有时间的请看看!我这个程序就是想实现在窗口中输入用户名和密码,然后再一个文本区域显示刚才输入的用户名和密码。
报错已经写在这里了:
Exception in thread "main" java.lang.NoClassDefFoundError: b (wrong name: practi
se/b)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: b. Program will exit.import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class b {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
TextComponentFrame frame = new TextComponentFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
class TextComponentFrame extends JFrame {
public TextComponentFrame() {
setTitle("TextComponentFrameTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
final JTextField textField = new JTextField();
final JPasswordField passwordField = new JPasswordField();
JPanel northPanel = new JPanel();
northPanel.setLayout(new GridLayout(2, 2));
northPanel.add(new JLabel("User name:", SwingConstants.RIGHT));
northPanel.add(textField);
northPanel.add(new JLabel("Password:"), SwingConstants.RIGHT);
northPanel.add(passwordField);
add(northPanel, BorderLayout.NORTH);
final JTextArea textArea = new JTextArea(8, 40);
JScrollPane scrollPane = new JScrollPane(textArea);
add(scrollPane, BorderLayout.CENTER);
JPanel southPanel = new JPanel();
JButton insertButton = new JButton("Insert");
southPanel.add(insertButton);
insertButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
textArea.append("User name:" + textField.getText()
+ "Password:"
+ new String(passwordField.getPassword() + "\n"));
}
});
add(southPanel, BorderLayout.SOUTH);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 300;
}
package practise;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class b {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
TextComponentFrame frame = new TextComponentFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
class TextComponentFrame extends JFrame {
public TextComponentFrame() {
setTitle("TextComponentFrameTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
final JTextField textField = new JTextField();
final JPasswordField passwordField = new JPasswordField();
JPanel northPanel = new JPanel();
northPanel.setLayout(new GridLayout(2, 2));
northPanel.add(new JLabel("User name:", SwingConstants.RIGHT));
northPanel.add(textField);
northPanel.add(new JLabel("Password:"), SwingConstants.RIGHT);
northPanel.add(passwordField);
add(northPanel, BorderLayout.NORTH);
final JTextArea textArea = new JTextArea(8, 40);
JScrollPane scrollPane = new JScrollPane(textArea);
add(scrollPane, BorderLayout.CENTER);
JPanel southPanel = new JPanel();
JButton insertButton = new JButton("Insert");
southPanel.add(insertButton);
insertButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
textArea.append("User name:" + textField.getText()
+ "Password:"
+ new String(passwordField.getPassword() + "\n"));
}
});
add(southPanel, BorderLayout.SOUTH);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 300;
}
报错已经写在这里了:
Exception in thread "main" java.lang.NoClassDefFoundError: b (wrong name: practi
se/b)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: b. Program will exit.import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class b {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
TextComponentFrame frame = new TextComponentFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
class TextComponentFrame extends JFrame {
public TextComponentFrame() {
setTitle("TextComponentFrameTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
final JTextField textField = new JTextField();
final JPasswordField passwordField = new JPasswordField();
JPanel northPanel = new JPanel();
northPanel.setLayout(new GridLayout(2, 2));
northPanel.add(new JLabel("User name:", SwingConstants.RIGHT));
northPanel.add(textField);
northPanel.add(new JLabel("Password:"), SwingConstants.RIGHT);
northPanel.add(passwordField);
add(northPanel, BorderLayout.NORTH);
final JTextArea textArea = new JTextArea(8, 40);
JScrollPane scrollPane = new JScrollPane(textArea);
add(scrollPane, BorderLayout.CENTER);
JPanel southPanel = new JPanel();
JButton insertButton = new JButton("Insert");
southPanel.add(insertButton);
insertButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
textArea.append("User name:" + textField.getText()
+ "Password:"
+ new String(passwordField.getPassword() + "\n"));
}
});
add(southPanel, BorderLayout.SOUTH);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 300;
}
package practise;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class b {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
TextComponentFrame frame = new TextComponentFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
class TextComponentFrame extends JFrame {
public TextComponentFrame() {
setTitle("TextComponentFrameTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
final JTextField textField = new JTextField();
final JPasswordField passwordField = new JPasswordField();
JPanel northPanel = new JPanel();
northPanel.setLayout(new GridLayout(2, 2));
northPanel.add(new JLabel("User name:", SwingConstants.RIGHT));
northPanel.add(textField);
northPanel.add(new JLabel("Password:"), SwingConstants.RIGHT);
northPanel.add(passwordField);
add(northPanel, BorderLayout.NORTH);
final JTextArea textArea = new JTextArea(8, 40);
JScrollPane scrollPane = new JScrollPane(textArea);
add(scrollPane, BorderLayout.CENTER);
JPanel southPanel = new JPanel();
JButton insertButton = new JButton("Insert");
southPanel.add(insertButton);
insertButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
textArea.append("User name:" + textField.getText()
+ "Password:"
+ new String(passwordField.getPassword() + "\n"));
}
});
add(southPanel, BorderLayout.SOUTH);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 300;
}
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