In this tutorial, we are going to write some pattern programs in java programming with practical program code and step-by-step full complete explanation.
First pattern program
class Pattern8
{
public static void main(String args[])
{
int n, c, k, space, count = 1;
space =n=5;
for (c = 1; c <= n; c++)
{
for (k = 1; k < space; k++)
System.out.print(" ");
for (k = 1; k <= c; k++) {
System.out.print("*");
if (c > 1 && count < c)
{
System.out.print("A");
count++;
}
}
System.out.print("\n");
space--;
count = 1;
}
}
}
Output
*
*A*
*A*A*
*A*A*A*
*A*A*A*A*
Second pattern program.
class Pattern9
{
public static void main(String args[])
{
int rows, i, j, number= 1;
rows=4;
for(i=1; i <= rows; i++)
{
for(j=1; j <= i; ++j)
{
System.out.print(number);
++number;
}
System.out.print("\n");
}
}
}
Output
1 23 456 78910
Third pattern program.
class Pattern10
{
public static void main(String args[])
{
int rows, c = 1, space, i, j;
rows=5;
for(i=0; i<rows; i++)
{
for(space=1; space <= rows-i; space++)
{
System.out.print(" ");
}
for(j=0; j<=i; j++)
{
if (j==0 || i==0)
c = 1;
else
c = c*(i-j+1)/j;
System.out.print(" "+c);
}
System.out.print("\n");
}
}
}
Output
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
Fourth pattern program.
class Pattern11
{
public static void main(String args[])
{
int i, space, rows, k=0, count = 0, count1 = 0;
rows=5;
for(i=1; i<=rows; ++i)
{
for(space=1; space <= rows-i; ++space)
{
System.out.print(" ");
++count;
}
while(k != 2*i-1)
{
if (count <= rows-1)
{
System.out.print(" "+(i+k));
++count;
}
else
{
++count1;
System.out.print(" "+(i+k-2*count1));
}
++k;
}
count1 = count = k = 0;
System.out.print("\n");
}
}
}
Output
1
2 3 2
3 4 5 4 3
4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5Fifth pattern program.
class Pattern13
{
public static void main(String args[])
{
for (int i=1; i<=5; i++)
{
for (int j=5; j>=i; j--)
{
System.out.print(" ");
}
for (int k=1; k<=i; k++)
{
System.out.print("*");
}
System.out.print("\n");
}
}
}
Output
*
**
***
****
*****Sixth pattern program.
class Pattern14
{
public static void main(String args[])
{
int i,j,k,sp=1;
for (i=5; i>=1; i--)
{
for (k=sp; k>=0; k--)
{
System.out.print(" ");// only 1 space
}
for (j=i; j>=1; j--)
{
System.out.print("*");
}
sp = sp + 1;
System.out.print("\n");
}
}
}
Output
*****
****
***
**
*Seventh pattern program.
class Pattern15
{
public static void main(String args[])
{
int i,j,k,sp=1;
for (i=1; i<=5; i++)
{
for (k=sp; k<=5; k++)
{
System.out.print(" ");
}
for (j=0; j< i; j++)
{
System.out.print("*");
}
sp = sp + 1;
System.out.print("\n");
}
sp = 1;
for (i=4; i>=1; i--)
{
for (k=sp; k>=0; k--)
{
System.out.print(" ");
}
for (j=i; j>=1; j--)
{
System.out.print("*");
}
sp = sp + 1;
System.out.print("\n");
}
}
}
Output
*
* *
* * *
* * * *
* * * * *
* * * *
* * *
* *
*Eight pattern program.
class Pattern16
{
public static void main(String args[])
{
int i, j=5, k, x;
for (i=1;i<=5;i++)
{
for (k=1;k<=j;k++)
{
System.out.print(" ");
}
for (x=1;x<=i;x++)
{
System.out.print(i);
System.out.print(" ");
}
System.out.print("\n");
j=j-1;
}
}
}
Output
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5Ninth pattern program.
class Pattern17
{
public static void main(String args[])
{
int i,j,k;
for (i=1;i<=5;i++)
{
for (j=5;j>=1;j--)
{
if(j<=i)
System.out.print(j);
else
System.out.print(" ");
}
System.out.print("\n");
}
}
}
Output
1
21
321
4321
54321Ten pattern program.
class Pattern18
{
public static void main(String args[])
{
int i,j,k;
for (i=1;i<=5;i++)
{
for (j=1;j<=5;j++)
{
if(j<=i)
System.out.print(j);
else
System.out.print(" ");
}
for (j=5;j>=1;j--)
{
if(j<=i)
System.out.print(j);
else
System.out.print(" ");
}
System.out.print("\n");
}
}
}
Output
1 1
12 21
123 321
1234 4321
1234554321
Eleven pattern program.
class Pattern19
{
public static void main(String args[])
{
int i,j,k;
for (i=1;i<=5;i++)
{
j=i;
for (k=1;k<=i;k++)
{
System.out.print(j++);
}
System.out.print("\n");
}
}
}
Output
1
23
345
4567
56789
Twelve pattern program.
class Pattern20
{
public static void main(String args[])
{
int i,j;
for (i=1;i<=4;i++)
{
for (j=i;j>1;j--)
System.out.print(j);
for (j=1;j<=i;j++)
System.out.print(j);
System.out.print("\n");
}
}
}
Output
1 212 32123 4321234
Thirteen pattern program.
class Pattern21
{
public static void main(String args[])
{
int i,j;
for (i=1;i<=5;i++)
{
for (j=1;j<=5;j++)
{
if(j==5 || j==1 || i==1 || i==5)
System.out.print("1");
else
System.out.print(" ");
}
System.out.print("\n");
}
}
}
Output
11111 1 1 1 1 1 1 11111
Fourteen pattern program.
class Pattern22
{
public static void main(String args[])
{
int i, j, k;
for (i=1;i<=5;i++)
{
for (j=i;j<5;j++)
{
System.out.print(" ");
}
for (k=1;k<(i*2);k++)
{
System.out.print(k);
}
System.out.print("\n");
}
for (i=4;i>=1;i--)
{
for (j=5;j>i;j--)
{
System.out.print(" ");
}
for (k=1;k<(i*2);k++)
{
System.out.print(k);
}
System.out.print("\n");
}
}
}
Output
1
123
12345
1234567
123456789
1234567
12345
123
1Fifteen pattern program.
class Pattern23
{
public static void main(String args[])
{
int i,j;
for (i=1;i<=10;i++)
{
for (j=1;j<=i;j++)
{
System.out.print(i*j);
}
System.out.print("\n");
}
}
}
Output
1 24 369 481216 510152025 61218243036 7142128354249 816243240485664 91827364554637281 102030405060708090100
Sixteen pattern program.
class Pattern25
{
public static void main(String args[])
{
int i, j, rows;
/* Input number of rows from user */
rows=8;
for(i=1; i<=rows; i++)
{
/* Print trailing spaces */
for(j=1; j<=rows-i; j++)
{
System.out.print(" ");
}
/* Print stars and center spaces */
for(j=1; j<=rows; j++)
{
if(i==1 || i==rows || j==1 || j==rows)
System.out.print("*");
else
System.out.print(" ");
}
System.out.print("\n");
}
}
}
Output
********
* *
* *
* *
* *
* *
* *
********
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