class fact
{
public static void main(String args[])
{
int cnt,i,j;
cnt=args.length;
for(i=0;i<cnt;i++)
{
int f=1;
for(j=1;j<=Integer.parseInt(args[i]);j++)
f=f*j;
System.out.println("the fact of "+args[i]+"is"+f);
}
}
}




=================================
mouse : 

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*<applet code="moused.class" width=300 height=300>
</applet>*/
public class moused extends Applet implements MouseListener,MouseMotionListener
{
String msg=" ";
int mx=10,my=20;
public void init()
{
addMouseListener(this);
addMouseMotionListener(this);
}
public void mouseClicked(MouseEvent me)
{
showStatus("mouse clicked");
}
public void mouseEntered(MouseEvent me)
{
//showStatus("mouse entered");
msg="mouse entered";
repaint();
}
public void mouseExited(MouseEvent me)
{
msg="mouse exited";
repaint();
}
public void mousePressed(MouseEvent me)
{
msg="mouse pressed";
repaint();
}
public void mouseReleased(MouseEvent me)
{
msg="mouse released";
repaint();
}
public void mouseDragged(MouseEvent me)
{
showStatus("mouse dragged"+me.getX()+"and"+me.getY());
}
public void mouseMoved(MouseEvent me)
{
showStatus("mouse moved"+me.getX()+"and"+me.getY());
}

public void paint(Graphics g)
{
g.drawString(msg,mx,my);
}
}





============================================
prime : 

class prime
{
int n;
prime (int num)
{
n=num;
}
void gener()
{
int flag;
for (int i=3; i<=n;i++)
{
flag=0;
for(int j=2;j<i;j++)
if (i%j==0)
{
flag=1;
break;
}
if (flag==0)
System.out.println(i);
}
}
}
class primer
{
public static void main(String args[])
{
int num;
num=Integer.parseInt(args[0]);
prime t=new prime(num);
System.out.println(1);
System.out.println(2);
t.gener();
}
}

==========================================
student : 

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/*<applet code=student.class width=300 height=300>
</applet>*/
public class student extends Applet implements ActionListener
{
String s1,s2,s3,s4;
Label l1,l2,l3,l4;
TextField t1,t2,t3,t4;
//TextArea t4;
Button b;
public void init()
{
l1=new Label("REG NO  ");
t1=new TextField(20);
l2=new Label("NAME    ");
t2=new TextField(20);
l3=new Label("COURSE  ");
t3=new TextField(20);
l4=new Label("ADDRESS ");
t4=new TextField(20);
b=new Button("PRINT");
add(l1);
add(t1);
add(l2);
add(t2);
add(l3);
add(t3);
add(l4);
add(t4);
add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==b)
{
s1=t1.getText();
s2=t2.getText();
s3=t3.getText();
s4=t4.getText();
repaint();
}
}
public void paint(Graphics g)
{
g.drawString(s1,10,20);
g.drawString(s2,20,30);
g.drawString(s3,30,40);
g.drawString(s4,40,50);
}
}





========================================
rhmbus : 

import java.ip.*
public class rhmbus
{
public static void main (string args[])throw IoException
{
int i,j,n;
buffered reader br=new buffer reader (new Input stream Reader (system.in));
system.out.println("enter the limit:");
n=Integer.Passnt(br.readerLine());
for(i=1;i<=n;i++)
{
for (j=n-i;j>0;j--)
system.out.println("*");
system.out.print(" ");
}
for (i=n-1;j>=1;i--)
{
for (j=1;j<=n-i;j++)
system.outprime (" ");
for (j=1;j<=i*2-1;j++)
system.out.print("*");
system.out.print(" " );
}
}
}

===================================