package vijay;
/**
*
* @author VIJAY
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SubKillerWithScore extends JPanel
/**
*
* @author VIJAY
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SubKillerWithScore extends JPanel
{
public static void main(String[] args)
public static void main(String[] args)
{
JFrame window = new JFrame("Sub Killer Game");
SubKillerWithScore content = new SubKillerWithScore();
window.setContentPane(content);
window.setSize(600, 480);
window.setLocation(100,100);
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setResizable(false); // User can't change the window's size.
window.setVisible(true);
}
//------------------------------------------------------------------------
private Timer timer; // Timer that drives the animation.
private int width, height;
private Boat boat; // The boat, bomb, and sub objects are defined
private Bomb bomb; // by nested classes Boat, Bomb, and Submarine,
private Submarine sub; // which are defined later in this class.
private int hits; // The number of times the user has hit the sub.
private int misses; // The number of times the user has missed the sub.
private Font infoFont = new Font("Monospaced", Font.PLAIN, 16);
// A font for displaying the numbers of hits and misses.
JFrame window = new JFrame("Sub Killer Game");
SubKillerWithScore content = new SubKillerWithScore();
window.setContentPane(content);
window.setSize(600, 480);
window.setLocation(100,100);
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setResizable(false); // User can't change the window's size.
window.setVisible(true);
}
//------------------------------------------------------------------------
private Timer timer; // Timer that drives the animation.
private int width, height;
private Boat boat; // The boat, bomb, and sub objects are defined
private Bomb bomb; // by nested classes Boat, Bomb, and Submarine,
private Submarine sub; // which are defined later in this class.
private int hits; // The number of times the user has hit the sub.
private int misses; // The number of times the user has missed the sub.
private Font infoFont = new Font("Monospaced", Font.PLAIN, 16);
// A font for displaying the numbers of hits and misses.
public SubKillerWithScore()
{
setBackground( new Color(0,200,0) );
ActionListener action = new ActionListener()
setBackground( new Color(0,200,0) );
ActionListener action = new ActionListener()
{
// Defines the action taken each time the timer fires.
public void actionPerformed(ActionEvent evt)
// Defines the action taken each time the timer fires.
public void actionPerformed(ActionEvent evt)
{
if (boat != null)
if (boat != null)
{
boat.updateForNewFrame();
bomb.updateForNewFrame();
sub.updateForNewFrame();
}
repaint();
}
};
timer = new Timer( 30, action ); // Fires every 30 milliseconds.
addMouseListener( new MouseAdapter()
boat.updateForNewFrame();
bomb.updateForNewFrame();
sub.updateForNewFrame();
}
repaint();
}
};
timer = new Timer( 30, action ); // Fires every 30 milliseconds.
addMouseListener( new MouseAdapter()
{
// The mouse listener simply requests focus when the user
// clicks the panel.
public void mousePressed(MouseEvent evt)
// The mouse listener simply requests focus when the user
// clicks the panel.
public void mousePressed(MouseEvent evt)
{
requestFocus();
}
} );
addFocusListener( new FocusListener()
requestFocus();
}
} );
addFocusListener( new FocusListener()
{
public void focusGained(FocusEvent evt)
public void focusGained(FocusEvent evt)
{
timer.start();
repaint();
}
public void focusLost(FocusEvent evt)
timer.start();
repaint();
}
public void focusLost(FocusEvent evt)
{
timer.stop();
repaint();
}
} );
addKeyListener( new KeyAdapter()
timer.stop();
repaint();
}
} );
addKeyListener( new KeyAdapter()
{
public void keyPressed(KeyEvent evt)
public void keyPressed(KeyEvent evt)
{
int code = evt.getKeyCode();
if (code == KeyEvent.VK_LEFT)
int code = evt.getKeyCode();
if (code == KeyEvent.VK_LEFT)
{
boat.centerX -= 15;
}
else if (code == KeyEvent.VK_RIGHT)
boat.centerX -= 15;
}
else if (code == KeyEvent.VK_RIGHT)
{
boat.centerX += 15;
}
else if (code == KeyEvent.VK_DOWN)
boat.centerX += 15;
}
else if (code == KeyEvent.VK_DOWN)
{
if ( bomb.isFalling == false )
bomb.isFalling = true;
}
}
} );
} // end constructor
public void paintComponent(Graphics g) {
super.paintComponent(g); // Fill panel with background color, green.
