Dirty paint

Question

Hello everybody.
I've coded a little programm which displays some figure when I click on a button. But I have a little problem with the "dirty painting".
here 's my code :
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.*;
import java.io.*;
public class Frame1 extends Frame implements ActionListener, WindowListener, AdjustmentListener {
     Canvas canvas1 = new java.awt.Canvas();
     JButton JButton1 = new JButton();
     JButton JButton2 = new JButton();
     JButton JButton3 = new JButton();
JButton JButton4 = new JButton();
JButton JButton5 = new JButton();
ScrollPane spane = new ScrollPane();
int dimXcanvas = 1000;
int dimYcanvas = 1000;
     int dimXSPane = 500;
     int dimYSPane = 280;
     public Frame1( String s){
     super(s);
          setLayout(null);
          spane.setBounds(50,50, dimXSPane, dimYSPane);
          canvas1.setBounds(0,0,dimXcanvas,dimYcanvas);
          spane.add(canvas1);
          add(spane);
          JButton1.setText("Carr�");
          add(JButton1);
          JButton1.setBounds(12,350,108,24);
          JButton2.setText("Cercle");
          add(JButton2);
          JButton2.setBounds(120,350,120,24);
          JButton3.setText("RecTextFleche");
          add(JButton3);
          JButton3.setBounds(240,350,108,24);
          JButton4.setText("Effacer");
          add(JButton4);
          JButton4.setBounds(360,350,108,24);
          JButton5.setBounds(480,350,108,24);
          JButton5.setText("Tout");
          add(JButton5);
          setTitle("A Simple Frame");
          JButton1.addActionListener(this);
          JButton2.addActionListener(this);
          JButton3.addActionListener(this);
          JButton4.addActionListener(this);
          JButton5.addActionListener(this);
          spane.getVAdjustable().addAdjustmentListener(this);
          spane.getHAdjustable().addAdjustmentListener(this);
     this.addWindowListener(this);
public void dessineCarre(int x, int y, int l, int h){
Graphics g = canvas1.getGraphics();
g.setColor(java.awt.Color.blue);
g.drawRect(x, y, l, h);
public void dessineCercle(int x, int y, int r1, int r2){
Graphics g = canvas1.getGraphics();
g.setColor(java.awt.Color.red);
g.drawOval(x, y, r1, r2);
public void dessineRect_Texte(int x, int y, int l, int h, String texte){
Graphics g = canvas1.getGraphics();
g.setColor(java.awt.Color.black);
g.drawRect(x, y, l, h);
g.drawString(texte, x+(l/4), (y+(h/2)));
g.dispose();
public void dessinefleche(int x, int y, int l){
Graphics g = canvas1.getGraphics();
g.setColor(java.awt.Color.black);
int[] XArray = {x-5, x, x+5, x, x};
int[] YArray = {y+10, y, y+10, y, y+l};
g.drawPolyline (XArray, YArray, 5);
public void dessineTout(){
Graphics g = canvas1.getGraphics();
//Cercle
g.setColor(java.awt.Color.red);
g.drawOval(180,500,100,100);
//Fl�che
g.setColor(java.awt.Color.black);
int[] XArray = {330-5, 330, 330+5, 330, 330};
int[] YArray = {20+10, 20, 20+10, 20, 120};
g.drawPolyline (XArray, YArray, 5);
//Carr�
g.setColor(java.awt.Color.blue);
g.drawRect(20,20,100,100);
//Rectangle Text
g.setColor(java.awt.Color.black);
g.drawRect(350,20,100,100);
g.drawString("coucou", 350+(100/4), (20+(100/2)));
public void efface(){
canvas1.repaint();
public void paint(Graphics g){}
     public void actionPerformed(ActionEvent e){
     if(e.getSource() == JButton1)
dessineCarre(20,20,100,100);
     else if(e.getSource()==JButton2)
     dessineCercle(180,20,100,100);
     else if(e.getSource()==JButton3)
     dessineRect_Texte(350,20,100,100,"Coucou");
     dessinefleche(330,20,100);
     else if(e.getSource()==JButton4)
     efface();
     else if(e.getSource()==JButton5)
     dessineTout();
     public void adjustmentValueChanged(AdjustmentEvent evt){
     dessineTout();
public void windowClosing(WindowEvent e){System.exit(0);}
public void windowActivated(WindowEvent e){}
public void windowDeactivated(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void windowOpened(WindowEvent e){}
What's wrong with this ?

