Programming In Java.

String Reverse Program In Java.

Code:-
import java.util.Scanner;
class Reverse
{
public static void main(String[] s)
{
Scanner sc=new Scanner(System.in);
String str=sc.nextLine();
for(int i=str.length()-1;i>=0;i--)
{
System.out.print(str.charAt(i));
}
}
}

Palindrome Number Program In Java.

Code:-

import java.util.Scanner;

class Palindrome

{

static int temp,num,rnum=0,digit;

public static void main(String[] s)

{

Scanner sc=new Scanner(System.in);

num=sc.nextInt();

temp=num;

do

{

digit=temp%10;

temp=temp/10;

rnum=rnum*10+digit;

}

while(temp>0);

if(rnum==num)

{

System.out.println("Number is palindrome");

}

else

{

System.out.println("Number is not palindrome");

}

}

}

Armstrong Number Program In Java

Code:-

import java.util.Scanner;

class Armstrong

{

static int temp,num,rnum=0,digit;

public static void main(String[] s)

{

Scanner sc=new Scanner(System.in);

num=sc.nextInt();

temp=num;

do

{

digit=temp%10;

temp=temp/10;

rnum=rnum+digit*digit*digit;

}

while(temp>0);

if(rnum==num)

{

System.out.println("Number is Armstrong:");

}

else

{

System.out.println("Number is not Armstrong:");

}

}

}

Star Pattern Program in Java

*

* *

* * *

* * * *

* * * * *

* * * * * *

First Way : 

Code : - 

class Pattern

{

           public static void main(String[] s)

{

for(int i=0;i<6;i++)

{

for(int j=0;j<=i;j++)

{

System.out.print("*");

}

System.out.println();

}

}

}

Second Way : 

Code : - 

import java.util.Scanner;

 class Pattern

{

public static void main(String[] s)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number:");

int num = sc.nextInt();

System.out.println("Number is = "+num);

for(int i=0;i<num;i++)

{

for(int j=0;j<=i;j++)

{

System.out.print("*");

}

System.out.println();

}

}

}

* * * * * *

* * * * *

* * * *

* *

*

Code : - 

import java.util.Scanner;

class Pattern
{

public static void main(String[] s)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number:");

int num = sc.nextInt();

System.out.println("Number is = "+num);

for(int i=0;i<num;i++)

{

for(int j=0;j<num-i;j++)

{

System.out.print("*");

}

System.out.println();

}

}

}

               *

            * * *

          * * * * *

        * * * * * * *

      * * * * * * * * *

    * * * * * * * * * * *

 * * * * * * * * * * * * *

Code:-

import java.util.Scanner;

class Pattern

{

public static void main(String[] s)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number:");

int n = sc.nextInt();

for(int i=0;i<n;i=i+2)

{

for(int j=0;j<n-1-i;j++)

{

System.out.print(" ");

}

for(int k=0;k<=i;k++)

{

System.out.print("* ");

}

System.out.println();

}

}

}

         * *

      * * * *

    * * * * * *

  * * * * * * * *

* * * * * * * * * *

Code :-

import java.util.Scanner;

class Pattern

{

public static void main(String[] s)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number:");

int n = sc.nextInt();

for(int i=0;i<n;i=i+2)

{

for(int j=0;j<n-1-i;j++)

{

System.out.print(" ");

}

for(int k=0;k<=1+i;k++)

{

System.out.print("* ");

}

System.out.println();

}

}

}

*

**

***

****

*****

****

***

**

*

import java.util.Scanner;

class Pattern

{

public static void main(String[] s)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number:");

int num = sc.nextInt();

System.out.println("Number is = "+num);

for(int i=0;i<num;i++)

{

for(int j=0;j<=i;j++)

{

System.out.print("*");

}

System.out.println();

}

for(int i=0;i<num;i++)

{

for(int j=0;j<num-i-1;j++)

{

System.out.print("*");

}

System.out.println();

}

}

}

            *

        *  *

    *  *  *

 * *  *  *

Code: -

import java.util.Scanner;

class Pattern

{

public static void main(String[] s)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number:");

int num = sc.nextInt();

System.out.println("Number is = "+num);

for(int i=0;i<num;i++)

{

for(int j=0;j<num-i-1;j++)

{

System.out.print(" ");

}

for(int k=0;k<=i;k++)

{

System.out.print("*");

}

System.out.println();

}

}

}

*  *  *  *  *

    *  *  *  *

       *   *  *

            *  *

                *

Code :-

import java.util.Scanner;

class Pattern

{

public static void main(String[] s)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number:");

int num = sc.nextInt();

System.out.println("Number is = "+num);

for(int i=num;i>0;i--)

{

for(int j=0;j<num-i;j++)

{

System.out.print(" ");

}

for(int k=0;k<=i-1;k++)

{

System.out.print("*");

}

System.out.println();

}

}

}

      *

    ***

   *****

  *******

*********

  *******

   *****

     ***

       *

Code:-

import java.util.Scanner;

 class Pattern

{

public static void main(String[] s)

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number:");

int number = sc.nextInt();

for (int i=1; i<=number; i++)

            {

for (int j=0; j<(number-i); j++)

{

                        System.out.print(" ");

}

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

{

                        System.out.print("*");

}

                    for (int k=1; k<i; k++)

{

                        System.out.print("*");

}

                                         System.out.println();

                              }

                              for (int i=number-1; i>=1; i--)

                              {

                for (int j=0; j<(number-i); j++)

{

                        System.out.print(" ");

}

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

{

                        System.out.print("*");

}

                  for (int k=1; k<i; k++)

{

                        System.out.print("*");

}

                                           System.out.println();

                                 }

}

}