ActionEvent ev) {
cardList.clear();
clearCard();
}
}
public class SaveMenuListener implements ActionListener{
public void actionPerformed(ActionEvent ev) {
QuizCard card =new QuizCard(question.getText(),answer.getText());
cardList.add(card);
JFileChooser fileSave =new JFileChooser();
fileSave.showSaveDialog(frame);
saveFile(fileSave.getSelectedFile());
}
}
private void clearCard() {
question.setText("");
answer.setText("");
question.requestFocus();
}
private void saveFile(File file) {
try {
BufferedWriter writer=new BufferedWriter(new FileWriter (file));
for(QuizCard card:cardList) {
writer.write(card.getQuestion()+"/");
writer.write(card.getQuestion()+"\n");
}
writer.close();
}catch(IOException ex) {
System.out.println("could't write the cardLIst out");
ex.printStackTrace();
}
}
public static void main(String[] args) {
QuizCardBuilder builder=new QuizCardBuilder();
builder.go();
}
public class QuizCard{
private int question;
private int answer;
public QuizCard(String text, String text2) {
}
public int getQuestion() {
int a;
a= question;
return a;
}
public int getAnswer() {
int b;
b=answer;
return b;
}
}
}
...全文
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qq_39936465 2020-01-19
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你在setVerticalScrollBarPolicy设定HORIZONTAL_SCROLLBAR_NEVER肯定报错啊！
要用setHorizontalScrollBarPolicy
三仙半 2020-01-19
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上面写的稍微有点问题，关键是你在qScroller和aScroller的滚动条设置存在相同的问题，嘿嘿
三仙半 2020-01-19
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你的代码中有如下3行
我估计第3行你是要设置水平滚动条，但是，你调用的方法是设置垂直滚动条，将它改为下面代码就好了
JScrollPane aScroller=new JScrollPane(answer);
aScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
aScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
我估计第3行你是要设置水平滚动条，但是，你调用的方法是设置垂直滚动条，将它改为下面代码就好了
qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
亲测有效！！！已解决java.lang.IllegalArgumentException异常，已解决java.lang.IllegalArgumentException异常的正确解决方法，亲测有效！！