Resizing ScrollPane and Dimension dynamically

Question

I am currently making a scrollbar program using ScrollPane and Dimension. I have to use those classes.
When I click "ok" button, that calls dc.enlarge(500,800) method. But it doesn't work.
When it is clicked, Dimension object should be changed and the panel has to show Horizotal
and Vertical scrollbar according to the width and height parameters.
Of course, the size will be calculated by the String contents object's rows and width. But it does not work.
How to resize the Dimension and How to display the Horizontal, Vertical scrollbar accoring to dc.enlarge's parameters?
Plz... help me...
-------------- ScrollerTest.java -----------------------------------------------
import java.awt.*;
import java.applet.Applet;
public class ScrollerTest extends Applet {
   public Scroller sc = null;
    public void init() {
        sc = new Scroller(700,250);
        sc.setVisible(true);
     add(sc);         
}-------------- Scroller.java -----------------------------------------------
import java.awt.*;
import java.awt.Window;
import java.applet.Applet;
import java.awt.event.*;
public class Scroller extends Panel implements  ActionListener {
    private Button btOk;   
    private int width = 0;
    private int height = 0;   
    private DrawCanvas dc;   
    public Scroller(int width, int height){   
        this.width = width;
        this.height = height;   
        dc = new DrawCanvas(width, height);
        setNewsContents();                           
    private void setNewsContents() {
        setLayout(new BorderLayout());
        ScrollPane scroller = new ScrollPane(ScrollPane.SCROLLBARS_AS_NEEDED);       
        scroller.add(dc);
        Adjustable vadjust = scroller.getVAdjustable();
        Adjustable hadjust = scroller.getHAdjustable();
        hadjust.setUnitIncrement(10);
        vadjust.setUnitIncrement(10);
        scroller.setSize(615     , 272);
        btOk = new Button("ok");
        btOk.addActionListener(this);
        add("Center", scroller);
        add("South", btOk);       
    public void actionPerformed(ActionEvent event) {
        if(event.getSource()==btOk) {
            dc.enlarge(500,800);
            dc.validate();
}    -------------- DrawCanvas.java -----------------------------------------------
import java.awt.*;
class DrawCanvas extends Component {
    private int width = 0;
    private int height = 0;
    private Dimension d;
    public DrawCanvas(int width, int height) {
        this.width = width;
        this.height = height;
   Dimension theSize = new Dimension(300, 200);   
   public Dimension getPreferredSize() {
        return new Dimension(width,height);               
   public void enlarge(int width, int height) {       
        theSize.width =  width;
        theSize.height = height;
        setSize(theSize);       
    public void update(Graphics g) {
        paint(g);
    public void paint(Graphics g) {       
        Rectangle r = getBounds();       
        String contents[] = {
        "addition to its usual stable of Clydesdale horses, the company will also enlist help this year ",
        "from racing star Dale Earnhardt Jr., some beer-thieving crabs and a scary hitchhiker.",       
        "The Super Bowl represents an enormous commitment for Budweiser. Bob Lachky, chief creative" ,
        "officer of Anheuser-Busch, said the St. Louis-based brewer has been advertising on the game since 1976 and has been the exclusive alcoholic beverage sponsor since 1989",
        "since 1976 and has been the exclusive alcoholic beverage sponsor since 1989, an arrangement that runs through 2012.",
        "It's important to us because it kicks off our selling season, it's the best platform",
        "possible to launch new ideas or to sustain existing campaigns, and it's absolutely the most efficient way to reach the most  it's absolutely the most efficient way to reach the most",
        "adult consumers in one sitting,",
        "Despite the rise of cable, the Internet other media to compete with broadcast television iewers and enticing a huge array of marketers ",
        ", the Super Bowl remains the most-viewed media event all year, drawing in some 90 million ",
        "viewers and enticing a huge array of marketers to pony up the big bucks for an ad",
        ", the price of which is running as high as $2.6 million for this year's broadcast",
        "on CBS Corp.'s CBS network, up slightly from about a top price of about $2.5 million last year.",
        "Comedian Carlos Mencia, of the Comedy Central show  gets ",
        "a big break with a spot set in a classroom. Lachky predicts that Mencia will get an enormous boost Lachky predicts that Mencia will get an enormous boost ",
        "following the appearance, which similarly did wonders for Cedric the Entertainer.",
        "And what would Budweiser Super Bowl ads be without some animated critters? This year, a ga",
        "ng of mischievous red crabs turn up on a beach to carry off a cooler full of beers. As in past years, Bud is keeping many ",
        g.setColor(new Color(226,250,255));
        g.fillRect(0, 0, r.width, r.height);
        g.setColor(new Color(233,231,224));            
        int line = 35;
        int line_1 = 39;
        for (int i = 0; i < contents.length; i++) {       
             g.setColor(Color.BLACK);
             g.drawString(contents, 5,line);
     g.setColor(new Color(233,231,224));
     g.drawLine(0,line_1,605,line_1);
     line += 20;
     line_1 += 20;