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
if (boat == null) {
width = getWidth();
height = getHeight();
boat = new Boat();
sub = new Submarine();
bomb = new Bomb();
}
if (hasFocus())
g.setColor(Color.CYAN);
else {
g.setColor(Color.BLACK);
g.drawString("CLICK TO ACTIVATE", 20, height - 10);
g.setColor(Color.GRAY);
}
g.drawRect(0,0,width-1,height-1); // Draw a 3-pixel border.
g.drawRect(1,1,width-3,height-3);
g.drawRect(2,2,width-5,height-5);
boat.draw(g);
sub.draw(g);
bomb.draw(g);
g.setFont(infoFont);
g.setColor(Color.BLACK);
g.drawString("Number of hits: " + hits, 15, 24);
g.drawString("Number of misses: " + misses, 15, 45);
} // end paintComponent()
if ( bomb.isFalling == false )
bomb.isFalling = true;
}
}
} );
} // end constructor
public void paintComponent(Graphics g) {
super.paintComponent(g); // Fill panel with background color, green.
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
if (boat == null) {
width = getWidth();
height = getHeight();
boat = new Boat();
sub = new Submarine();
bomb = new Bomb();
}
if (hasFocus())
g.setColor(Color.CYAN);
else {
g.setColor(Color.BLACK);
g.drawString("CLICK TO ACTIVATE", 20, height - 10);
g.setColor(Color.GRAY);
}
g.drawRect(0,0,width-1,height-1); // Draw a 3-pixel border.
g.drawRect(1,1,width-3,height-3);
g.drawRect(2,2,width-5,height-5);
boat.draw(g);
sub.draw(g);
bomb.draw(g);
g.setFont(infoFont);
g.setColor(Color.BLACK);
g.drawString("Number of hits: " + hits, 15, 24);
g.drawString("Number of misses: " + misses, 15, 45);
} // end paintComponent()
private class Boat {
int centerX, centerY; // Current position of the center of the boat.
Boat() { // Constructor centers the boat horizontally, 80 pixels from top.
centerX = width/2;
centerY = 80;
}
void updateForNewFrame() { // Makes sure boat has not moved off screen.
if (centerX < 0)
centerX = 0;
else if (centerX > width)
centerX = width;
}
void draw(Graphics g) { // Draws the boat at its current location.
g.setColor(Color.BLUE);
g.fillRoundRect(centerX - 40, centerY - 20, 80, 40, 20, 20);
}
} // end nested class Boat
int centerX, centerY; // Current position of the center of the boat.
Boat() { // Constructor centers the boat horizontally, 80 pixels from top.
centerX = width/2;
centerY = 80;
}
void updateForNewFrame() { // Makes sure boat has not moved off screen.
if (centerX < 0)
centerX = 0;
else if (centerX > width)
centerX = width;
}
void draw(Graphics g) { // Draws the boat at its current location.
g.setColor(Color.BLUE);
g.fillRoundRect(centerX - 40, centerY - 20, 80, 40, 20, 20);
}
} // end nested class Boat
private class Bomb {
int centerX, centerY; // Current position of the center of the bomb.
boolean isFalling;
Bomb() { // Constructor creates a bomb that is initially attached to boat.
isFalling = false;
}
void updateForNewFrame() { // If bomb is falling, take appropriate action.
if (isFalling) {
if (centerY > height) {
isFalling = false;
misses++; // USER HAS MISSED THE SUB
}
else if (Math.abs(centerX - sub.centerX) <= 36 &&
Math.abs(centerY - sub.centerY) <= 21) {
sub.isExploding = true;
sub.explosionFrameNumber = 1;
isFalling = false; // Bomb reappears on the boat.
hits++; // USER HAS HIT THE SUB
}
else {
centerY += 10;
}
}
}
void draw(Graphics g) { // Draw the bomb.
if ( ! isFalling ) {
centerX = boat.centerX;
centerY = boat.centerY + 23;
}
g.setColor(Color.RED);
g.fillOval(centerX - 8, centerY - 8, 16, 16);
}
} // end nested class Bomb
private class Submarine {
int centerX, centerY; // Current position of the center of the sub.
