Java program to print the right half star pyramid pattern
KW.java
class KW
{
    public static void main(String args[])
    {
        int i,j;
        for(i=1;i<=10;i++)
        {
            for(j=1;j<=i;j++)
            {
                System.out.print("*");
            }
            System.out.println("");
        }

        /*
        for(i=10;i>=1;i--)
        {
            for(j=10;j>=i;j--)
            {
                System.out.print((char)42);
            }
            System.out.println("");
        }
        */
    }
}
Output
kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
*
**
***
****
*****
******
*******
********
*********
**********
kodingwindow@kw:~$
Java program to print the left half star pyramid pattern
KW.java
class KW
{
    public static void main(String args[])
    {
        int i,j;
        for(i=1;i<=10;i++)
        {
            for(j=1;j<=10-i;j++)
                System.out.print(" ");
                for(j=1;j<=i;j++)
                {
                    System.out.print("*");
                }
                System.out.print("\n");
        }
    }
}
Output
kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********
kodingwindow@kw:~$
Java program to print the inverted right half star pyramid pattern
KW.java
class KW
{
    public static void main(String args[])
    {
        int i,j;
        for(i=10;i>=1;i--)
        {
            for(j=1;j<=i;j++)
            {
                System.out.print("*");
            }
            System.out.println("");
        }
    }
}
Output
kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
**********
*********
********
*******
******
*****
****
***
**
*
kodingwindow@kw:~$
Java program to print the inverted left half star pyramid pattern
KW.java
class KW
{
    public static void main(String args[])
    {
        int i,j;
        for(i=10;i>=1;i--)
        {
            for(j=1;j<=10-i;j++)
                System.out.print(" ");
                for(j=1;j<=i;j++)
                {
                    System.out.print("*");
                }
                System.out.print("\n");
        }
    }
}
Output
kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
**********
 *********
  ********
   *******
    ******
     *****
      ****
       ***
        **
         *
kodingwindow@kw:~$
Java program to print the half star pyramid pattern
KW.java
class KW
{
    public static void main(String args[])
    {
        int i,j;
        for(i=1;i<=10;i++)
        {
            for(j=1;j<=10-i;j++)
                System.out.print(" ");
                for(j=1;j<=i;j++)
                {
                    System.out.print("*"+" ");
                }
                System.out.print("\n");
        }
    }
}
Output
kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
         * 
        * * 
       * * * 
      * * * * 
     * * * * * 
    * * * * * * 
   * * * * * * * 
  * * * * * * * * 
 * * * * * * * * * 
* * * * * * * * * * 
kodingwindow@kw:~$
Java program to print the inverted half star pyramid pattern
KW.java
class KW
{
    public static void main(String args[])
    {
        int i,j;
        for(i=10;i>=1;i--)
        {
            for(j=1;j<=10-i;j++)
                System.out.print(" ");
                for(j=1;j<=i;j++)
                {
                    System.out.print("*"+" ");
                }
                System.out.print("\n");
        }
    }
}
Output
kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
* * * * * * * * * * 
 * * * * * * * * * 
  * * * * * * * * 
   * * * * * * * 
    * * * * * * 
     * * * * * 
      * * * * 
       * * * 
        * * 
         * 
kodingwindow@kw:~$
Java program to print the diamond star pyramid pattern
KW.java
class KW
{
    public static void main(String args[])
    {
        int i,j;
        for(i=1;i<=10;i++)
        {
            for(j=1;j<=10-i;j++)
                System.out.print(" ");
                for(j=1;j<=i;j++)
                {
                    System.out.print("*"+" ");
                }
                System.out.print("\n");
        }

        for(i=9;i>=1;i--)
        {
            for(j=1;j<=9-i;j++)
                System.out.print(" ");
                for(j=1;j<=i;j++)
                {
                    System.out.print(" *");
                }
                System.out.print("\n");
        }
    }
}
Output
kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
         * 
        * * 
       * * * 
      * * * * 
     * * * * * 
    * * * * * * 
   * * * * * * * 
  * * * * * * * * 
 * * * * * * * * * 
* * * * * * * * * * 
 * * * * * * * * *
  * * * * * * * *
   * * * * * * *
    * * * * * *
     * * * * *
      * * * *
       * * *
        * *
         *
kodingwindow@kw:~$
Java program to print the pyramid pattern using natural numbers
KW.java
class KW
{
    public static void main(String args[])
    {
        int k=1;
        for(int i=1;i<10;i++)
        {
            for(int j=1;j<=i;j++,k++)
            {
                System.out.print(k+" ");
            }
            System.out.println(" ");
        }
    }
}
Output
kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
1  
2 3  
4 5 6  
7 8 9 10  
11 12 13 14 15  
16 17 18 19 20 21  
22 23 24 25 26 27 28  
29 30 31 32 33 34 35 36  
37 38 39 40 41 42 43 44 45  
kodingwindow@kw:~$
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Java program to find the factorial of a given number Java Strings
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