Java awt

AWT Classes
• Button Creates a push button control.
• BorderLayout The border layout manager.
Border layouts use five components: North,
South, East, West, and Center.
• CardLayout The card layout manager.
• Card layouts emulate index cards.
• Only the one on top is showing.
• Checkbox Creates a check box control.
• CheckboxGroup Creates a group of check box

// Demonstrate text field.
import java.awt.*;
import java.awt.event.*;
importjava.applet.*;
/*<applet code="TextFieldDemo" width=380 height=150> </applet> */
public class TextFieldDemo extends Applet
implements ActionListener {
TextField name, pass;
public void init() {
Label namep = new Label("Name: ", Label.RIGHT);
Label passp = new Label("Password: ", Label.RIGHT);
name = new TextField(12);
pass = new TextField(8);
pass.setEchoChar('?');
add(namep);
add(name);
add(passp);
add(pass);
// register to receive action events
name.addActionListener(this);
pass.addActionListener(this);
}

// User pressed Enter.
public void actionPerformed(ActionEvent ae) {
repaint();
}
public void paint(Graphics g) {
g.drawString("Name: " + name.getText(), 6, 60);
g.drawString("Selected text in name: "
+ name.getSelectedText(), 6, 80);
g.drawString("Password: " + pass.getText(), 6, 100);
}
}

// Illustrate menus.
import java.awt.*;
import java.applet.*;
/* <applet code="MenuDemo" width=250 height=250> </applet> */
// Create a subclass of Frame
class MenuFrame extends Frame {
String msg = "";
CheckboxMenuItem debug, test;
MenuFrame(String title) {
super(title);
// create menu bar and add it to frame
MenuBar mbar = new MenuBar();
setMenuBar(mbar);
// create the menu items
Menu file = new Menu("File");
MenuItem item1, item2, item3, item4, item5;
file.add(item1 = new MenuItem("New..."));
file.add(item2 = new MenuItem("Open..."));
file.add(item3 = new MenuItem("Close"));
file.add(item4 = new MenuItem("-"));
file.add(item5 = new MenuItem("Quit..."));

mbar.add(file);
Menu edit = new Menu("Edit");
MenuItem item6, item7, item8, item9;
edit.add(item6 = new MenuItem("Cut"));
edit.add(item7 = new MenuItem("Copy"));
edit.add(item8 = new MenuItem("Paste"));
edit.add(item9 = new MenuItem("-"));
Menu sub = new Menu("Special"); MenuItem item10, item11, item12;
sub.add(item10 = new MenuItem("First"));
sub.add(item11 = new MenuItem("Second"));
sub.add(item12 = new MenuItem("Third"));
edit.add(sub);
// these are checkable menu items
debug = new CheckboxMenuItem("Debug");
edit.add(debug);
test = new CheckboxMenuItem("Testing");
edit.add(test);
mbar.add(edit);

// create an object to handle action and item events
MyMenuHandler handler = new MyMenuHandler(this);
// register it to receive those events
item1.addActionListener(handler);
debug.addItemListener(handler);
test.addItemListener(handler);
// create an object to handle window events
MyWindowAdapter adapter = new MyWindowAdapter(this);
// register it to receive those events
addWindowListener(adapter);
}

g.drawString(msg, 10, 200); if(debug.getState())
g.drawString("Debug is on.", 10, 220);
else
g.drawString("Debug is off.", 10, 220);
if(test.getState())
g.drawString("Testing is on.", 10, 240);
else
g.drawString("Testing is off.", 10, 240);
}
}

class MyMenuHandler implements ActionListener, ItemListener {
MenuFrame menuFrame;
public MyMenuHandler(MenuFrame menuFrame) {
this.menuFrame = menuFrame;
}
// Handle action events
public void actionPerformed(ActionEvent ae) {
String msg = "You selected ";
String arg = (String)ae.getActionCommand();
if(arg.equals("New..."))
msg += "New.";
else if(arg.equals("Open..."))
msg += "Open.";
else if(arg.equals("Close"))
msg += "Close.";
else if(arg.equals("Quit..."))
msg += "Quit.";
else if(arg.equals("Edit"))
msg += "Edit.";

else if(arg.equals("Cut"))
msg += "Cut.";
else if(arg.equals("Copy"))
msg += "Copy.";
else if(arg.equals("Paste"))
msg += "Paste.";
else if(arg.equals("First"))
msg += "First.";
else if(arg.equals("Second"))
msg += "Second.";
else if(arg.equals("Third"))
msg += "Third.";
else if(arg.equals("Debug"))
msg += "Debug.";
else if(arg.equals("Testing"))
msg += "Testing.";
menuFrame.msg = msg;
menuFrame.repaint();
}
// Handle item events
public void itemStateChanged(ItemEvent ie) {
menuFrame.repaint(); } }

