Vector // Serializable // Hiiiiilfe ;)
Von: , Frage gestellt am Do, 7. Dez 2006
hey :D
schreibe ein programm, was einfache formen zeichnen kann (ellipse,
rechteck, strich), diese formen aber als ganzes auch speichern und
laden können muss. soweit, so gut.
frage is nur, wie ich den Vector in der klasse flaeche Serializable
mache. hab versucht, eine eigene Serializable klasse myVector zu
schreiben die die Klasse Vector extendet. bekomm aber trotzdem noch
folgende exception:
java.io.NotSerializableException: java.util.Vector$1
quelltext folgt (sry wenns bissl viel is, weiss nich obs hier
erwünscht is, quelltexte auf ner nopaste-seite zu speichern):
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
/**
* @author Freddy Seubert
* @date 7.12.06
* @version 1.0
*
*/
public class MouseTest extends JPanel{
/**
* default serialversionuid for saving and loading
*/
private static final long serialVersionUID = 1L;
MenuBar menubar = new MenuBar(this);
Flaeche fl;
/**
* main method
* @param args not used
*/
public static void main(String[] args) {
JFrame frame = new JFrame("Maus-Test");
MouseTest myMouseTest = new MouseTest();
frame.getContentPane().add(myMouseTest);
frame.setJMenuBar(myMouseTest.menubar);
frame.setSize(400, 300);
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
} );
}
/**
* constructor of type MouseTest
*/
public MouseTest(){
setLayout(new BorderLayout());
fl = new Flaeche();
add(fl, BorderLayout.CENTER);
JPanel p = new JPanel();
JRadioButton oval = new JRadioButton("Oval", true);
JRadioButton rechteck = new JRadioButton("Rechteck");
JRadioButton linie = new JRadioButton("Linie");
ButtonGroup formen = new ButtonGroup();
formen.add(oval);
formen.add(rechteck);
formen.add(linie);
p.add(oval);
p.add(rechteck);
p.add(linie);
add(p, BorderLayout.SOUTH);
oval.addActionListener(fl);
rechteck.addActionListener(fl);
linie.addActionListener(fl);
}
/**
* opens a previously saved file for further drawing
*/
public void openFile(){
//System.out.println("testestetstetsttstststst"); funktioniert
JFileChooser chooser = new JFileChooser();
chooser.setMultiSelectionEnabled(false);
int option = chooser.showOpenDialog(null);
if(option == JFileChooser.APPROVE_OPTION){
File myFile = chooser.getSelectedFile();
try{
FileInputStream istream = new FileInputStream(myFile);
ObjectInputStream input = new ObjectInputStream
(istream);
System.out.println("loaded");
fl = (Flaeche) input.readObject();
this.repaint();
}catch(Exception e){
System.err.println(e.toString());
}
}
}
/**
* saves the drawings to a file for further working
*/
public void saveFile(){
JFileChooser chooser = new JFileChooser();
int option = chooser.showSaveDialog(null);
if(option == JFileChooser.APPROVE_OPTION){
File myFile = chooser.getSelectedFile();
try{
FileOutputStream ostream = new FileOutputStream
(myFile);
ObjectOutputStream output = new ObjectOutputStream
(ostream);
output.writeObject(fl);
System.out.println("saved");
}catch(Exception e){
System.err.println(e.toString());
}
}
}
/**
* clears the background on which you are painting
*/
public void clear(){
System.out.println("clear");
fl.clear();
this.repaint();
}
}
class MenuBar extends JMenuBar implements ActionListener{
/**
* default serialversionuid for saving and loading
*/
private static final long serialVersionUID = 1L;
MouseTest parent;
/**
* @param parent the "parent" MouseTest from where the MenuBar is
called
*/
public MenuBar(MouseTest parent){
super();
this.parent = parent;
JMenu menu1 = new JMenu("Datei");
JMenuItem neu = new JMenuItem("Neu");
JMenuItem open = new JMenuItem("Öffnen...");
JMenuItem save = new JMenuItem("Speichern...");
JMenuItem close = new JMenuItem("Beenden");
neu.addActionListener(this);
open.addActionListener(this);
save.addActionListener(this);
close.addActionListener(this);
menu1.add(neu);
menu1.add(open);
menu1.add(save);
menu1.addSeparator();
menu1.add(close);
this.add(menu1);
}
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
if(cmd.equals("Neu")){
parent.clear();
}else if(cmd.equals("Öffnen...")){
parent.openFile();
}else if(cmd.equals("Speichern...")){
parent.saveFile();
}else if(cmd.equals("Beenden")){
System.exit(0);
}
}
}
class Flaeche extends JPanel implements ActionListener,
java.io.Serializable{
/**
* serialversionuid for saving and loading
*/
private static final long serialVersionUID = 1L;
private MyVector v;
private int formwahl;
private Form form;
Enumeration enumer;
/**
* constructor (Flaeche)
*/
public Flaeche() {
formwahl = 1;
v = new MyVector();
form = new Form(0, 0, 0, 0, 0);
setBackground(Color.white);
addMouseListener(new MausTasten());
addMouseMotionListener(new MausBewegungen());
}
/**
*
*/
public void clear(){
v = new MyVector();
form = new Form(0, 0, 0, 0, 0);
enumer = null;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Form f;
enumer = v.elements();
while (enumer.hasMoreElements()) {
f = (Form)enumer.nextElement();
if (f.kz == 1)
g.drawOval(f.x, f.y, f.width, f.height);
else if (f.kz == 2)
g.drawRect(f.x, f.y, f.width, f.height);
else if (f.kz == 3)
g.drawLine(f.x, f.y, (f.x + f.width), (f.y +
f.height));
}
if (form.width > 0 && form.height > 0)
if (form.kz == 1)
g.drawOval(form.x, form.y, form.width, form.height);
else if (form.kz == 2)
g.drawRect(form.x, form.y, form.width, form.height);
else if (form.kz == 3)
g.drawLine(form.x, form.y, (form.x + form.width),
(form.y + form.height));
}
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
if (cmd.equals("Oval"))
formwahl = 1;
else if (cmd.equals("Rechteck"))
formwahl = 2;
else if (cmd.equals("Linie"))
formwahl = 3;
}
class MausTasten extends MouseAdapter {
public void mousePressed(MouseEvent e) {
form = new Form(formwahl, e.getX(), e.getY(), 0, 0);
}
public void mouseReleased(MouseEvent e) {
if (form.width > 0 && form.height > 0)
v.addElement(form);
}
}
class MausBewegungen extends MouseMotionAdapter {
public void mouseDragged(MouseEvent e) {
int x = e.getX();
int y = e.getY();
if (x > form.x && y > form.y) {
form.width = x - form.x;
form.height = y - form.y;
}
repaint();
}
}
}
class Form implements java.io.Serializable{
/**
* bla standard serialVersionUID for saving and loading
*/
private static final long serialVersionUID = 1L;
public int kz, x, y, width, height;
/**
* @param kz
* @param x
* @param y
* @param width
* @param height
*/
public Form(int kz, int x, int y, int width, int height){
this.kz = kz;
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
}
class MyVector extends Vector implements java.io.Serializable{
/**
* bla for saving and loading
*/
private static final long serialVersionUID = 1L;
MyVector(){
super();
}
}