here is the code.... below is my problem.............
/*
<applet code="Assign2.class" width=350 height=350>
</applet>
*/
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
/*
Class Name - Assign2
PRIVATE FEATURES
private JButton buttons[] // array to store buttons
private String labels[] // array to stoer the department name
private JPanel thePanel; // JPanel object
private JMenu editMenu,optionsMenu; //JMenu objects for EDIT menu and OPTIONS menu
public JMenuItem items[] //array to store 'department name' menus inside EDIT menu
private JRadioButton options[] // array to store Color, Text, Hits options as radio buttons
private JMenuBar menubar; // MAIN MENU for the applet
private Color colors[] // array to hold colors the given colors
private final int max_bar_width // maximum width of a bar- set to 250, cna not be changed
private final int bar_height // maximum height of a bar
private int bar_width[] // array to store the bar widths for each department, can be changed by increasing the hits, 1 hit= 1 pixel
private int hits[]// array to store the number of hits for each department
private double percentage[] // array to store the number of percentage for each department
private int x_gap // x co-ordinate of each bar
private int y_gap / y co-ordinate of each bar
private int gap_between_bars // the height between each bar when displayed in the applet
private String stat // string that states the current status of the applet
private int option // helps to choose between the 3 options, "Color, Text, Hits"
// Color =0, Text=1, Hits= 2
private class MenuHandler // inner class to handle menus. Listens to menu events
private class OptionHandler // inner class to handle Options in option menu.Listens to option events
private class ButtonHandler // inner class to handle buttons. Listens to button events
PUBLIC FEATURES - Methods
# public void init() - Initializes the applet and draws the buttons and the menus
# public void paint()
# public void update()
# public void paintBars() - draws the horizontal bars for each department
# public void calculateChanges() - increases the number of hits,calculates the total no of hits and calculate the percentages
# public boolean isAlpha() - returns true or false. A method written to check if a given input string contains only characters
# public void showStatus() - Shows the current staus of the applet and used to diaply error message on the message bar of the applet
*/
public class Assign2 extends JApplet {
private JButton buttons[]=new JButton[5];
private String labels[]= {"Footwear","Kitchen Goods","Stationery","Music","Ladies Wear"};
private JPanel thePanel;
private JMenu editMenu,optionsMenu;
public JMenuItem items[]=new JMenuItem[5];
private JRadioButton options[]= new JRadioButton[3];
private JMenuBar menubar;
private Color colors[]= {Color.yellow,Color.red,Color.magenta,Color.cyan,Color.green};
private int max_bar_width=250;
private int bar_height= 25;
private int bar_width[]= {100,100,100,100,100};
private int hits[]= {200,200,200,200,200};
private double percentage[]={80.00,80.00,80.00,80.00,80.00};
private int x_gap= 15;
private int y_gap=35;
private int gap_between_bars=15;
private String stat= "Applet started!";
private int option=0;
public void init(){
Container pane = getContentPane();// returns the ContentPane
thePanel = new JPanel(); // creates panel object
thePanel.setLayout(null); // setting the layout for the panel
menubar = new JMenuBar(); // creating a menu bar object
setJMenuBar(menubar); // addind the menu bar to the applet
editMenu = new JMenu ("Edit");
menubar.add(editMenu); // adding a the EDIT menu to the menu bar
optionsMenu = new JMenu("Options"); // creating th OPTIONS menu
for (int i=0; i <5;i++) { // the for loop create a button for each dept, sets the colors, set the size and add the buttons to the panel
buttons[i]= new JButton(labels[i]);// creates a new button object
buttons[i].setBackground(colors[i]); // sets the color
buttons[i].setSize(115,30);// Sets the size
thePanel.add(buttons[i]);// add the button to the panel
