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私はいくつかの大学ラボワークに取り組んでいます。Real.txtファイルはsrcディレクトリから読み込む必要があります。どの情報がtestEceptionsメソッドに渡されても、IOExceptionが発生します。それはおそらく単純なものですが、私の頭は大学の仕事の日から溶けています。srcディレクトリのjava読み込みファイルの問題
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.FileReader;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
public class TestFourExceptionsGUI extends JFrame
{
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable() {
public void run()
{
try {
TestFourExceptionsGUI frame = new TestFourExceptionsGUI();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public TestFourExceptionsGUI()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JButton btnTestIoexception = new JButton("Test IOException");
btnTestIoexception.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
System.out.println("I am here");
testExceptions("Hi", "Whatever.txt", "http://www.itb.ie", false);
}
});
btnTestIoexception.setBounds(115, 50, 180, 23);
contentPane.add(btnTestIoexception);
JButton btnTestUrlException = new JButton("Test Url Exception");
btnTestUrlException.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
testExceptions("", "Real.txt", "http://www.itb.ie", false);
}
});
btnTestUrlException.setBounds(115, 99, 180, 23);
contentPane.add(btnTestUrlException);
JButton btnTestNullpointerexception = new JButton("Test NullPointerException");
btnTestNullpointerexception.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
testExceptions("Hi", "Real.txt", "http://www.itb.ie", false);
}
});
btnTestNullpointerexception.setBounds(115, 152, 180, 23);
contentPane.add(btnTestNullpointerexception);
JButton btnGeneralException = new JButton("Test General Exception");
btnGeneralException.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
testExceptions("","Real.txt","http://www.itb.ie", true);
}
});
btnGeneralException.setBounds(115, 200, 180, 23);
contentPane.add(btnGeneralException);
}
private static final Object URL = null;
public void testExceptions(String str, String url, String filename, boolean generalexceptionActivated)
{
try {
str.toCharArray(); //Null string potential error
new FileReader(filename); //Unknown filename potential error
new URL(url); //Badly written URL potential error
if (generalexceptionActivated) { //Potential error
this.clone(); //Will be caught as a general error!
}
} catch (MalformedURLException e) {
JOptionPane.showMessageDialog(null, "A URL has been badly written " + e.getMessage(), null, JOptionPane.INFORMATION_MESSAGE);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "An IOException has been caught " + e.getMessage(), null, JOptionPane.INFORMATION_MESSAGE);
} catch (NullPointerException e) {
JOptionPane.showMessageDialog(null, "A NullPOinter Exception has been caught " + e.getMessage(), null, JOptionPane.INFORMATION_MESSAGE);
} catch (Exception e) {
JOptionPane.showMessageDialog(null, "A General Exception has been caught " + e.getMessage(), null, JOptionPane.INFORMATION_MESSAGE);
} finally {
JOptionPane.showMessageDialog(null, "The finally block has been called ", null, ERROR);
}
}
}
の例外がある:あなたの助けみんなのため
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: JOptionPane: type must be one of JOptionPane.ERROR_MESSAGE, JOptionPane.INFORMATION_MESSAGE, JOptionPane.WARNING_MESSAGE, JOptionPane.QUESTION_MESSAGE or JOptionPane.PLAIN_MESSAGE
を解決しました注文。このメソッドはstring、url、filenameを取りますが、文字列、filename、urlを与えているようです。 – hoipolloi
おかげさまhuipoloi私はそれが何か単純だったと思う – PaddyOTG