23. Christmas tree.

class ChristmasTree
{
public static final int segments = 4;
public static final int height = 4;

public static void main(String[] args)
{
makeTree();
}

public static void makeTree()
{
int maxStars = 2 * height + 2 * segments - 3;
String maxStr = "";
for (int l = 0; l < maxStars; l++)
{
maxStr += " ";
}

for (int i = 1; i <= segments; i++)
{
for (int line = 1; line <= height; line++)
{
String starStr = "";
for (int j = 1; j <= 2 * line + 2 * i - 3; j++)
{
starStr += "*";
}

for (int space = 0; space <= maxStars - (height + line + i); space++)
{
starStr = " " + starStr;
}
System.out.println(starStr);
}
}

for (int i = 0; i <= maxStars / 2; i++)
{
System.out.print(" ");
}

System.out.println(" " + "*" + " ");

for (int i = 0; i <= maxStars / 2; i++)
{
System.out.print(" ");
}

System.out.println(" " + "*" + " ");

for (int i = 0; i <= maxStars / 2 - 3; i++)
{
System.out.print(" ");
}

System.out.println(" " + "*******");
}
}

@java_Codings

24. Christmas tree pattern
X
X
XXX
X
XXXXX
X
XXX
XXXXXX

class ChristmasTreePattern
{
public static void main(String[] arg)
{
drawChristmasTree(4);
}

private static void drawChristmasTree(int n)
{
for (int i = 0; i < n; i++)
{
triangle(i + 1, n);
}
}

private static void triangle(int n, int max)
{
for (int i = 0; i < n; i++)
{
for (int j = 0; j < max - i - 1; j++)
{
System.out.print(" ");
}

for (int j = 0; j < i * 2 + 1; j++)
{
System.out.print("X");
}

System.out.println("");
}
}
}

@java_codings

25. Floyd Triangle
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
import java.util.Scanner;

class FloydTriangle
{
public static void main(String args[])
{
int n, num = 1, c, d;
Scanner in = new Scanner(System.in);

System.out.print("Enter the number of rows of floyd's triangle : ");
n = in.nextInt();

System.out.println("Floyd's triangle :-");

for (c = 1; c <= n; c++)
{
for (d = 1; d <= c; d++)
{
System.out.print(num + " ");
num++;
}

System.out.println();
}
}
}

@java_codings

26. Number pattern 1.

1
12
123
1234
12345

class NumberPat1
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{

for (int j = 1; j <= i; j++)
{

System.out.print(j);

}

System.out.println();
}
}
}

@java_codings

27. Number pattern 2.

54321
5432
543
54
5

class NumberPat2
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{

for (int j = 5; j >= i; j--)
{

System.out.print(j);

}

System.out.println();
}
}
}

@java_codings

28. Number pattern 3.

12345
1234
123
12
1

class NumberPat3
{

public static void main(String arg[])
{

for (int i = 1, r = 5; i <= 5; i++, r--)
{

for (int j = 1; j <= r; j++)
{

System.out.print(j);

}

System.out.println();
}
}
}

@java_codings

29. Number pattern 4.

1
12
123
1234
12345
1234
123
12
1

class NumberPat4
{

public static void main(String arg[])
{

int ck = 0, c = 2;

while (c > 0)
{

if (ck == 0)
{

for (int i = 1; i <= 5; i++)
{

for (int j = 1; j <= i; j++)
{

System.out.print(j);

}

System.out.println();

}

ck++;

}
else
{

for (int i = 1, r = 5 - 1; i <= 5 - 1; i++, r--)
{

for (int j = 1; j <= r; j++)
{

System.out.print(j);

}

System.out.println();
}
}

c--;
}

}
}

@java_codings

30. Number pattern 5.

12345
1234
123
12
1
12
123
1234
12345

class NumberPat5
{

public static void main(String arg[])
{

int ck = 0, c = 2;

while (c > 0)
{

if (ck == 0)
{

for (int i = 1, r = 5; i <= 5; i++, r--)
{

for (int j = 1; j <= r; j++)
{

System.out.print(j);

}

System.out.println();

}

ck++;

}
else
{

for (int i = 2; i <= 5; i++)
{

for (int j = 1; j <= i; j++)
{

System.out.print(j);

