Flow Layout in Java…

Example : FlowLayoutDemo

import java.applet.*;
import java.awt.*;
/*
<applet code="FlowLayoutDemo" width=300 height=200>
</applet>
*/
public class FlowLayoutDemo extends Applet
{
public void init()
{
setLayout(new FlowLayout(FlowLayout.CENTER,5,5));
for(int i=1;i<=10;i++)
{
add(new Button("BUTTON "+i));
}
}
}

Grid Layout…

Example : GridLayoutDemo

import java.awt.*;
import java.applet.*;
/*
<applet code="GridLayoutDemo" width=300 height=200>
</applet>
*/public class GridLayoutDemo extends Applet
{
static final int n=4;
public void init()
{
setLayout(new GridLayout(n,n));
setFont(new Font("SansSerif",Font.BOLD,24));
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
{
{
int k=i*n+j;
if(k>0)
add(new Button(""+k));
}
}
}
}

Border Layouts…

Example : BorderLayoutDemo

import java.awt.*;
import java.applet.*;
import java.util.*;
/*
<applet code="BorderLayoutDemo" width=400 height=200>
</applet>
*/
public class BorderLayoutDemo extends Applet
{
public void init()
{
setLayout(new BorderLayout());
add(new Button("This is across the top."),BorderLayout.NORTH);
add(new Label("The Footer message might go here."),BorderLayout.SOUTH);
add(new Button("Right"),BorderLayout.EAST);
add(new Button("Left"),BorderLayout.WEST);
String msg="The reason able man addas"+ "him self to the world;\n"+"the unreasonable onw presits in"+"trying to adopts the world to himself.\n"+"Therefre all progream depends"+"On the unreasonalbe man.\n\n"+"-George Berand shaw\n\n";
add(new TextArea(msg),BorderLayout.CENTER);
}
}

Insets…

Example : BorderText

import java.awt.*;
/*
<applet code="BorderText" width=200 height=300>
</applet>
*/
public class BorderText extends java.applet.Applet
{
public void init()
{
setLayout(new BorderLayout(5,5));
add("South",new Button("Button of the Applet"));
add("North",new Button("Top of the Applet"));
add("East",new Button("Right"));
add("West",new Button("Left"));
add("Center",new TextArea("Appears at the center"));
}
public Insets getInsets()
{
return new Insets(20,20,10,10);
}
}

Creating a Frame Window in an Applet…

Example : FrameApplet

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
/*
<applet code="FrameApplet.class"width=250 height=200>
</applet>
*/
class  Frame2 extends Frame
{
Frame2(String title)
{
super(title);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we)
{
dispose();
}
});
}
}
public class FrameApplet extends Applet implements  ActionListener
{
public void init()
{ 
Button b=new Button("Create Frame");
b.addActionListener(this);
add(b);
}
public void actionPerformed(ActionEvent ae)
{
Frame2 f2=new Frame2("My new Window");
f2.show();
f2.setSize(300,300);
}
}
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

Menu Actions…

Example : MenuDemo

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="MenuDemo"width=250 height=250>
</applet>
*/
class MenuFrame extends Frame
{
String msg="";
CheckboxMenuItem debug,test;
MenuFrame(String title)
{
super(title);
MenuBar mbar=new MenuBar();
setMenuBar(mbar);
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);
debug=new CheckboxMenuItem("Debug");
edit.add(debug);
test=new CheckboxMenuItem("Testing");
edit.add(test);
mbar.add(edit);
MyMenuHandler handler=new MyMenuHandler(this);
item1.addActionListener(handler);
item2.addActionListener(handler);
item3.addActionListener(handler);
item4.addActionListener(handler);
item5.addActionListener(handler);
item6.addActionListener(handler);
item7.addActionListener(handler);
item8.addActionListener(handler);
item9.addActionListener(handler);
item10.addActionListener(handler);
item11.addActionListener(handler);
item12.addActionListener(handler);
debug.addItemListener(handler);
test.addItemListener(handler);
MyWindowAdapter adapter=new MyWindowAdapter(this);
addWindowListener(adapter);
}
public void paint(Graphics g)
{
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 MyWindowAdapter extends WindowAdapter
{
MenuFrame menuFrame;
public MyWindowAdapter(MenuFrame menuFrame)
{
this.menuFrame=menuFrame;
}
public void WindowClosing(WindowEvent we)
{
menuFrame.setVisible(false);
}
}
class MyMenuHandler implements ActionListener,ItemListener
{
MenuFrame menuFrame;
public MyMenuHandler(MenuFrame menuFrame)
{
this.menuFrame=menuFrame;
}
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();
}
public void itemStateChanged(ItemEvent ie)
{
menuFrame.repaint();
}
}
public class MenuDemo extends Applet
{
Frame f;
public void init()
{
f=new MenuFrame("MenuDemo");
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);
}
}

Dialog Boxes..

Example : MessageBox

import java.awt.*;
import java.awt.event.*;
class MessageBox extends Dialog
{
MessageBox(Frame fm,String lab)
{
super(fm,"Message",true);
setLayout(new GridLayout(2,1,0,0));
Panel p1=new Panel();
Panel p2=new Panel();
Button b1,b2;
p1.setFont(new Font("TimesRoman",Font.BOLD,18));
p1.setLayout(new FlowLayout(FlowLayout.CENTER,20,15));
p2.setLayout(new FlowLayout(FlowLayout.CENTER,20,20));
p1.add(new Label(lab));
b1=new Button("ok");
b1.addActionListener(new B1());
p2.add(b1);
b2=new Button("cancel");
b2.addActionListener(new B1());
p2.add(b2);
add(p1);
add(p2);
setSize(350,125);
setTitle("MessageBox");
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent w)
{
System.exit(0);
}
});
}
class B1 implements ActionListener
{
public  void actionPerformed(ActionEvent e)
{
try
{
Button ok=(Button)e.getSource();
String s=ok.getLabel();
if(s.equals("ok")||s.equals("cancel"))
{
dispose();
System.exit(0);
}
}
catch(Exception n){}
}
}
}
//----------MessageApplication Clss-----------                                  
public class MessageApplication extends Frame
{
boolean a;
MessageApplication()
{
MessageBox mb=new MessageBox(this,"JavaAlert:This is a Message Box");
mb.setLocation(200,200);
mb.setVisible(true);
a=false;
}
public static void main(String args[])
{
MessageApplication fm=new MessageApplication();
System.out.println("popping out message box");
fm.setVisible(true);
}
}

File Dialogs…

Example : FileDialogDemo

import java.awt.*;
import java.awt.event.*;
class FileDialogDemo extends Frame implements ActionListener
{
Frame t;
Button b1;
Label l1;
FileDialogDemo()
{
t=new Frame("Sample Frame");
t.setLayout(new FlowLayout());
b1=new Button("Open");
l1=new Label("File selected:");
t.add(b1);
t.add(l1);
b1.addActionListener(this);
t.setSize(300,300);
t.setVisible(true);
}
public static void main(String args[])
{
FileDialogDemo fd=new FileDialogDemo();
}
public void actionPerformed(ActionEvent a)
{
FileDialog fd=new FileDialog(t,"FileDialog");
fd.setVisible(true);
l1.setText(l1.getText()+fd.getFile());
}
}