Java

ArrayList<Book> bList = (ArrayList<Book>) oistr.readObject();
oistr.close();
for (Book bb : bList) {
    bb.skrivUt();
    // ta1.append("Titel " + b.getTitle() + "\n");
    // ta1.append("Författare: " + b.getAuthor() + "\n");
    // ta1.append("Pris: " + Integer.toString(b.getPrice()) + "\n");
    // ta1.append("\n");
    }//foreach

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<book> aList;
	//public ArrayList<programmingBook> 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);
								 
		getContentPane().setBackground(Color.red);
		
		loadBook();
	
			
		//buttons
		btn = new JButton("Add book");
		btn.setBounds(120,70,200,20);
		add(btn);
		btn.addActionListener(this);
		
		btn2 = new JButton("Show books");
		btn2.setBounds(220,470,200,20);
		add(btn2);
		btn2.addActionListener(this); 
		
		btnClose = new JButton("Close");
		btnClose.setBounds(150,800,200,50);
		add(btnClose);
		btnClose.addActionListener(this); händelser
		
			
		
		//Textfields
		txtFieldTitle = new JTextField();
		txtFieldTitle.setBounds(570,70,200,20);
		add(txtFieldTitle);
		
		txtFieldAuthor = new JTextField();
		txtFieldAuthor.setBounds(570,110,200,20);
		add(txtFieldAuthor);
		
		txtFieldPrice = new JTextField();
		txtFieldPrice.setBounds(570,150,200,20);
		add(txtFieldPrice);
		
				
		
		//Textarea
		ta1 = new JTextArea();
		ta1.setBounds(720,470,400,420);
		ta1.setBorder(redBorder);
		add(ta1);
		
		
		
		//Labels
		txtTextArea = new JLabel("Böcker");
		txtTextArea.setBounds(720,430,200,20);
		add(txtTextArea);
		
		txtTitle = new JLabel("Titel");
		txtTitle.setBounds(500,70,200,20);
		add(txtTitle);
						
	}
	
public void actionPerformed(ActionEvent e) 	
{
				
	if(e.getSource() == btn) //add Book
	{
		String title = txtFieldTitle.getText();
	        String anAuthor = txtFieldAuthor.getText();
		String anPrice = txtFieldPrice.getText();
		String aLanguage = txtFieldLanguage.getText();
			
		int thePrice = Integer.parseInt(anPrice);
			
		book aBok = new book(title, anAuthor , thePrice);
		aList = new ArrayList<book>();
		aList.add(aBok);
	}//if source btn end
		
	if(e.getSource() == btn2) //Show books
	{
			for (book b : aList) {
		            ta1.append("Titel " + b.getTitle() + "\n");
		            ta1.append("Författare: " + b.getAuthor() + "\n");
		            ta1.append("Pris: " + Integer.toString(b.getPrice()) + "\n");
		            ta1.append("\n");
		         }
			
		}//if source btn2 end
		
		if(e.getSource() == btnClose)	//Close-button
		{
				saveBook(aList);
				System.exit(0);
		}
		
						
	}//ActionPerformed end
	
public void saveBook(ArrayList<book> aList)
{
    try
    {	
	FileOutputStream fil = new FileOutputStream("C:\\SavedObjects\\Objektfil.dat");
	ObjectOutputStream oostr = new ObjectOutputStream(fil);
	oostr.writeObject(aList);
	oostr.close();
    }
    catch (IOException e) 
    {
	System.out.println(e);
	System.out.println("Nu blev det visst fel i spara Bok");
    }
}//end saveBook	
	
@SuppressWarnings("unchecked")
public void loadBook()
{
	try
	{	
	   FileInputStream fil = new FileInputStream("C:\\SavedObjects\\Objektfil.dat");
	   ObjectInputStream oistr = new ObjectInputStream(fil);
	   aList = (ArrayList<book>) oistr.readObject();
	   oistr.close();
	}			
		
	catch (IOException e) 
	{
		System.out.println(e);
		System.out.println("Something went wrong in IO");
	}
		catch (ClassNotFoundException e)
		{
				System.out.println(e);
				System.out.println("Could not find class...");
		}
	}//end loadBook	
	
	
	
}

if(e.getSource() == btn) //add Book
{
    String title = txtFieldTitle.getText();
    // ...	
    book aBok = new book(title, anAuthor , thePrice);
    aList = new ArrayList<book>();
    aList.add(aBok);
}//if source btn end

larsp777 wrote:

Don't really know how to upgrade, could you tell me?

larsp777 wrote:

When I start the window it is blank or only a few items.

larsp777 wrote:

how can I upgrade your answer