How can i make from a GUI application an Applet ?

Question

Hello, i have a gui appliction and i want to make an applet
how can i do that, i read an article (i need to put away method main and write method init (must be same as a constructer , but my constructor is only public Grafika() ) but it doest help....
Can you help me.. ?
import javax.swing.JFrame;
import java.awt.event.*;
import java.util.*;
import javax.swing.JPanel;
import java.awt.*;
import javax.swing.*;
public class Grafika{
     JPanel canvas;
     public static boolean pause = true;
     public static int algoritmus = 0;
     public static String[] algoritmy={"V�ber Algoritmu","QuickSort","BubbleSort"};
     public static long sleeper = 600;       
     public void borders(JPanel canvas,int[] cisla,int left,int right){
          Graphics g = canvas.getGraphics();
          for(int i=0;i<cisla.length;i++){               
               if(cisla==cisla[left]){
                    g.setColor(Color.lightGray);
                    g.drawLine(10, 20+i*4, 500,20+i*4 );
               if(cisla[i]==cisla[right]){
                    g.setColor(Color.lightGray);
                    g.drawLine(10, 20+i*4+1, 500,20+i*4+1 );
               else {
                    g.setColor(Color.white);
                    g.drawLine(10, 20+i*4-1, 500,20+i*4-1 );
          g.dispose();
          //repaint();          
     public void drawIt(JPanel canvas,int[] cisla,int pivot){
          Graphics g = canvas.getGraphics();
          for(int i=0;i<cisla.length;i++){     
               if(cisla[i]==pivot){
                    g.setColor(Color.green);
               else {
                    g.setColor(Color.red);
               g.fillRect(10, 20+i*4, cisla[i], 2);
               g.setColor(Color.white);
               g.fillRect(9+cisla[i]+1,20+ i*4, 1000, 2);
          g.dispose();
          //repaint();          
          public static void main(String[] Args){
          JFrame f = new JFrame("Triediace Algoritmy");     
          JPanel canvas = new JPanel();
          canvas.setBackground(Color.white);
          JButton sort = new JButton("Faster");
          JButton cancel = new JButton("Slower");
          sort.addActionListener(new ButtonListener());
          cancel.addActionListener(new ButtonListener());
          JComboBox algChooser = new JComboBox(algoritmy);
          algChooser.addActionListener(new ComboListener());
          JPanel controlPanel = new JPanel(new FlowLayout());
          controlPanel.add(algChooser);
          controlPanel.add(sort);
          controlPanel.add(cancel);
          canvas.setPreferredSize(new Dimension(200,200));
          // canvas.setBorder(BorderFactory.createLineBorder(Color.black));
          JPanel contentPane = new JPanel(new BorderLayout());
          // contentPane.setBounds(1, 1, 200, 200);
          contentPane.add(canvas,BorderLayout.CENTER);
          contentPane.add(controlPanel,BorderLayout.PAGE_END);
          // contentPane.setBorder(BorderFactory.createLineBorder(Color.red));
     f.addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
     System.exit(0);
     f.add(contentPane);
     f.pack();
     f.setSize(800,375);
     f.setVisible(true);
     int[] cisla = fillArray(70);
while (algoritmus == 0){
try{
     Thread.sleep(1);
}catch(InterruptedException ie){}
if (algoritmus == 1){
QuickSort qs = new QuickSort(canvas);
qs.sort(cisla);
if (algoritmus == 2){
BubbleSort bs = new BubbleSort(canvas);
bs.sort(cisla);
     public static int[] fillArray(int numbers){
          int temp=0;
          int[] arrayOfNumbers= new int[numbers];
          for (int i=0;i<numbers;i++){
               arrayOfNumbers[i] = i;
          for (int i=0;i<numbers;i++){
               Random generator = new Random();
               int left =generator.nextInt(numbers);
               int right =generator.nextInt(numbers);
               temp=arrayOfNumbers[left];
               arrayOfNumbers[left]=arrayOfNumbers[right];
               arrayOfNumbers[right]=temp;
          return arrayOfNumbers;
Thank you very much                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