boolean isMovingLeft; // Tells whether the sub is moving left or right
boolean isExploding; // Set to true when the sub is hit by the bomb.
int explosionFrameNumber;
Submarine() { // Create the sub at a random location 40 pixels from bottom.
centerX = (int)(width*Math.random());
centerY = height - 40;
isExploding = false;
isMovingLeft = (Math.random() < 0.5);
}
void updateForNewFrame() { // Move sub or increase explosionFrameNumber.
if (isExploding) {
explosionFrameNumber++;
if (explosionFrameNumber == 15) {
centerX = (int)(width*Math.random());
centerY = height - 40;
isExploding = false;
isMovingLeft = (Math.random() < 0.5);
}
}
else { // Move the sub.
if (Math.random() < 0.04) {
isMovingLeft = ! isMovingLeft;
}
if (isMovingLeft) {
centerX -= 5;
if (centerX <= 0) {
centerX = 0;
isMovingLeft = false;
}
}
else {
centerX += 5;
if (centerX > width) {
centerX = width;
isMovingLeft = true;
}
}
}
}
void draw(Graphics g) { // Draw sub and, if it is exploding, the explosion.
g.setColor(Color.BLACK);
g.fillOval(centerX - 30, centerY - 15, 60, 30);
if (isExploding) {
g.setColor(Color.YELLOW);
g.fillOval(centerX - 4*explosionFrameNumber,
centerY - 2*explosionFrameNumber,
8*explosionFrameNumber,
4*explosionFrameNumber);
g.setColor(Color.RED);
g.fillOval(centerX - 2*explosionFrameNumber,
centerY - explosionFrameNumber/2,
4*explosionFrameNumber,
explosionFrameNumber);
}
}
} // end nested class Submarine
} // end class SubKiller
Output:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class StrokeDemo extends JPanel
import java.awt.event.*;
import javax.swing.*;
public class StrokeDemo extends JPanel
{
public static void main(String[] args)
public static void main(String[] args)
{
JFrame window = new JFrame("Click and Drag; Right-click for Rectangles");
StrokeDemo content = new StrokeDemo();
window.setContentPane(content);
window.pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
JFrame window = new JFrame("Click and Drag; Right-click for Rectangles");
StrokeDemo content = new StrokeDemo();
window.setContentPane(content);
window.pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
private class Display extends JPanel
{
Stroke stroke; // The stroke used for drawing in this panel.
boolean antialiased; // Should antialiasing be used?
boolean drawLine = true; // Should a line be drawn, or a rectangle?
int x1, y1, x2, y2; // Endpoints of line or corners of rectangle.
Display(Stroke s, boolean a)
Stroke stroke; // The stroke used for drawing in this panel.
boolean antialiased; // Should antialiasing be used?
boolean drawLine = true; // Should a line be drawn, or a rectangle?
int x1, y1, x2, y2; // Endpoints of line or corners of rectangle.
Display(Stroke s, boolean a)
{
stroke = s;
antialiased = a;
x1 = y1 = 15;
x2 = 80;
y2 = 85;
setPreferredSize(new Dimension(100,100));
setBackground(Color.WHITE);
}
public void paintComponent(Graphics g)
stroke = s;
antialiased = a;
x1 = y1 = 15;
x2 = 80;
y2 = 85;
setPreferredSize(new Dimension(100,100));
setBackground(Color.WHITE);
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setStroke(stroke);
if (antialiased)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setStroke(stroke);
if (antialiased)
{
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
}
if (drawLine)
g2.drawLine(x1,y1,x2,y2);
else
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
}
if (drawLine)
g2.drawLine(x1,y1,x2,y2);
else
{
int a = Math.min(x1,x2);
int b = Math.min(y1,y2);
int w = Math.abs(x1 - x2);
int h = Math.abs(y1 - y2);
g2.drawRect(a,b,w,h);
}
}
}
private class MouseHandler implements MouseListener, MouseMotionListener
int a = Math.min(x1,x2);
int b = Math.min(y1,y2);
int w = Math.abs(x1 - x2);
int h = Math.abs(y1 - y2);
g2.drawRect(a,b,w,h);
}
}
}
private class MouseHandler implements MouseListener, MouseMotionListener
{
public void mousePressed(MouseEvent e)
public void mousePressed(MouseEvent e)