buttons[i].addActionListener(new ButtonHandler()); // adding a listener object to listen to button events for each button
}
buttons[0].setLocation(0,260); // set button location
buttons[1].setLocation(115,260);
buttons[2].setLocation(230,260);
buttons[3].setLocation(0,290);
buttons[4].setLocation(115,290);
for (int i=0; i <5;i++) {
items[i]= new JMenuItem(labels[i]); // create each menu item and setting its label
editMenu.add(items[i]); // add the menu items to the EDIT menu
items[i].addActionListener(new MenuHandler()); //adding a listener object to listen to menu events
}
editMenu.add(optionsMenu); // adding the OPTIONS menu to the EDIT menu
ButtonGroup group = new ButtonGroup(); // creating a group to hold the 3 radio buttons for options
options[0]=new JRadioButton("Color"); // creating a radio button for COLOR option
options[0].setSelected(true); // setting the Color option to be selected as default
options[0].addActionListener(new OptionHandler()); // adding a listener object to listen to option events
options[1]=new JRadioButton("Text");// creating a radio button for TEXT option
options[1].setSelected(false);// setting the Text option to be unselected as default
options[1].addActionListener(new OptionHandler());// adding a listener object to listen to option events
options[2]=new JRadioButton("Hits");// creating a radio button for HITS option
options[2].setSelected(false);// setting the Hits option to be unselected as default
options[2].addActionListener(new OptionHandler());// adding a listener object to listen to option events
group.add(options[0]); // add options to the group
group.add(options[1]);
group.add(options[2]);
optionsMenu.add(options[0]); // add option radio buttons to the OPTIONS menu
optionsMenu.add(options[1]);
optionsMenu.add(options[2]);
pane.add(thePanel); // add the panel to the container
}
public void paint(Graphics g){
super.paint(g); // calls the components paint method
calculateChanges();
paintBars(g);
}
public void update(Graphics g){
paint(g);
}
public void paintBars(Graphics g){ // method that draws the bars
Graphics2D g2d = ( Graphics2D ) g; // creating a 2d graphics object
for (int i=0;i<5;i++) { //paint bars
g2d.setPaint( colors[i] ); // set the color for each bar
/* the filling area for each bar is calculated as follows
fill3DRect(int x, int y, int width, int height)
int x = x_gap ( the x co-ordinate of the bar)
int y= y co-ordinate of the bar + (bar height + the distance between 2 bars)* bar number
i.e ; for bar 1 ---> just the y co-ordinate
for bar 2 ----> y co_ordinate + (bar height of bar 1 + the distance betwen bar1 and bar2 ) * 1 etc
drawString (String message, int x, int y)
String message = No of hits and the Percentage for each department
int x = bar width of each dept + 10 pixels( for clarity)+ x -co-ordinate of bar position
int y = y co-ordinate of the bar + bar height(cos the string is dispalyed at the bottom of the bar)+ ( bar height + the distance between 2 bars)
i.e ; for bar 1 ---> just the y co-ordinate
for bar 2 ----> y co_ordinate + bar height of 1 +(bar height of bar 1 + the distance betwen bar1 and bar2 ) * 1 etc
*/
g2d.fill3DRect( x_gap , y_gap+((bar_height+gap_between_bars)*(i)), bar_width[i], bar_height, true);// Paints the rectangle filled with the current color.
g.drawString(hits[i] + ", " + percentage[i]+"%",bar_width[i]+x_gap+10,y_gap + bar_height + ((bar_height+gap_between_bars)*(i)));// prints the number of hits and precentage.
}
} // end of paintbars
public void calculateChanges(){// method that calculates the total no of hits and calculate the percentages
int total =0;// initialize total to 0
for(int i=0; i<5; i++) {
bar_width[i]=hits[i];// set hit=pixel
total += hits[i];
}//for
//calculating percentages
for (int i=0 ; i<5;i++) {
percentage[i]=(hits[i]*100.0) / total;
buttons[i].setText(labels[i]); // set label for button
buttons[i].setBackground(colors[i]); //set button background
items[i].setText(labels[i]); //set menu item labels
}// end for
}// end of calculatechanges
public boolean isAlpha(String str) {
//input: string, output: true/false
//Loops therough the character array and return false if invalid character found.
