Serializing object to disc. Only retreives one object.
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Ok, I'll try again. This is my total code in a class that inherits from JFrame instantiated from main(). Slightly changed because I come from Sweden. So I enter the info in the textfield for title, author and price. If I enter the info for one book and then press "show books" it works. I enter another book and press show books again it still works. The textarea shows all books. If I enter a book and doesn't press "show books", enter a few others and then hit "show books" it only shows the last entered book. If I have entered a few books using the first method (enter book, press "show books", enter another book, press show books again)and then quits using the Close-button one books is saved, not more.
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.Border;
import javax.swing.border.EtchedBorder;/*
import java.awt.BorderLayout;
import java.awt.Color;*/import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;public class MainFrame extends JFrame implements ActionListener, MyContacts {
/\*\* \* \*/ private static final long serialVersionUID = 1L; public JTextField txtFieldTitle; private JTextField txtFieldAuthor; private JTextField txtFieldPrice; private JTextField txtFieldLanguage; private JTextArea ta1; private JButton btn; private JButton btn2; private JButton btnClose; private JButton btnRemove; private JRadioButton proRadio; private JRadioButton amateurRadio; private ButtonGroup playersBtnGroup; private ArrayList aList; //public ArrayList ProgrammingList; private JLabel txtTextArea; private JLabel txtTitle; private JLabel txtAuthor; private JLabel txtPrice; private Border redBorder = BorderFactory.createLineBorder(Color.red); public MainFrame(){ //Construktor super("Library"); setLayout(null); //Sätter storlek på fönstret. setSize(1200, 1000); //Hindra att fönstret kan ändras setResizable(false); setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE); setVisible(true); getCif(e.getSource() == btn) //add Book
{
String title = txtFieldTitle.getText();
// ...
book aBok = new book(title, anAuthor , thePrice);
aList = new ArrayList();
aList.add(aBok);
}//if source btn endEvery time you add a book you create a new
ArrayList(), so you are losing the previous books. You need to create your list at the beginning of the program and add to that as you enter more books. -
if(e.getSource() == btn) //add Book
{
String title = txtFieldTitle.getText();
// ...
book aBok = new book(title, anAuthor , thePrice);
aList = new ArrayList();
aList.add(aBok);
}//if source btn endEvery time you add a book you create a new
ArrayList(), so you are losing the previous books. You need to create your list at the beginning of the program and add to that as you enter more books. -
Ah, of course! Thank you, so simple :) So, again, thank you very much! So can I mark as solved or give you credit?
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You can upvote my answer if you like. But I do this as a hobby, so your message of thanks is enough.
Well, are very greatful. Don't really know how to upgrade, could you tell me? Also, I have another question and hope it is ok to ask it here. When I start the window it is blank or only a few items. When I minimize the window and maximaze it again, everything is fine. Do you know why this is?
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Well, are very greatful. Don't really know how to upgrade, could you tell me? Also, I have another question and hope it is ok to ask it here. When I start the window it is blank or only a few items. When I minimize the window and maximaze it again, everything is fine. Do you know why this is?
larsp777 wrote:
Don't really know how to upgrade, could you tell me?
Er, upgrade what?
larsp777 wrote:
When I start the window it is blank or only a few items.
Sounds like your startup code is not forcing all items to be painted; suggest you open a new question with all the details.
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larsp777 wrote:
Don't really know how to upgrade, could you tell me?
Er, upgrade what?
larsp777 wrote:
When I start the window it is blank or only a few items.
Sounds like your startup code is not forcing all items to be painted; suggest you open a new question with all the details.
I meant how can I upgrade your answer to give you credit :) Sure I can start a new question if you want. All I do though is call the class I shown in main like this: new MainFrame(); And then I inherit from the main window like: public class MainFrame extends JFrame implements ActionListener { So most code is in the constructor. So should I post a new question?
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I meant how can I upgrade your answer to give you credit :) Sure I can start a new question if you want. All I do though is call the class I shown in main like this: new MainFrame(); And then I inherit from the main window like: public class MainFrame extends JFrame implements ActionListener { So most code is in the constructor. So should I post a new question?
larsp777 wrote:
how can I upgrade your answer
Sorry, I misunderstood, as the word "upgrade" has a slightly different meaning. If you open any message and move your mouse just to the left of the text near the top, you should see two coloured arrows. A green one pointing up, and a red one pointing down. Click the green one to upvote the message, or the red one to downvote (means you think it is not a good message). As to your other problem, I think we need to see the code, so I suggest you open a new question.
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larsp777 wrote:
how can I upgrade your answer
Sorry, I misunderstood, as the word "upgrade" has a slightly different meaning. If you open any message and move your mouse just to the left of the text near the top, you should see two coloured arrows. A green one pointing up, and a red one pointing down. Click the green one to upvote the message, or the red one to downvote (means you think it is not a good message). As to your other problem, I think we need to see the code, so I suggest you open a new question.
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You can upvote my answer if you like. But I do this as a hobby, so your message of thanks is enough.
Whoa! before i thought i know Java but when i saw your code about serialization i realized i need to study more. I have never come across it. may be because I am just at intermediate level. your organization of class is what so much impress me about your codes. thank you so much. I wish I can get the complete source code for this.
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Whoa! before i thought i know Java but when i saw your code about serialization i realized i need to study more. I have never come across it. may be because I am just at intermediate level. your organization of class is what so much impress me about your codes. thank you so much. I wish I can get the complete source code for this.