a closer look at methods & class in java

AUTHOR

//SOME PIRAMID EXAMPLE IN JAVA
package com.swain.cell;

public class Piramid2 {

public static void main(String args[]){
int i,j;
for(i=1;i<=4;i++)
{
for(j=1;j<=i;j++)
System.out.print(" "+j);
System.out.print("\n");
}
}
}
//PIRAMID3 

package com.swain.cell;

public class Piramid3 {

public static void main(String args[]){

int i,j;

for(i=1;i<=5;i++)

{

for(j=1;j<=i;j++)

System.out.print(" "+j);

System.out.print("\n");

}

for(i=4;i>=1;i--)

{

for(j=1;j<=i;j++)

System.out.print(" "+j);

System.out.print("\n");

}

}

}

//PIRAMID4

package com.swain.cell;

public class Piramid4 {

public static void main(String args[]){

int i,k,j;

for(i=1;i<=200;i= i*2){

for(j=1; j<=i; j=j*2)

System.out.print(j + " ");

for(k=i/2; k>=1; k=k/2)

System.out.print( k + " ");

System.out.print("\n");

}

}

}

//PRIME NO IN JAVA

package com.swain.cell;

public class Prime {

public static void main(String args[])

  {

     int n, status = 1, num = 3;

n=5;

     if ( n >= 1 )

     {

        System.out.println("prime numbers are: ");

        System.out.println(2);

     }

 

     for ( int count = 2 ; count <=n ;  )

     {

        for ( int j = 2 ; j <= Math.sqrt(num) ; j++ )

        {

           if ( num%j == 0 )

           {

              status = 0;

              break;

           }

        }

        if ( status != 0 )

        {

           System.out.println(num);

           count++;

        }

        status = 1;

        num++;

     }         

  }

}

//STRING PALIDROM IN JAVA

package com.swain.cell;

public class StringPalindrome {

public static void main(String args[])

  {

     String original="1001";

     String rev="";

           

     int length = original.length();

 

     for ( int i = length - 1 ; i >= 0 ; i-- )

        rev = rev + original.charAt(i);

 

     if (original.equals(rev))

        System.out.println(original+" is a palindrome.");

     else

        System.out.println(original+" is not a palindrome.");

 

  }

}