Tag: java pattern program

In this tutorial, we will write a program to print an inverted equilateral triangle in java. Before that, you may go through the following topic in java.

• for loop in java

It is a Java Program to Print Reverse Pyramid Star Pattern or you can say upside-down equilateral triangle pattern in java.

The program takes the user input for the number of rows to be taken to print the reverse equilateral star pattern.

Example:

Input: number = 7   
Output:
 *************  
 ***********   
  *********    
   *******     
    *****     
     ***       
      * 

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Java program to print Inverted Equilateral Star Triangle

import java.util.Scanner;

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

    System.out.print("Enter the no. of rows: ");
    num = sc.nextInt();

    for (i = num; i > 0; i--)
    {
      for (j = 0; j < num - i; j++)
      {
        System.out.print(" ");
      }

      for (k = 0; k < i; k++)
      {
        System.out.print("*" + " ");
      }

      System.out.print("\n");
    }
  }
}

Output:

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In this tutorial, we will write a program to print the left triangle star pattern in java. Before that, you may go through the following topic in java.

• for loop in java

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Java Program to Print Left Triangle Star Pattern

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int k = 5, num;
    int i, j;

    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    num = sc.nextInt();

    for (i = 0; i < num; i++)
    {
      for (j = 2 *(num - i); j >= 0; j--)
        System.out.print(" ");

      for (j = 0; j <= i; j++)
        System.out.print("* ");

      System.out.println();
    }
  }
}

Output:

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In this tutorial, we will write a program to print the right triangle star pattern in java. Before that, you may go through the following topic in java.

• for loop in java

It also can be called mirrored right triangle number pattern in java or a half pyramid pattern in java. The program takes a user input for the number of rows and displays it accordingly.

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Java Program to Print Right Triangle Star Pattern

import java.util.Scanner;

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

    System.out.print("Enter the number of rows: ");
    num = sc.nextInt();

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

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

Output:

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In this tutorial, we will write a program to print hollow rectangle pattern in java. Before that, you may go through the following topic in java.

• for loop in java

The program takes a user input for the number of rows and columns for the hollow rectangle. Then using two for loops it will print the star rectangular pattern in java.

Example:

Inputs:
      Rows: 6
      Columns:10
Output:
**********
*        *
*        *
*        *
*        *
**********

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Java Program to Print Rectangle Star Pattern

import java.util.Scanner;

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

    System.out.print("Enter the no. of rows: ");
    rows = sc.nextInt();
    System.out.print("Enter the no. of columns: ");
    columns = sc.nextInt();

    System.out.print("Rectangular star Pattern: \n\n");
    for (i = 1; i <= rows; i++)
    {
      for (j = 1; j <= columns; j++)
      {
        if (i == 1 || i == rows || j == 1 || j == columns)
          System.out.print("*");
        else
          System.out.print(" ");
      }

      System.out.println();
    }
  }
}

Output:

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In this tutorial, we will write a java program to print diamond pattern of stars. Before that, you should have knowledge on the following topic in Java.

• for loop in java

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Java Program to Print Diamond Pattern

Source Code: the program asks the user for the input of a number of rows for the diamond star pattern in java. Then using for loop, the diamond shape pattern is displayed on the screen.

// Print Diamond star Pattern in java

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int n, j, i, space = 1;
    Scanner scan = new Scanner(System.in);

    System.out.print("Enter the no. of Rows: ");
    n = scan.nextInt();

    space = n - 1;

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

      space--;
      for (j = 1; j <= (2 *i - 1); j++)
      {
        System.out.print("*");
      }

      System.out.println();
    }

    space = 1;

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

      space++;
      for (j = 1; j <= (2 *(n - i) - 1); j++)
      {
        System.out.print("*");
      }

      System.out.println();
    }
  }
}

Output:

---

This article will show you how to print a simple pyramid pattern of stars in java.

Patterns are one of the easiest ways to improve the coding skills for java. The frequent use of loops can increase your skills and printing pattern order.

We will see two programs:

1. To print a full pyramid by declaring the number of rows in a program.
2. To print a full pyramid by taking user input for the number of rows.

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1. Java program to print the full pyramid pattern.

 //Pattern full pyramid
 
 public class Main
 { 
  public static void main(String[] args)  
  {  
    int rows = 6;  
    
   for (int i = 0; i < rows + 1; i++) 
   { 
    for (int j = rows; j > i; j--) 
    {  
       System.out.print(" ");  
    }  
     for (int k = 0; k < (2 * i - 1); k++) 
     {  
       System.out.print("*");  
     }  
      System.out.println();  
   }  
  }  
 }

After the execution of the program, you will get the following result:

---

2. Java program to print the full pyramid pattern (user input)

 import java.util.Scanner;
 
 public class Main
 { 
  public static void main(String[] args)  
  {  
     Scanner sc = new Scanner(System.in);
 
    System.out.print("Enter the number of rows: ");
    int rows = sc.nextInt(); 
    
    for (int i = 0; i < rows + 1; i++) 
    { 
     for (int j = rows; j > i; j--) 
     {  
       System.out.print(" ");  
     }  
      for (int k = 0; k < (2 * i - 1); k++) 
      {  
        System.out.print("*");  
      }  
     System.out.println();  
   }  
  }  
 }

After the execution of the program, you will get the following result:

---