}

System.out.println();
}
}

c--;
}

}
}

@java_codings

31. Number pattern 6.

1
22
333
4444
55555

class NumberPat6
{

public static void main(String arg[])
{

for(int i=1;i<=5;i++)
{
for(int j=1;j<=i;j++)
{
System.out.print(i);
}

System.out.println();
}
}
}

@java_codings

32. Number pattern 7.

1
23
456
7890
12345

class NumberPat7
{

public static void main(String arg[])
{

int t = 1;
for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)
{
if (t == 10)
t = 0;
System.out.print(t++);
}
System.out.println();
}
}
}

@java_codings

33. Number pattern 8.

5
11111
0000
111
00
1

import java.util.Scanner;

class Pattern
{
public static void main(String args[])
{
int n, i, j;
Scanner sc = new Scanner(System.in);

System.out.println("Enter the number of rows ");
n = sc.nextInt();

for (i = 1; i <= n; i++)
{
for (j = i; j <= n; j++)
{
if (i % 2 == 0)
System.out.print("0");
else
System.out.print("1");
}
System.out.println();
}
}
}

@java_codings

34. Number pattern 9.

1
1 2 1
1 2 3 2 1
1 2 3 4 3 2 1
1 2 3 4 5 4 3 2 1

class PrintPattern
{
public static void main(String args[])
{
int n = 5;
for (int i = 1; i <= n; i++)
{
int j = n - i;
while (j > 0)
{
System.out.print(" ");
j--;
}

j = 1;
while (j <= i)
{
System.out.print(" " + j);
j++;
}

j = i - 1;
while (j > 0)
{
System.out.print(" " + j);
j--;
}

j = n - i;
while (j > 0)
{
System.out.print(" ");
j--;
}
System.out.println();
}
}
}

@java_codings

35. Number pattern 10.


1
121
12321
1234321
123454321
12345654321
1234567654321

import java.util.*;

class Pattern
{
public static void main(String[] args)
{
int i, j, k = 1, l, n;
Scanner sc = new Scanner(System.in);

System.out.println("Enter the number of levels of pattern");
n = sc.nextInt();

System.out.println("\nPattern is : \n");

for (i = 1; i <= n; i++)
{
l = i;

for (j = 1; j <= k; j++)
{
if (j >= i + 1)
{
System.out.print(--l);
}

else
{
System.out.print(j);
}
}

k = k + 2;
System.out.println(" ");
}
}
}

@java_codings

36. Star Pattern 1.
****
***
**
*

class StarPattern1
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{

for (int j = i; j <= 5; j++)

{

System.out.print("*");

}

System.out.println();
}
}
}

@java_codings

37. Star Pattern.
*
**
***
****
*****

class StarPattern2
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)

{
System.out.print("*");
}

System.out.println();
}
}
}

@java_codings

38. Star Pattern 3.

class StarPattern3
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{
for (int j = i; j <= 5; j++)

{
System.out.print("*");
}

System.out.println();
}

for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)

{
System.out.print("*");
}

System.out.println();
}

}
}

@java_codings

39. Star Pattern 4.


**
****
******
********
**********

class StarPattern4
{

public static void main(String arg[])
{

int num = 12;
int f = 2;
int g = num - 1;

for (int i = 1; i <= (num / 2); i++)
{

for (int j = 1; j <= num; j++)
{

if (j >= f && j <= g)
{

System.out.print(" ");

}
else
{

System.out.print("*");

}
}

f = f + 1;
g = g - 1;

System.out.println();
}
}
}

@java_codings

40. Star Pattern 5.

class StarPattern5
{

public static void main(String arg[])
{

for (int i = 1; i <= 5; i++)
{

for (int j = 1; j <= i; j++)

{
System.out.print("*");
}

System.out.println();
}

for (int i = 1; i <= 5; i++)
{

for (int j = i; j <= 5; j++)

{
System.out.print("*");
}

System.out.println();
}
}
}

@java_codings

41. Triangle Pattern.

import java.io.*;

class Triangle
{
public static void main(String arg[])
{
InputStreamReader istream = new InputStreamReader(System.in);
BufferedReader read = new BufferedReader(istream);
System.out.println("Enter Triangle Size : ");
int num = 0;
try
{
num = Integer.parseInt(read.readLine());
}
catch (Exception Number)
{
System.out.println("Invalid Number!");
}

for (int i = 1; i <= num; i++)
{
for (int j = 1; j < num - (i - 1); j++)
{
System.out.print(" ");
}

for (int k = 1; k <= i; k++)
{
System.out.print("*");
for (int k1 = 1; k1 < k; k1 += k)
{

System.out.print("*");
}
}

System.out.println();
}
}
}

@java_codings