JAVA CODE TO GENERATE RANDOM PASSWORD

public class PasswordGenerator {

static final String AB = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
    static Random rnd = new Random();

    public String randomString(int len)
    {
          StringBuilder sb = new StringBuilder(len);
           for( int i = 0; i < len; i++ )
                  sb.append( AB.charAt( rnd.nextInt(AB.length()) ) );
                System.out.println(sb);
           return sb.toString();
    }
    public static void main(String a[]){
        PasswordGenerator obj=new PasswordGenerator();
         String s=obj.randomString(6);
        System.out.println(s);
    }

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Radio Button and Button Group in java

 private javax.swing.JRadioButton female=new javax.swing.JRadioButton();

 private javax.swing.JRadioButton male=new javax.swing.JRadioButton();

 private javax.swing.ButtonGroup sex= new javax.swing.ButtonGroup();

  sex.add(female);

 sex.add(male);

String str;

if(male.isSelected())

str="M";
else if (female.isSelected())

str="F";


str will have the datails of the selected Butto

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JAVA PROGRAM FOR INFIX TO POSTFIX CONVERSION

import java.io.*;
class f
{
int i,l,top=-1;
String s;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
public void read()throws IOException
{
System.out.print("Enter the string");
s=br.readLine();
}
public void postfix()throws IOException
{
int l=s.length();
for(i=0;i<l;i++)
{
char d=s.charAt(i);
if(d>=0 && d<=9)
{
push(d);
}
else
{char c1=pop();
char c2=pop();
switch (d)
{
case '+':push(c1+c2);break;
case '-':push(c1-c2);break;
case '*':push(c1*c2);break;
case '/':push(c1/c2);break;
//case '':push(c1%c2);break;
}
}
}}
public void push(int e)
{
if (top>=(l-1))
System.out.print("Stack is full");
else
{
top++;
s[top]=e;
}}
char pop()
{
char tp;
tp=s[top];
top--;
return(tp);

}
}
class InFixPost
{
public static void main (String args[])throws IOException
{
f t=new f();
t.read();
t.postfix();
}
}

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JAVA PROGRAM TO READ DATA FROM COMMAND PROMPT AND DISPLAY IT

import java.io.*;
class Subp
{
int a[],n,b[],j,i;

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
public void getData()throws IOException
{
System.out.println("enter the limit and enter the nos:");
n=Integer.parseInt(br.readLine());
a=new int[n+1];
for( i=0;i<n;i++)
{
a[i]=Integer.parseInt(br.readLine());
}}
public void display()
{
System.out.print("reverse is ");
b=new int[21];
for(i=0,j=n-1;i<n;i++,j--)
{
b[j]=a[i];
}
for(i=0,j=n;i<n;i++,j--)
{
a[i]=b[i];
System.out.print(a[i]);
}
}
}
class Array
{
public static void main(String arg[])throws IOException

{
Subp t=new Subp();
t.getData();
t.display();
}
}

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JAVA PROGRAM FOR CHECK WHETHER THE GIVEN NUMBER IS ARMSTRONG OR NOT

class arm
{
public static void main(String arg[])
{
int n,t,s,r;
n=Integer.parseInt(arg[0]);
t=n;
s=0;
while(n>0)
{
r=n%10;
s=s+(r*r*r);
n=n/10;
}
if(t==s)
{
System.out.println("Given no. "+t+" is an armstron");
}
else
{
System.out.println("Given no. "+t+" is not anarmstron");
}
}
}

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Java Program To Display Pascal's Triangle

class StarsTest

{ 

 public static void main(String args[])

 {

  int stars=1,lines=5,spaces=5;

  int i=1,j,k;

  for(i=0;i<lines;i++)

  {

   // print spaces first

  for(k=0;k<spaces;k++)

  System.out.print(" ");

for(j=0j<(stars);j++)                                 System.out.print("*"); 

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