{
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
{
displays[i][j].x1 = e.getX();
displays[i][j].x2 = e.getX();
displays[i][j].y1 = e.getY();
displays[i][j].y2 = e.getY();
displays[i][j].drawLine = ! e.isMetaDown();
displays[i][j].repaint();
}
}
public void mouseDragged(MouseEvent e)
displays[i][j].x1 = e.getX();
displays[i][j].x2 = e.getX();
displays[i][j].y1 = e.getY();
displays[i][j].y2 = e.getY();
displays[i][j].drawLine = ! e.isMetaDown();
displays[i][j].repaint();
}
}
public void mouseDragged(MouseEvent e)
{
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
{
displays[i][j].x2 = e.getX();
displays[i][j].y2 = e.getY();
displays[i][j].repaint();
}
}
public void mouseReleased(MouseEvent e) { }
public void mouseMoved(MouseEvent e) { }
public void mouseClicked(MouseEvent e) { }
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
}
displays[i][j].x2 = e.getX();
displays[i][j].y2 = e.getY();
displays[i][j].repaint();
}
}
public void mouseReleased(MouseEvent e) { }
public void mouseMoved(MouseEvent e) { }
public void mouseClicked(MouseEvent e) { }
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
}
private Display[][] displays = new Display[5][3];
public StrokeDemo()
{
setLayout(new GridLayout(3,5,3,3));
setBorder(BorderFactory.createLineBorder(Color.GRAY,3));
setBackground(Color.GRAY);
displays[0][0] = new Display(new BasicStroke(1), false);
displays[1][0] = new Display(new BasicStroke(2), false);
displays[2][0] = new Display(new BasicStroke(5), false);
displays[3][0] = new Display(new BasicStroke(10), false);
displays[4][0] = new Display(new BasicStroke(20), false);
displays[0][1] = new Display(new BasicStroke(1,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[1][1] = new Display(new BasicStroke(2,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[2][1] = new Display(new BasicStroke(5,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[3][1] = new Display(new BasicStroke(10,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[4][1] = new Display(new BasicStroke(20,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[0][2] = new Display(new BasicStroke(1, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[1][2] = new Display(new BasicStroke(2, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[2][2] = new Display(new BasicStroke(5, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[3][2] = new Display(new BasicStroke(10, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[4][2] = new Display(new BasicStroke(20, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
MouseHandler listener = new MouseHandler();
for (int row = 0; row < 3; row++)
for (int col = 0; col < 5; col++)
setLayout(new GridLayout(3,5,3,3));
setBorder(BorderFactory.createLineBorder(Color.GRAY,3));
setBackground(Color.GRAY);
displays[0][0] = new Display(new BasicStroke(1), false);
displays[1][0] = new Display(new BasicStroke(2), false);
displays[2][0] = new Display(new BasicStroke(5), false);
displays[3][0] = new Display(new BasicStroke(10), false);
displays[4][0] = new Display(new BasicStroke(20), false);
displays[0][1] = new Display(new BasicStroke(1,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[1][1] = new Display(new BasicStroke(2,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[2][1] = new Display(new BasicStroke(5,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[3][1] = new Display(new BasicStroke(10,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[4][1] = new Display(new BasicStroke(20,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND), true);
displays[0][2] = new Display(new BasicStroke(1, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[1][2] = new Display(new BasicStroke(2, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[2][2] = new Display(new BasicStroke(5, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[3][2] = new Display(new BasicStroke(10, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
