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Java Source Code: A Recursive Asterisk Diamond Shape Program

Updated on October 31, 2013

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Below is the Java source code on getting a diamond shape of asterisks using recursion. Recursion is way that repeat the codes over and over until the condition is met. It is like the for, while and do-while loops. This program I made on outputting a diamond shape asterisk prompts for the user to enter the number and the program will output the asterisks in diamond shape. The size of the diamond depends on the number that the user will enter. You can study and trace the code below.



Java Source Code: A Recursive Asterisk Diamond Shape

//java class


public class Diamond
{
    public String Diamond_Asterisk(int num) //method1
    {
        if(num>0)
        {
            return "*-" + Diamond_Asterisk(num-1);
        }
        else
        {
            return "-";
        }
    }
     public String Diamond_Asterisk2(int num)//method2
    {
        if(num>0)
        {
            return "-*-" + Diamond_Asterisk(num-1);//access method1
        }
        else
        {
            return "-";
        }
    }

    public String Space(int num) //method3
    {
        if(num>0)
        {
            return "-" + Space(num-1);
        }
        else
        {
            return "-";
        }
    }
    public void DiamondResult(int num)//method4
    {
        for(int i=1; i<num; i++)
        {
            System.out.print(Space(num-i));//access method3
             System.out.println(Diamond_Asterisk(i));//access method1
            
        }
         for(int i=0; i<num; i++)
        {
            System.out.println(Diamond_Asterisk2(num-i));//access method2
            System.out.print(Space(i));//access method3

        }
     
    }
    

}


//main class


import java.util.Scanner;

public class Main {

    public static void main(String[] args) 
    {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter a number: ");
        int num = input.nextInt();

        Diamond access = new Diamond();
        System.out.println("The shape for this is: ");
        access.DiamondResult(num);
        
    }

}

Note: You can revise the program by changing the dashes into spaces, I just use the dash in order to show the diamond shape generated by the program.

Sample Output 1:

Enter a number: 3

The shape for this is:

---*--

--*-*--

-*-*-*--

--*-*--

---*--

Sample Output 2:

Enter a number: 4

The shape for this is:

----*--

---*-*--

--*-*-*--

-*-*-*-*--

--*-*-*--

---*-*--

----*--


Sample Output 3:

Enter a number: 5

The shape for this is:

-----*--

----*-*--

---*-*-*--

--*-*-*-*--

-*-*-*-*-*--

--*-*-*-*--

---*-*-*--

----*-*--

-----*--


Source: facebook.com via google image
Source: facebook.com via google image

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    • alocsin profile image

      alocsin 5 years ago from Orange County, CA

      How fun. I'm going to try this out. There's no max limit on the number? Voting this Up and Useful.

    • aisha91 profile image
      Author

      Rasna Aisha 5 years ago from Manila, Philippines

      hi alocsin,

      Thank you for appreciating, voting and rating it. Yes programming is really fun, there is no maximum number that stopping the program so it is applicable for any number. :)

    • profile image

      WhydThatHappen 5 years ago

      I learned different programming languages and now I'm trying to work with java, wasn't sure what the capabilities and language looked like and started looking into recursion for practical purposes: after much searching I finally found the answer here on hubpages, next time I will search hubpages first! Voting up and sharing

    • dwachira profile image

      [ Danson Wachira ] 5 years ago from Nairobi, Kenya

      Thanks aisha91, you've really taken me years back when we used to have fun with loops. It was enjoyable to instruct the computer to do the same thing again and again, in fact one of my popular lessons remains to be loops. Enjoy your day.

    • aisha91 profile image
      Author

      Rasna Aisha 5 years ago from Manila, Philippines

      Thanks dwachira for your kind comment. It is really fulfilling to share what you know. I've got to visit your Java hubs too, it might teach me new things. Happy hubbing to you, may you enjoy your stay here on hubpages. :)

    • profile image

      ankit 4 years ago

      Thanks for this tutorial ,it will be more nice if u add some java project tutorial,or projects made by you in java that will help a lot for learning

      java a better way.

    • aisha91 profile image
      Author

      Rasna Aisha 4 years ago from Manila, Philippines

      Welcome ankit, I'll try to add more projects if I'll have the luxury of free time in the future. You can visit my other Java programs as well or visit the site in the future for other references and added projects. Have a nice day ahead.

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