User Defined Function in Java

class Pattern1

{

            public void pattr()

              {

                       

                        int counter=1;

                        for(int i=1;i<=4;i++)

                        {

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

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

                                    System.out.println();

                                    counter++;

                        }          

            }

           

            public void pattrn1()

            {

                        for(int i=1;i<=4;i++)

                        {

                                    for(int k=0;k<4-i;k++)

                                                System.out.print(" ");

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

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

                                    System.out.println(" ");                                      

                        }

            }

}

class pattern2

{

            public void pattrn()

              {

                        int counter=1;

                        for(int i=1;i<=4;i++)

                        {

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

                                                System.out.print(" * ");                          

                                    System.out.println();

                                    counter++;

                        }          

            }

            public void pattrn2()

            {

                        for(int i=1;i<=4;i++)

                        {

                                    for(int k=0;k<4-i;k++)

                                                System.out.print(" ");

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

                                                System.out.print(" * ");

                                    System.out.println(" ");              

                        }

            }

}

class pattern3

{

            public void patrn()

              {

                        char c[]={'A','B','C','D'};

                        int counter=0;

                        for(int i=0;i<4;i++)

                        {

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

                                                System.out.print(" " +c[i]);                                 

                                    System.out.println();

                                    counter++;

                        }          

            }

            public void pattrn3()

            {

                        char c[]={'A','B','C','D','E','F','G','H','I','J'};

                        int counter=0;

                        for(int i=0;i<=4;i++)

                        {

                                    for(int k=0;k<4-i;k++)

                                                System.out.print(" ");

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

                                                System.out.print(" "+c[j]);

                                    System.out.println();

                                    counter++;

                        }

            }

}

class Patrn

{

            public static void main(String args[])

            {

                        Pattern1 p1=new Pattern1();

                        p1.pattr();

                        pattern2 p2=new pattern2();

                        p2.pattrn();

                        pattern3 p3=new pattern3();

                        p3.patrn();

                        p1.pattrn1();

                        p2.pattrn2();

                        p3.pattrn3();

            }

}

Output : 

1

23

345

456

*

**

***

****

A

BB

CCC

DDDD

      1

   2    2

3    3    3

4  4  4     4

         *

       *     *

     *    *     *

 *      *    *      * 

         A

       B C

      C D E

     D E F G

   E D G  H  I