displays[4][2] = new Display(new BasicStroke(20, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL, 10, new float[] {5,5}, 0), true);
MouseHandler listener = new MouseHandler();
for (int row = 0; row < 3; row++)
for (int col = 0; col < 5; col++)
{
add(displays[col][row]);
displays[col][row].addMouseListener(listener);
displays[col][row].addMouseMotionListener(listener);
}
}
}
add(displays[col][row]);
displays[col][row].addMouseListener(listener);
displays[col][row].addMouseMotionListener(listener);
}
}
}
Output:
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class StatesAndCapitalsTableDemo extends JPanel
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class StatesAndCapitalsTableDemo extends JPanel
{
public static void main(String[] args)
public static void main(String[] args)
{
JFrame window = new JFrame("Trivial Table Demo");
StatesAndCapitalsTableDemo content = new StatesAndCapitalsTableDemo();
window.setContentPane(content);
window.setSize( new Dimension(350,300) );
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
JFrame window = new JFrame("Trivial Table Demo");
StatesAndCapitalsTableDemo content = new StatesAndCapitalsTableDemo();
window.setContentPane(content);
window.setSize( new Dimension(350,300) );
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setLocation( (screenSize.width - window.getWidth())/2,
(screenSize.height - window.getHeight())/2 );
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setVisible(true);
}
public StatesAndCapitalsTableDemo()
{
String[] columnHeads = new String[] { "State", "Capital City" };
JTable table = new JTable(statesAndCapitals, columnHeads);
setLayout(new BorderLayout());
add( new JScrollPane(table), BorderLayout.CENTER );
}
String[] columnHeads = new String[] { "State", "Capital City" };
JTable table = new JTable(statesAndCapitals, columnHeads);
setLayout(new BorderLayout());
add( new JScrollPane(table), BorderLayout.CENTER );
}
private static String[][] statesAndCapitals = new String[][]
{
{ "Alabama", "Montgomery" },
{ "Alaska", "Juneau" },
{ "Arizona", "Phoenix" },
{ "Arkansas", "Little Rock" },
{ "California", "Sacramento" },
{ "Colorado", "Denver" },
{ "Connecticut", "Hartford" },
{ "Delaware", "Dover" },
{ "Florida", "Tallahassee" },
{ "Georgia", "Atlanta" },
{ "Hawaii", "Honolulu" },
{ "Idaho", "Boise" },
{ "Illinois", "Springfield" },
{ "Indiana", "Indianapolis" },
{ "Iowa", "Des Moines" },
{ "Kansas", "Topeka" },
{ "Kentucky", "Frankfort" },
{ "Louisiana", "Baton Rouge" },
{ "Maine", "Augusta" },
{ "Maryland", "Annapolis" },
{ "Massachusetts", "Boston" },
{ "Michigan", "Lansing" },
{ "Minnesota", "St. Paul" },
{ "Mississippi", "Jackson" },
{ "Missouri", "Jefferson City" },
{ "Montana", "Helena" },
{ "Nebraska", "Lincoln" },
{ "Nevada", "Carson City" },
{ "New Hampshire", "Concord" },
{ "New Jersey", "Trenton" },
{ "New Mexico", "Santa Fe" },
{ "New York", "Albany" },
{ "North Carolina", "Raleigh" },
{ "North Dakota", "Bismarck" },
{ "Ohio", "Columbus" },
{ "Oklahoma", "Oklahoma City" },
{ "Oregon", "Salem" },
{ "Pennsylvania", "Harrisburg" },
{ "Rhode Island", "Providence" },
{ "South Carolina", "Columbia" },
{ "South Dakota", "Pierre" },
{ "Tennessee", "Nashville" },
{ "Texas", "Austin" },
{ "Utah", "Salt Lake City" },
{ "Vermont", "Montpelier" },
{ "Virginia", "Richmond" },
{ "Washington", "Olympia" },
{ "West Virginia", "Charleston" },
{ "Wisconsin", "Madison" },
{ "Wyoming", "Cheyenne" }
};
}
{ "Alabama", "Montgomery" },
{ "Alaska", "Juneau" },
{ "Arizona", "Phoenix" },
{ "Arkansas", "Little Rock" },
{ "California", "Sacramento" },
{ "Colorado", "Denver" },
{ "Connecticut", "Hartford" },
{ "Delaware", "Dover" },
{ "Florida", "Tallahassee" },
{ "Georgia", "Atlanta" },
{ "Hawaii", "Honolulu" },
{ "Idaho", "Boise" },
{ "Illinois", "Springfield" },