Answer 1

My code :
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.*;
import java.io.*;
public class Frame1 extends Frame implements ActionListener, WindowListener, AdjustmentListener {
     Canvas canvas1 = new java.awt.Canvas();
     JButton JButton1 = new JButton();
     JButton JButton2 = new JButton();
     JButton JButton3 = new JButton();
    JButton JButton4 = new JButton();
    JButton JButton5 = new JButton();
    ScrollPane spane = new ScrollPane();
    int dimXcanvas = 1000;
    int dimYcanvas = 1000;
     int dimXSPane = 500;
     int dimYSPane = 280;
     public Frame1( String s){
         super(s);
          setLayout(null);
          spane.setBounds(50,50, dimXSPane, dimYSPane);
          canvas1.setBounds(0,0,dimXcanvas,dimYcanvas);
          spane.add(canvas1);
          add(spane);
          JButton1.setText("Carr�");
          add(JButton1);
          JButton1.setBounds(12,350,108,24);
          JButton2.setText("Cercle");
          add(JButton2);
          JButton2.setBounds(120,350,120,24);
          JButton3.setText("RecTextFleche");
          add(JButton3);
          JButton3.setBounds(240,350,108,24);
          JButton4.setText("Effacer");
          add(JButton4);
          JButton4.setBounds(360,350,108,24);
          JButton5.setBounds(480,350,108,24);
          JButton5.setText("Tout");
          add(JButton5);
          setTitle("A Simple Frame");
          JButton1.addActionListener(this);
          JButton2.addActionListener(this);
          JButton3.addActionListener(this);
          JButton4.addActionListener(this);
          JButton5.addActionListener(this);
          spane.getVAdjustable().addAdjustmentListener(this);
          spane.getHAdjustable().addAdjustmentListener(this);
         this.addWindowListener(this);
    public void dessineCarre(int x, int y, int l, int h){
        Graphics g = canvas1.getGraphics();        
        g.setColor(java.awt.Color.blue);       
        g.drawRect(x, y, l, h);          
    public void dessineCercle(int x, int y, int r1, int r2){
        Graphics g = canvas1.getGraphics();
        g.setColor(java.awt.Color.red);
        g.drawOval(x, y, r1, r2);
    public void dessineRect_Texte(int x, int y, int l, int h, String texte){
        Graphics g = canvas1.getGraphics();
        g.setColor(java.awt.Color.black);       
        g.drawRect(x, y, l, h);
        g.drawString(texte, x+(l/4), (y+(h/2)));
        g.dispose();
    public void dessinefleche(int x, int y, int l){
        Graphics g = canvas1.getGraphics();
        g.setColor(java.awt.Color.black);               
        int[] XArray = {x-5, x, x+5, x, x};
        int[] YArray = {y+10, y, y+10, y, y+l};
        g.drawPolyline (XArray, YArray, 5);
    public void dessineTout(){
        Graphics g = canvas1.getGraphics();
        //Cercle
        g.setColor(java.awt.Color.red);
        g.drawOval(180,500,100,100);
        //Fl�che 
        g.setColor(java.awt.Color.black);            
        int[] XArray = {330-5, 330, 330+5, 330, 330};
        int[] YArray = {20+10, 20, 20+10, 20, 120};
        g.drawPolyline (XArray, YArray, 5);
        //Carr�
        g.setColor(java.awt.Color.blue);       
        g.drawRect(20,20,100,100);
        //Rectangle Text
        g.setColor(java.awt.Color.black);       
        g.drawRect(350,20,100,100);
        g.drawString("coucou", 350+(100/4), (20+(100/2)));
    public void efface(){
        canvas1.repaint();
    public void paint(Graphics g){}
     public void actionPerformed(ActionEvent e){
         if(e.getSource() == JButton1)
            dessineCarre(20,20,100,100);
         else if(e.getSource()==JButton2)
            dessineCercle(180,20,100,100);
         else if(e.getSource()==JButton3)
             dessineRect_Texte(350,20,100,100,"Coucou");
             dessinefleche(330,20,100);
         else if(e.getSource()==JButton4)
             efface();
         else if(e.getSource()==JButton5)
             dessineTout();
      public void adjustmentValueChanged(AdjustmentEvent evt){
             dessineTout();
    public void windowClosing(WindowEvent e){System.exit(0);}
    public void windowActivated(WindowEvent e){}
    public void windowDeactivated(WindowEvent e){}
    public void windowIconified(WindowEvent e){}
    public void windowClosed(WindowEvent e){}
    public void windowDeiconified(WindowEvent e){}
    public void windowOpened(WindowEvent e){}
import java.io.*;
import java.util.*;
public class Lancement{
  public static void main(String targ[] ) throws IOException{
    Frame1 F = new Frame1("Dessins");
    F.setSize(600,400);
    F.pack();
    F.show();
}My problem : I lose the painting when I disable the window :(
How can I keep the painting in the canvas ?
Thank you for any help.