boolean blnAlpha = true;// define and initialize blnAlpha
char chr[] = null;// define char array and initialize to null
if(str != null)// check whether the string is null
chr = str.toCharArray();// break the string and insert into the chr array
for(int i=0; i<chr.length; i++) {
if((chr[i] < 'A' || chr[i] > 'Z') && (chr[i] < 'a' || chr[i] > 'z')){
if (!(chr[i]==' ')) { // check for space
blnAlpha = false;
//System.out.println(">>" + chr[i] + ">>"); // when debugging
}
}
}
return blnAlpha;
}//end isAlpha
//inner class to handle menus
private class MenuHandler implements ActionListener{
public void actionPerformed (ActionEvent event){
if (option==0){
for (int i=0; i<5;i++){
if(event.getSource()==items[i]){
Color c= JColorChooser.showDialog(Assign2.this, "Choose a color for " + labels[i],colors[i]);
if (c!=null){
colors[i] = c; //set new color to array
buttons[i].setBackground(c); //change button background color
repaint();
}//check for c being null
}//getsource
}//end for
}//enf of option==0
if (option==1){
for (int i=0; i <5; i++){
if(event.getSource()==items[i]){
String label = JOptionPane.showInputDialog(Assign2.this, "Edit Department Name - "
+ labels[i] ,"Department Name",1);
if(label!= null){
if(isAlpha(label)) {
labels[i]=label;
items[i].setText(label); //set menu label
buttons[i].setText(label); //set button label
repaint();
}
else{
showStatus("Make sure you've ONLY entered characters!!");
}//else
}//if
}// get source
}//for
}//end of option==1
if(option==2){
for(int i=0; i < 5; i++){
if(event.getSource()==items[i]){
try {
int h= Integer.parseInt (JOptionPane.showInputDialog(Assign2.this,"Edit Department Hits - " +
labels[i],"Department Hits",1));
if ((h<=250) && (h>0)) { //check for validity
hits[i] = h; //assign new value to hits array
calculateChanges();
repaint();
} else {
showStatus("Hits should be between 1 and 250!"); //show error
}
} catch(NumberFormatException e){
showStatus("You must input a number!!");
}
}// getting soure
}//end for
}//end of option==2
}//end of actionPerformed
}//end of MenuHandler
private class OptionHandler implements ActionListener {
// respond to checkbox events
public void actionPerformed( ActionEvent e )
{
//showStatus("Applet Running!");
if ( e.getSource() == options[0] ) { // option Color clicked
options[1].setSelected(false);
options[2].setSelected(false);
options[0].setSelected(true);
option = 0;
}
else if ( e.getSource() == options[1]) { //Option Text Clicked
options[1].setSelected(true);
options[2].setSelected(false);
options[0].setSelected(false);
option = 1;
}
else if ( e.getSource() == options[2] ) { //Option Hits Clicked
options[1].setSelected(false);
options[2].setSelected(true);
options[0].setSelected(false);
option = 2;
}
}//end action performed
} // OptionListner
class ButtonHandler implements ActionListener {
// respond to checkbox events
public void actionPerformed( ActionEvent e ) {
showStatus("Applet Running!");
for (int i=0;i<5;i++) {
if (e.getSource()==buttons[i]) { //loop until correct button is found
if (hits[i]>0 && hits[i] < max_bar_width) { //hits cant be more than 250
hits[i]++; //increment hits
calculateChanges(); //calculate new bar widths
repaint();
}else{
showStatus("Hits have to be between 1 and 250!"); //give error
}
}
}//end for
}//end action performed
} // ButtonHandler
public void showStatus(String Status) {
stat = Status;
getAppletContext().showStatus(stat);
}//end showStatus
} //end Assign2
here when you run the applet and click on the menu, its hidden Beneath the bars that are drawn. but once you click on a menu item and come back it works fine... what is the problem with the code ?? how can i fix this???
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