{ "Indiana", "Indianapolis" },
{ "Iowa", "Des Moines" },
{ "Kansas", "Topeka" },
{ "Kentucky", "Frankfort" },
{ "Louisiana", "Baton Rouge" },
{ "Maine", "Augusta" },
{ "Maryland", "Annapolis" },
{ "Massachusetts", "Boston" },
{ "Michigan", "Lansing" },
{ "Minnesota", "St. Paul" },
{ "Mississippi", "Jackson" },
{ "Missouri", "Jefferson City" },
{ "Montana", "Helena" },
{ "Nebraska", "Lincoln" },
{ "Nevada", "Carson City" },
{ "New Hampshire", "Concord" },
{ "New Jersey", "Trenton" },
{ "New Mexico", "Santa Fe" },
{ "New York", "Albany" },
{ "North Carolina", "Raleigh" },
{ "North Dakota", "Bismarck" },
{ "Ohio", "Columbus" },
{ "Oklahoma", "Oklahoma City" },
{ "Oregon", "Salem" },
{ "Pennsylvania", "Harrisburg" },
{ "Rhode Island", "Providence" },
{ "South Carolina", "Columbia" },
{ "South Dakota", "Pierre" },
{ "Tennessee", "Nashville" },
{ "Texas", "Austin" },
{ "Utah", "Salt Lake City" },
{ "Vermont", "Montpelier" },
{ "Virginia", "Richmond" },
{ "Washington", "Olympia" },
{ "West Virginia", "Charleston" },
{ "Wisconsin", "Madison" },
{ "Wyoming", "Cheyenne" }
};
}
Output:
import javax.swing.*;
public class SimpleJLabelExample
public class SimpleJLabelExample
{
public static void main(String[] args)
public static void main(String[] args)
{
JLabel label = new JLabel("A Very Simple Text Label");
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(label); // adds to CENTER
frame.pack();
frame.setVisible(true);
}
}
JLabel label = new JLabel("A Very Simple Text Label");
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(label); // adds to CENTER
frame.pack();
frame.setVisible(true);
}
}
Output:
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class PopupCalculatorApplet extends JApplet implements ActionListener
import java.awt.Button;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class PopupCalculatorApplet extends JApplet implements ActionListener
{
public void init()
public void init()
{
Button calcButton = new Button("Calculator");
calcButton.addActionListener(this);
Container contentPane = getContentPane();
contentPane.add(calcButton);
}
public void actionPerformed(ActionEvent evt)
Button calcButton = new Button("Calculator");
calcButton.addActionListener(this);
Container contentPane = getContentPane();
contentPane.add(calcButton);
}
public void actionPerformed(ActionEvent evt)
{
if (calc.isVisible())
calc.setVisible(false);
else
calc.show();
}
private JFrame calc = new CalculatorFrame();
}
class CalculatorPanel extends JPanel implements ActionListener
if (calc.isVisible())
calc.setVisible(false);
else
calc.show();
}
private JFrame calc = new CalculatorFrame();
}
class CalculatorPanel extends JPanel implements ActionListener
{
public CalculatorPanel()
public CalculatorPanel()
{
setLayout(new BorderLayout());
display = new JTextField("0");
display.setEditable(false);
add(display, "North");
JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));
String buttons = "789/456*123-0.=+";
for (int i = 0; i < buttons.length(); i++)
addButton(p, buttons.substring(i, i + 1));
add(p, "Center");
}
private void addButton(Container c, String s)
setLayout(new BorderLayout());
display = new JTextField("0");
display.setEditable(false);
add(display, "North");
JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));
String buttons = "789/456*123-0.=+";
for (int i = 0; i < buttons.length(); i++)
addButton(p, buttons.substring(i, i + 1));
add(p, "Center");
}
private void addButton(Container c, String s)
{
JButton b = new JButton(s);
c.add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent evt)
JButton b = new JButton(s);
c.add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent evt)
{
String s = evt.getActionCommand();
if ('0' <= s.charAt(0) && s.charAt(0) <= '9' || s.equals("."))
String s = evt.getActionCommand();
if ('0' <= s.charAt(0) && s.charAt(0) <= '9' || s.equals("."))
