The document provides Java implementations for printing various patterns, including simple pyramids, reversed pyramids, triangles, and number patterns. Each section of code demonstrates how to generate specific patterns using nested loops and prints the results to the console. It covers both star patterns and numeric patterns, showcasing different approaches to handling output formatting.

1. Programs for printing pyramid patterns in Java
This article is aimed at giving a Java implementation for pattern printing.
Simple pyramid pattern
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import java.io.*;
// Java code to demonstrate star patterns
public class My_Class
{
// Function to demonstrate printing pattern
public static void printStars(int n)
{
int i, j;
// outer loop to handle number of rows
// n in this case
for(i=0; i<n; i++)
{
// inner loop to handle number of columns
// values changing acc. to outer loop
for(j=0; j<=i; j++)
{

2. // printing stars
System.out.print("* ");
}
// ending line after each row
System.out.println();
}
}
// Driver Function
public static void main(String args[])
{
int n = 5;
printStars(n);
}
}
Output:
*
* *
* * *
* * * *
* * * * *
After 180 degree rotation

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import java.io.*;
// Java code to demonstrate star pattern
public class My_Class
{
// Function to demonstrate printing pattern
public static void printStars(int n)
{
int i, j;
// outer loop to handle number of rows
// n in this case
for(i=0; i<n; i++)
{
// inner loop to handle number spaces
// values changing acc. to requirement
for(j=2*(n-i); j>=0; j--)
{
// printing spaces
System.out.print(" ");
}

4. // inner loop to handle number of columns
// values changing acc. to outer loop
for(j=0; j<=i; j++)
{
// printing stars
System.out.print("* ");
}
// ending line after each row
System.out.println();
}
}
// Driver Function
public static void main(String args[])
{
int n = 5;
printStars(n);
}
}
Output:
*
* *
* * *
* * * *
* * * * *
Printing Triangle

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import java.io.*;
// Java code to demonstrate star pattern Print Star pattern in Java
public class My_Class
{
// Function to demonstrate printing pattern
public static void printTriagle(int n)
{
// outer loop to handle number of rows
// n in this case
for (int i=0; i<n; i++)
{
// inner loop to handle number spaces
// values changing acc. to requirement
for (int j=n-i; j>1; j--)
{
// printing spaces
System.out.print(" ");
}
// inner loop to handle number of columns
// values changing acc. to outer loop

6. for (int j=0; j<=i; j++ )
{
// printing stars
System.out.print("* ");
}
// ending line after each row
System.out.println();
}
}
// Driver Function
public static void main(String args[])
{
int n = 5;
printTriagle(n);
}
}
Output:
*
* *
* * *
* * * *
* * * * *
Number Pattern
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7. edit
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import java.io.*;
// Java code to demonstrate number pattern
public class My_Class
{
// Function to demonstrate printing pattern
public static void printNums(int n)
{
int i, j,num;
// outer loop to handle number of rows
// n in this case
for(i=0; i<n; i++)
{
// initialising starting number
num=1;
// inner loop to handle number of columns
// values changing acc. to outer loop
for(j=0; j<=i; j++)
{
// printing num with a space
System.out.print(num+ " ");
//incrementing value of num

8. num++;
}
// ending line after each row
System.out.println();
}
}
// Driver Function
public static void main(String args[])
{
int n = 5;
printNums(n);
}
}
Output:
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
Numbers without re assigning
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import java.io.*;
// Java code to demonstrate star pattern
public class My_Class
{
// Function to demonstrate printing pattern
public static void printNums(int n)
{
// initialising starting number
int i, j, num=1;
// outer loop to handle number of rows
// n in this case
for(i=0; i<n; i++)
{
// without re assigning num
// num = 1;
for(j=0; j<=i; j++)
{
// printing num with a space
System.out.print(num+ " ");
// incrementing num at each column
num = num + 1;
}
// ending line after each row

10. System.out.println();
}
}
// Driver Function
public static void main(String args[])
{
int n = 5;
printNums(n);
}
}
Output:
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15