【发布时间】：2013-04-30 09:56:08
【问题描述】：
我需要这个简单的虚拟银行程序在每次启动时反序列化一个主账户。我已经这样做了，但是运行这个方法的 GUI 类继续给我一个java.lang.ClassNotFoundException。我不确定我的错误是什么或如何解决它，我该怎么办？我将在下面发布这两个类，因为我不确定在哪里可以找到错误。
BankGUI 类：
package GUIs;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridBagLayout;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ListSelectionModel;
import javax.swing.ScrollPaneConstants;
import javax.swing.UIManager;
import virtualBank3.BankAccount;
@SuppressWarnings("serial")
public class BankGUI implements Serializable {
BankAccount account;
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
BankGUI gui = new BankGUI();
gui.deserializeAccount();
gui.displayGUI();
}
// all global components for JFrame
JTextArea statusArea;
JCheckBox isLockedCheckBox;
JList depositAmount;
JList withdrawAmount;
JButton depositButton;
JButton withdrawButton;
JButton saveAccountButton;
private void displayGUI() {
JFrame frame = new JFrame("Virtual Bank v3.3");
Integer[] intList = { 1, 2, 5, 10, 20, 50, 100, 150, 250, 500 };
JPanel rightPanel = new JPanel();
rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.Y_AXIS));
rightPanel.setBackground(Color.GREEN);
JPanel centerPanel = new JPanel();
centerPanel.setBackground(Color.GREEN);
centerPanel.setLayout(new GridBagLayout());
frame.add(BorderLayout.CENTER, centerPanel);
frame.add(BorderLayout.EAST, rightPanel);
// add some JLabel's
JLabel depositAmountLabel = new JLabel("Deposit Amount:");
JLabel withdrawAmountLabel = new JLabel("Withdraw Amount:");
JLabel isLockedLabel = new JLabel("Lock account(True/False)");
// finish components(center panel)
statusArea = new JTextArea(15, 22);
statusArea.setEditable(false);
// add this to panel
isLockedCheckBox = new JCheckBox();
// add this to panel
// scrollers and Jlists
//***********************************************************************
depositAmount = new JList(intList);
JScrollPane scroller1 = new JScrollPane(depositAmount);
scroller1.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
scroller1.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
depositAmount.setVisibleRowCount(1);
depositAmount.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
withdrawAmount = new JList(intList);
JScrollPane scroller2 = new JScrollPane(depositAmount);
scroller2.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
scroller2.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
depositAmount.setVisibleRowCount(1);
depositAmount.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
//***********************************************************************
depositButton = new JButton("Deposit Amount.");
withdrawButton = new JButton("Withdraw Amount");
saveAccountButton = new JButton("Save your Account");
frame.setSize(425, 650);
frame.setVisible(true);
}
private void serializeAccount() {
try {
ObjectOutputStream objectStream1 = new ObjectOutputStream(
new FileOutputStream("bankAccounts.txt"));
objectStream1.writeObject(account);
objectStream1.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private void deserializeAccount() {
try {
ObjectInputStream objectStream2 = new ObjectInputStream(
new FileInputStream("bankAccounts.txt"));
account = (BankAccount) objectStream2.readObject();
objectStream2.close();
//test it
System.out.println("It worked.");
} catch (Exception e) {
e.printStackTrace();
}
}
}
BankAccount 类：
package virtualBank3;
import java.io.Serializable;
public class BankAccount implements Serializable {
private static final long serialVersionUID = -5341449653011848470L;
int balance = 0;
int userWallet = 0;
String owner = "Hello, world";
String accountStat = "Account Owner: " + owner + "\nAccount balance: $"
+ balance + "\nOwner Wallet Balance: $" + userWallet;
Boolean isLocked = false;
public int withdraw(int amount) {
balance -= amount;
userWallet += amount;
return userWallet;
}
public int deposit(int amount) {
balance += amount;
userWallet -= amount;
return balance;
}
public int depositCashIntoWallet(int amount) {
userWallet += amount;
return userWallet;
}
}
这是错误：
java.lang.ClassNotFoundException: virtualBank3.Account
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at java.io.ObjectInputStream.resolveClass(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at GUIs.BankGUI.deserializeAccount(BankGUI.java:123)
at GUIs.BankGUI.main(BankGUI.java:40)
【问题讨论】：
-
你能发布完整的堆栈跟踪吗？
-
将异常堆栈跟踪复制/粘贴为edit to the question。提供它们是有充分理由的！
-
virtualBank3 包下是否存在类 Account？
-
@HashSlingingHacker 您是否已将类名从 Account 更改为 BankAccount 并序列化数据？然后，当尝试重新读取序列化数据时，它正在寻找一个 Account 类（不再存在）。这可能吗？你在哪里有一个 virtualBank3.Account 类？
-
@HashSlingingHacker，正如 KPZ 所说，它在您的堆栈跟踪中。它正在反序列化您的数据，但会找到一个“Account.class”序列化对象。您已经更改了代码以使用 BankAccount，因此该类不再存在。我会删除所有序列化文件，以确保使用您的 BankAccount 类对其进行序列化。
标签： java swing serialization classnotfoundexception