{
if (start)
display.setText(s);
else
display.setText(display.getText() + s);
start = false;
}
if (start)
display.setText(s);
else
display.setText(display.getText() + s);
start = false;
}
else
{
if (start)
if (start)
{
if (s.equals("-"))
if (s.equals("-"))
{
display.setText(s);
start = false;
} else
op = s;
}
display.setText(s);
start = false;
} else
op = s;
}
else
{
calculate(Double.parseDouble(display.getText()));
op = s;
start = true;
}
}
}
public void calculate(double n)
calculate(Double.parseDouble(display.getText()));
op = s;
start = true;
}
}
}
public void calculate(double n)
{
if (op.equals("+"))
arg += n;
else if (op.equals("-"))
arg -= n;
else if (op.equals("*"))
arg *= n;
else if (op.equals("/"))
arg /= n;
else if (op.equals("="))
arg = n;
display.setText("" + arg);
}
private JTextField display;
private double arg = 0;
private String op = "=";
private boolean start = true;
}
class CalculatorFrame extends JFrame
if (op.equals("+"))
arg += n;
else if (op.equals("-"))
arg -= n;
else if (op.equals("*"))
arg *= n;
else if (op.equals("/"))
arg /= n;
else if (op.equals("="))
arg = n;
display.setText("" + arg);
}
private JTextField display;
private double arg = 0;
private String op = "=";
private boolean start = true;
}
class CalculatorFrame extends JFrame
{
public CalculatorFrame()
public CalculatorFrame()
{
setTitle("Calculator");
setSize(200, 200);
Container contentPane = getContentPane();
contentPane.add(new CalculatorPanel());
}
}
setTitle("Calculator");
setSize(200, 200);
Container contentPane = getContentPane();
contentPane.add(new CalculatorPanel());
}
}
Output:
import javax.swing.*;
import java.awt.*;
public class MnemonicLabels
import java.awt.*;
public class MnemonicLabels
{
public static void main(String[] args)
public static void main(String[] args)
{
JTextField firstField = new JTextField(10);
JTextField middleField = new JTextField(10);
JTextField lastField = new JTextField(10);
// Create labels and mnemonics
JLabel firstLabel = new JLabel("First Name", JLabel.RIGHT);
firstLabel.setDisplayedMnemonic('F');
firstLabel.setLabelFor(firstField);
JLabel middleLabel = new JLabel("Middle Initial", JLabel.RIGHT);
middleLabel.setDisplayedMnemonic('I');
middleLabel.setDisplayedMnemonicIndex(7); // requires 1.4
middleLabel.setLabelFor(middleField);
JLabel lastLabel = new JLabel("Last Name", JLabel.RIGHT);
lastLabel.setDisplayedMnemonic('L');
lastLabel.setLabelFor(lastField);
// Layout and Display
JPanel p = new JPanel();
p.setLayout(new GridLayout(3, 2, 5, 5));
p.add(firstLabel);
p.add(firstField);
p.add(middleLabel);
p.add(middleField);
p.add(lastLabel);
p.add(lastField);
JFrame f = new JFrame("MnemonicLabels");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(p);
f.pack();
f.setVisible(true);
}
}
JTextField firstField = new JTextField(10);
JTextField middleField = new JTextField(10);
JTextField lastField = new JTextField(10);
// Create labels and mnemonics
JLabel firstLabel = new JLabel("First Name", JLabel.RIGHT);
firstLabel.setDisplayedMnemonic('F');
firstLabel.setLabelFor(firstField);
JLabel middleLabel = new JLabel("Middle Initial", JLabel.RIGHT);
middleLabel.setDisplayedMnemonic('I');
middleLabel.setDisplayedMnemonicIndex(7); // requires 1.4
middleLabel.setLabelFor(middleField);
JLabel lastLabel = new JLabel("Last Name", JLabel.RIGHT);
lastLabel.setDisplayedMnemonic('L');
lastLabel.setLabelFor(lastField);
// Layout and Display
JPanel p = new JPanel();
p.setLayout(new GridLayout(3, 2, 5, 5));
p.add(firstLabel);
p.add(firstField);
p.add(middleLabel);
p.add(middleField);
p.add(lastLabel);
p.add(lastField);
JFrame f = new JFrame("MnemonicLabels");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(p);
f.pack();
f.setVisible(true);
}
}
Output:
public class MainMultiple
{
public static void main(String args[])
public static void main(String args[])
{
main(122);
main('f');
main("hello java");
}
main(122);
main('f');
main("hello java");
}
public static void main(int i)
{
System.out.println("Overloaded main()"+i);
}
System.out.println("Overloaded main()"+i);
}
public static void main(char i)
{
System.out.println("Overloaded main()"+i);
}
System.out.println("Overloaded main()"+i);
}
public static void main(String str)
{
System.out.println("Overloaded main()"+str);
}
System.out.println("Overloaded main()"+str);
}
}
Output:
Overloaded main()122
Overloaded main()f
Overloaded main()hello java
