现在我想知道你们是否可以帮我将ArrayList序列化到一个文件上。现在我正在从学校开始总结,但是我没有真正的编码问题。我正在制作的是一个GUI地址簿,当用户添加地址时,它会被存储到一个arraylist中并添加到comboBox中。这就是我在做的事情。我要问的是你是否可以序列化Arraylists。如果可以,你们可以教我怎么样?或者至少给我一些教程?
非常感谢你。如果你们在回答之前需要查看代码,请告诉我,我会告诉你。再次,非常感谢你。
好的,这是我的整个代码:
import java.awt.EventQueue;
public class Address_Book {
private JFrame frame;
private JTextField newName;
private JTextField newAddress;
private JTextField newPhoneAddress;
ArrayList<Book> test = new ArrayList<Book>();
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Address_Book window = new Address_Book();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Address_Book() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 371, 262);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
final JComboBox comboBox = new JComboBox();
final DefaultComboBoxModel model = new DefaultComboBoxModel();
newName = new JTextField();
newName.setBounds(10, 29, 79, 20);
frame.getContentPane().add(newName);
newName.setColumns(10);
JLabel lbl1 = new JLabel("Enter New Name:");
lbl1.setBounds(10, 11, 107, 14);
frame.getContentPane().add(lbl1);
JLabel lbl2 = new JLabel("Enter New Address:");
lbl2.setBounds(110, 11, 107, 14);
frame.getContentPane().add(lbl2);
newAddress = new JTextField();
newAddress.setColumns(10);
newAddress.setBounds(109, 29, 96, 20);
frame.getContentPane().add(newAddress);
newPhoneAddress = new JTextField();
newPhoneAddress.setColumns(10);
newPhoneAddress.setBounds(215, 29, 130, 20);
frame.getContentPane().add(newPhoneAddress);
JLabel lbl3 = new JLabel("Enter New Phone number:");
lbl3.setBounds(215, 11, 140, 14);
frame.getContentPane().add(lbl3);
JButton btnAddNewContact = new JButton("Add new contact");
btnAddNewContact.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent arg0) {
test.add( (new Book(newName.getText(), newAddress.getText(), newPhoneAddress.getText())));
//mergesort.mergesort(test, 0, test.size() - 1);
model.removeAllElements();
for(int i=0; i < test.size();i++){
model.addElement(test.get(i).getContact());
}
comboBox.setModel(model);
newName.setText("");
newAddress.setText("");
newPhoneAddress.setText("");
}
});
btnAddNewContact.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
btnAddNewContact.setBounds(10, 53, 335, 23);
frame.getContentPane().add(btnAddNewContact);
JLabel lbl4 = new JLabel("Current Contacts:");
lbl4.setBounds(10, 87, 107, 14);
frame.getContentPane().add(lbl4);
comboBox.setModel(model);
comboBox.setBounds(10, 101, 335, 20);
comboBox.setSelectedIndex(test.size()-1);
frame.getContentPane().add(comboBox);
}
}
这是我的对象:
public class Book implements Comparable {
private String flName, Address, pNumber;
public Book(String Name, String address, String phoneNumber ){
setFlName(Name);
setAddress(address);
setpNumber(phoneNumber);
}
public String getpNumber() {
return pNumber;
}
public void setpNumber(String pNumber) {
this.pNumber = pNumber;
}
public String getAddress() {
return Address;
}
public void setAddress(String address) {
Address = address;
}
public String getFlName() {
return flName;
}
public void setFlName(String flName) {
this.flName = flName;
}
public String getContact() {
return flName + " " + Address + " " + pNumber;
}
public int compareTo(Object c) {
Book testBook = (Book)c;
if (testBook.getFlName().compareTo(this.getFlName()) < 0){
return(-1);
}else if(testBook.getFlName().compareTo(this.getFlName()) == 0){
return(0);
}else{
return(1);
}
}
}
现在,再次,我不确定如何使Arraylists可序列化。我使用过对象,但没有使用Arraylists,因此我不知道它是否是同一个进程。我只是在寻求建议,或者是一些关于使ArrayLists可序列化的好教程。
答案 0 :(得分:4)
来自ArrayList
文档here:
所有已实施的接口: 可序列化,可克隆,可迭代,收集,列表,随机访问
是的,它是可序列化的。使用Java中的任何其他流非常简单,只需查看ObjectOutputStream
和ObjectInputStream
。
答案 1 :(得分:4)
使用ObjectInputStream
和ObjectOutputStream
,例如:
public static void saveArrayListToFile(ArrayList<Book> books, String filePath)
{
ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(filePath)));
oos.writeObject(books);
oos.close();
}
// ...
public static ArrayList<Book> loadArrayListFromFile(String filePath)
{
ObjectInputStream ois = new ObjectInputStream(new BufferedInputStream(new FileInputStream(filePath)));
try
{
return (ArrayList<Book>) ois.readObject();
}
finally
{
ois.close();
}
}
请注意Book
类必须实现Serializable
接口。我没有测试代码,但它应该工作。您可能需要尝试捕获上面代码中的任何异常。