The document provides steps to write a Java program that prints different star patterns. It starts with a basic pattern of increasing numbers of stars per line. It then expands on this with examples of printing patterns forwards and backwards, with and without spaces, and with single or double stars on the edges. The full code for each pattern example is included. The overall goal is to demonstrate how to systematically create nested for loops to control the number of rows and columns/characters to achieve different geometric patterns of output.

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Write a program to print following pattern
*
**
***
****
*****
Step 1: Draw the given pattern in box
*
* *
* * *
* * * *
* * * * *
Step 2: For each row assign a variable i with the row number. For
example: here we will assign i=1 for first row, i=2 for second row and so
on.
* i=1
* * i=2
* * * i=3
* * * * i=4
* * * * * i=5
So partial code becomes like:
for(int i=1;i<=5;i++)
{
System.out.println();
}
This will generate 5 rows.

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Step 3: For each row assign a variable j for stars. For example: here we
will assign j=1 for first row as first row has one star, j=2 for second row
as second row has 2 stars and so on.
* i=1 j=1
* * i=2 j=2
* * * i=3 j=3
* * * * i=4 j=4
* * * * * i=5 j=5
Step 4: Find the relation between i and j i.e. when i=1 j must be equal to
1, when i=2 j must be equal to 2 and so on
So we derive a relation that:
j=i
So we will make this in the form of for loop as:
for(int j=1;j<=i;j++)
So our code become:
for(int i=1;i<=5;i++)
{
for(int j=1;j<=i;j++)
System.out.print(“*”);
System.out.println();
}

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Step 5: Replace the 5 with n:
So our code become:
for(int i=1;i<=n;i++)
{
for(int j=1;j<=i;j++)
System.out.print(“*”);
System.out.println();
}
Program:
class Star
{
public static void main(String args[ ])
{
int n=5;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=i;j++)
System.out.print("*");
System.out.println();
}
}
}

4. Visit http://gsb-programming.blogspot.in/
Write a program to print following pattern
*****
****
***
**
*
* * * * * i=1 j=5
* * * * i=2 j=4
* * * i=3 j=3
* * i=4 j=2
* i=5 j=1
class Star
{
public static void main(String args[ ])
{
int n=5;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n-i+1;j++)
System.out.print("*");
System.out.println();
}
}
}

5. Visit http://gsb-programming.blogspot.in/
Write a program to print following pattern
*
**
***
****
*****
****
***
**
*
class Star
{
public static void main(String args[])
{
int n=5; int k=1;
for(int i=1;i<=n&&i>=1;i=i+k)
{
for(int j=1;j<=i;j++)
{
System.out.print("*");
if(j==n)
k=-1;
}
System.out.println();
}
}
}
* i=1 j=1
* * i=2 j=2
* * * i=3 j=3
* * * * i=4 j=4
* * * * * i=5 j=5
* * * * i=4 j=4
* * * i=3 j=3
* * i=2 j=2
* i=1 j=1

6. Visit http://gsb-programming.blogspot.in/
Write a program to print following pattern
*
***
*****
*******
*********
class Star
{
public static void main(String args[ ])
{
int n=5;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n-i+1;j++)
System.out.print(" ");
for(int k=1;k<=2*i-1;k++)
System.out.print("*");
System.out.println();
}
}
}
* i=1 j=4 k=1
* * * i=2 j=3 k=3
* * * * * i=3 j=2 k=5
* * * * * * * i=4 j=1 k=7
* * * * * * * * * i=5 j=0 k=9

7. Visit http://gsb-programming.blogspot.in/
Write a program to print following pattern
*********
*******
*****
***
*
class Star
{
public static void main(String args[ ])
{
int n=5;
for(int i=n;i>=1;i--)
{
for(int j=n;j >i;j--)
System.out.print(" ");
for(int k=1;k<=2*i-1;k++)
System.out.print("*");
System.out.println();
}
}
}
* * * * * * * * * i=5 j=0 k=9
* * * * * * * i=4 j=1 k=7
* * * * * i=3 j=2 k=5
* * * i=2 j=3 k=3
* i=1 j=4 k=1

8. Visit http://gsb-programming.blogspot.in/
Write a program to print following pattern
class Star
{
public static void main(String args[ ])
{
int n=5;
int m=1;
for(int i=1;i<=n&&i>=1;i=i+m)
{
for(int j=1;j <=n-i+1;j++)
System.out.print(" ");
for(int k=1;k<=2*i-1;k++)
System.out.print("*");
if(i==n)
m=-1;
System.out.println();
}
}
}
* i=1 j=4 k=1
* * * i=2 j=3 k=3
* * * * * i=3 j=2 k=5
* * * * * * * i=4 j=1 k=7
* * * * * * * * * i=5 j=0 k=9
* * * * * * * i=4 j=1 k=7
* * * * * i=3 j=2 k=5
* * * i=2 j=3 k=3
* i=1 j=4 k=1

9. Visit http://gsb-programming.blogspot.in/
Write a program to print following pattern
class Star
{
public static void main(String args[ ])
{
int n=5;
int m=1;
for(int i=1;i<=n&&i>=1;i=i+m)
{
for(int j=1;j <=n-i+1;j++)
System.out.print(" ");
for(int k=1;k<=2*i-1;k++)
if(k==1||k==2*i-1)
System.out.print("*");
else
System.out.print(" ");
* i=1 j=4 k=1
* * i=2 j=3 k=2
* * i=3 j=2 k=2
* * i=4 j=1 k=2
* * i=5 j=0 k=2
* * i=4 j=1 k=2
* * i=3 j=2 k=2
* * i=2 j=3 k=2
* i=1 j=4 k=1

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if(i==n)
m=-1;
System.out.println();
}
}