//  <applet code="GrafikaApplet" width="400" height="400"></applet>
//  use: >appletviewer GrafikaApplet.java
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;
public class GrafikaApplet extends JApplet {
    String[] algoritmy={"V�ber Algoritmu","QuickSort","BubbleSort"};
    int algoritmus = 0;
    boolean running = false;
    GrafikaPanel canvas;
    int[] cisla;
    public void init() {
        cisla = fillArray(70);
        canvas = new GrafikaPanel(cisla);
        canvas.setPreferredSize(new Dimension(200,200));
       resize(800,375);
        Container cp = getContentPane();
        cp.add(canvas, BorderLayout.CENTER);
        cp.add(getControlPanel(), BorderLayout.PAGE_END);
    private int[] fillArray(int numbers){
        Random generator = new Random();
        int temp=0;
        int[] arrayOfNumbers= new int[numbers];
        for (int i=0;i<numbers;i++){
            arrayOfNumbers[i] = i;
        for (int i=0;i<numbers;i++){
            int left = generator.nextInt(numbers);
            int right = generator.nextInt(numbers);
            temp=arrayOfNumbers[left];
            arrayOfNumbers[left]=arrayOfNumbers[right];
            arrayOfNumbers[right]=temp;
        return arrayOfNumbers;
    private void startAnimation() {
        Thread thread = new Thread(new Runnable() {
            public void run() {
                switch(algoritmus) {
                    case 1:
                        new QuickSort2(canvas).sort(cisla);
                running = false;
        thread.setPriority(Thread.NORM_PRIORITY);
        thread.start();
    class ButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            if(!running) {
                running = true;
                algoritmus = 1;
                startAnimation();
    private JPanel getControlPanel(){
        JButton sort = new JButton("Faster");
        JButton cancel = new JButton("Slower");
        ButtonListener bl = new ButtonListener();
        sort.addActionListener(bl);
        cancel.addActionListener(bl);
        JComboBox algChooser = new JComboBox(algoritmy);
//        algChooser.addActionListener(new ComboListener());
        JPanel controlPanel = new JPanel(new FlowLayout());
        System.out.println("default layout for JPanel = " +
                            new JPanel().getLayout().getClass().getName());
        controlPanel.add(algChooser);
        controlPanel.add(sort);
        controlPanel.add(cancel);
        return controlPanel;
class GrafikaPanel extends JPanel {
   int[] cisla;
   int left;
   int right;
   int pivot;
    public GrafikaPanel(int[] cisla) {
        this.cisla = cisla;
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        for(int i=0;i<cisla.length;i++){               
            if(cisla==cisla[left]){
g.setColor(Color.lightGray);
g.drawLine(10, 20+i*4, 500,20+i*4 );
if(cisla[i]==cisla[right]){
g.setColor(Color.lightGray);
g.drawLine(10, 20+i*4+1, 500,20+i*4+1 );
else {
g.setColor(Color.white);
g.drawLine(10, 20+i*4-1, 500,20+i*4-1 );
for(int i=0;i<cisla.length;i++){     
if(cisla[i]==pivot){
g.setColor(Color.green);
else {
g.setColor(Color.red);
g.fillRect(10, 20+i*4, cisla[i], 2);
g.setColor(Color.white);
g.fillRect(9+cisla[i]+1,20+ i*4, 1000, 2);
public void drawIt(int[] cisla, int pivot){
this.cisla = cisla;
this.pivot = pivot;
repaint();
class QuickSort2{
GrafikaPanel component;
public QuickSort2(GrafikaPanel gp){
component = gp;
public void sort (int[] vstupnePole) {
QSort(vstupnePole,0,vstupnePole.length-1);
public void QSort(int[] array,int zac,int kon){
int i = zac;
int j = kon;
int pivot = array[(i+j)/2];
while(i<=j){
try {
Thread.sleep(100);
component.drawIt(array,pivot);          
}catch(InterruptedException ie){break;}
while(pivot<array[j]){j--;}
while(pivot>array[i]){i++;}
if (i<=j){
int temp = array[i];
array[i] = array[j];
array[j] = temp;
i++;
j--;
if (zac<j){QSort(array,zac,j);}
if (i<kon){QSort(array,i,kon);}