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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; iJava Tips and Tutorials

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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:

—-*–

—*-*–

–*-*-*–

-*-*-*-*–

–*-*-*–

—*-*–

—-*–

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Sample Output 3:

Enter a number: 5

The shape for this is:

—–*–

—-*-*–

—*-*-*–

–*-*-*-*–

-*-*-*-*-*–

–*-*-*-*–

—*-*-*–

—-*-*–

—–*–

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