Answer 1

I am currently making a scrollbar program using ScrollPane and Dimension. I have to use those classes.
When I click "ok" button, that calls dc.enlarge(500,800) method. But it doesn't work.
When it is clicked, Dimension object should be changed and the panel has to show Horizotal
and Vertical scrollbar according to the width and height parameters.
Of course, the size will be calculated by the String contents object's rows and width. But it does not work.
How to resize the Dimension and How to display the Horizontal, Vertical scrollbar accoring to dc.enlarge's parameters?
Plz... help me...
-------------- ScrollerTest.java -----------------------------------------------
import java.awt.*;
import java.applet.Applet;
public class ScrollerTest extends Applet {
   public Scroller sc = null;
    public void init() {
        sc = new Scroller(700,250);
        sc.setVisible(true);
     add(sc);         
}-------------- Scroller.java -----------------------------------------------
import java.awt.*;
import java.awt.Window;
import java.applet.Applet;
import java.awt.event.*;
public class Scroller extends Panel implements  ActionListener {
    private Button btOk;   
    private int width = 0;
    private int height = 0;   
    private DrawCanvas dc;   
    public Scroller(int width, int height){   
        this.width = width;
        this.height = height;   
        dc = new DrawCanvas(width, height);
        setNewsContents();                           
    private void setNewsContents() {
        setLayout(new BorderLayout());
        ScrollPane scroller = new ScrollPane(ScrollPane.SCROLLBARS_AS_NEEDED);       
        scroller.add(dc);
        Adjustable vadjust = scroller.getVAdjustable();
        Adjustable hadjust = scroller.getHAdjustable();
        hadjust.setUnitIncrement(10);
        vadjust.setUnitIncrement(10);
        scroller.setSize(615     , 272);
        btOk = new Button("ok");
        btOk.addActionListener(this);
        add("Center", scroller);
        add("South", btOk);       
    public void actionPerformed(ActionEvent event) {
        if(event.getSource()==btOk) {
            dc.enlarge(500,800);
            dc.validate();
}    -------------- DrawCanvas.java -----------------------------------------------
import java.awt.*;
class DrawCanvas extends Component {
    private int width = 0;
    private int height = 0;
    private Dimension d;
    public DrawCanvas(int width, int height) {
        this.width = width;
        this.height = height;
   Dimension theSize = new Dimension(300, 200);   
   public Dimension getPreferredSize() {
        return new Dimension(width,height);               
   public void enlarge(int width, int height) {       
        theSize.width =  width;
        theSize.height = height;
        setSize(theSize);       
    public void update(Graphics g) {
        paint(g);
    public void paint(Graphics g) {       
        Rectangle r = getBounds();       
        String contents[] = {
        "addition to its usual stable of Clydesdale horses, the company will also enlist help this year ",
        "from racing star Dale Earnhardt Jr., some beer-thieving crabs and a scary hitchhiker.",       
        "The Super Bowl represents an enormous commitment for Budweiser. Bob Lachky, chief creative" ,
        "officer of Anheuser-Busch, said the St. Louis-based brewer has been advertising on the game since 1976 and has been the exclusive alcoholic beverage sponsor since 1989",
        "since 1976 and has been the exclusive alcoholic beverage sponsor since 1989, an arrangement that runs through 2012.",
        "It's important to us because it kicks off our selling season, it's the best platform",
        "possible to launch new ideas or to sustain existing campaigns, and it's absolutely the most efficient way to reach the most  it's absolutely the most efficient way to reach the most",
        "adult consumers in one sitting,",
        "Despite the rise of cable, the Internet other media to compete with broadcast television iewers and enticing a huge array of marketers ",
        ", the Super Bowl remains the most-viewed media event all year, drawing in some 90 million ",
        "viewers and enticing a huge array of marketers to pony up the big bucks for an ad",
        ", the price of which is running as high as $2.6 million for this year's broadcast",
        "on CBS Corp.'s CBS network, up slightly from about a top price of about $2.5 million last year.",
        "Comedian Carlos Mencia, of the Comedy Central show  gets ",
        "a big break with a spot set in a classroom. Lachky predicts that Mencia will get an enormous boost Lachky predicts that Mencia will get an enormous boost ",
        "following the appearance, which similarly did wonders for Cedric the Entertainer.",
        "And what would Budweiser Super Bowl ads be without some animated critters? This year, a ga",
        "ng of mischievous red crabs turn up on a beach to carry off a cooler full of beers. As in past years, Bud is keeping many ",
        g.setColor(new Color(226,250,255));
        g.fillRect(0, 0, r.width, r.height);
        g.setColor(new Color(233,231,224));            
        int line = 35;
        int line_1 = 39;
        for (int i = 0; i < contents.length; i++) {       
             g.setColor(Color.BLACK);
             g.drawString(contents, 5,line);
     g.setColor(new Color(233,231,224));
     g.drawLine(0,line_1,605,line_1);
     line += 20;
     line_1 += 20;