// Create frame window.
public class MenuDemo extends Applet {
Frame f;
f = new MenuFrame("Menu Demo");
int width = Integer.parseInt(getParameter("width"));
int height = Integer.parseInt(getParameter("height"));
setSize(new Dimension(width, height));
f.setSize(width, height);
f.setVisible(true);
}
public void start() {f.setVisible(true);
}
public void stop() {
f.setVisible(false);
}
}

Graphics
public class XOR extends Applet {
int chsX=100, chsY=100;
g.drawLine(0, 0, 100, 100);
g.drawLine(0, 100, 100, 0);
g.setColor(Color.blue);
g.drawLine(40, 25, 250, 180);
g.drawLine(75, 90, 400, 400);
g.setColor(Color.green);
g.drawRect(10, 10, 60, 50);
g.fillRect(100, 10, 60, 50);
g.setColor(Color.red);
g.drawRoundRect(190, 10, 60, 50, 15, 15);
g.fillRoundRect(70, 90, 140, 100, 30, 40);
g.setColor(Color.cyan);
g.drawLine(20, 150, 400, 40);
g.drawLine(5, 290, 80, 19);
} }

// Draw Polygon
import java.awt.*;
/* <applet code="HourGlass" width=230 height=210> </applet> */
public class HourGlass extends Applet {
int xpoints[] = {30, 200, 30, 200, 30};
int ypoints[] = {30, 30, 200, 200, 30};
int num = 5;
g.drawPolygon(xpoints, ypoints, num);
}
}

// Draw Ellipses
import java.awt.*;
/*
<applet code="Ellipses" width=300 height=200>
</applet>
*/
public class Ellipses extends Applet {
g.drawOval(10, 10, 50, 50);
g.fillOval(100, 10, 75, 50);
g.drawOval(190, 10, 90, 30);
g.fillOval(70, 90, 140, 100);
}
}

// Create a frame window.
public class AppWindow extends Applet {
String keymsg = "This is a test.";
addKeyListener(new MyKeyAdapter(this));
}
g.drawString(keymsg, 10, 40);
}
}
class MyKeyAdapter extends KeyAdapter {
AppWindow appWindow;
public MyKeyAdapter(AppWindow appWindow) {
this.appWindow = appWindow;
}
public void keyTyped(KeyEvent ke) {
appWindow.keymsg += ke.getKeyChar();
appWindow.repaint();
};
}

Drawing Arcs
• Arcs can be drawn with drawArc( ) and
fillArc(), shown here:
• void drawArc(int top, int left, int width, int
height, int startAngle,int sweepAngle)
• void fillArc(int top, int left, int width, int
height, int startAngle, int sweepAngle)

Sample
import java.awt.*;
/*
<applet code="Arcs" width=300 height=200>
</applet>
*/
public class Arcs extends Applet {
g.drawArc(10, 40, 70, 70, 0, 75);
g.fillArc(100, 40, 70, 70, 0, 75);
g.drawArc(10, 100, 70, 80, 0, 175);
g.fillArc(100, 100, 70, 90, 0, 270);
g.drawArc(200, 80, 80, 80, 0, 180);
}
}

// Create a frame window.
public class AppWindow extends Applet {
String mousemsg = "";
int mouseX=30, mouseY=30;
addMouseListener(new
MyMouseAdapter(this));
}
g.drawString(mousemsg, mouseX,
mouseY);
}
class MyMouseAdapter extends
MouseAdapter {AppWindow appWindow;
public MyMouseAdapter(AppWindow
appWindow) {
}
public void mousePressed(MouseEvent
me) {
appWindow.mouseX = me.getX();
appWindow.mouseY = me.getY();
appWindow.mousemsg = "Mouse Down
at " + appWindow.mouseX +
", " + appWindow.mouseY;
}
}

AppWindow appWindow;
public MyMouseAdapter(AppWindow appWindow) {
}
public void mousePressed(MouseEvent me) {
appWindow.mouseX = me.getX();
appWindow.mouseY = me.getY();
appWindow.mousemsg = "Mouse Down at " + appWindow.mouseX +
", " + appWindow.mouseY;
}
}
class MyWindowAdapter extends WindowAdapter {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
}

Java awt

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