Tag: java pattern program

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

• for loop in java

The program below takes a user input for the number of rows needed and then in decreasing order of the first half is printed and then the increasing order of the second half of the sandglass is printed.

This is an hourglass pattern program in java or you can say sandglass pattern program using number.

Hourglass Number Pattern in Java

import java.util.Scanner;

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

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

    //upper half
    for (i = 1; i <= rows; i++)
    {
      for (k = 1; k < i; k++)
        System.out.print(" ");

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

      System.out.println();
    }

    //lower half
    for (i = rows - 1; i >= 1; i--)
    {
      for (k = 1; k < i; k++)
        System.out.print(" ");

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

      System.out.println();
    }
  }
}

Output:

In this tutorial, we will write a program to print a triangle pattern in java where the pattern is repeated by dividing each row in two half just like a mirror. Before that, you may go through the following topic in java.

• for loop in java

Example:

Input: 5
Output:
     0
    101
   21012
  3210123
 432101234

The program takes the user input for the number of rows and displays the result using the for loop in java. The program is a mirror triangle number pattern in java or you can say full pyramid of numbers with mirror image numbers.

Program for triangular pattern

import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    int rows, num1 = 1, num2 = 1;
    Scanner sc = new Scanner(System.in);

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

    for (int i = 0; i < rows; i++)
    {
      for (int j = rows - 1; j > i; j--)
      {
        System.out.print(" ");
      }

      for (int k = 1; k <= num1; k++)
      {
        System.out.print(Math.abs(k - num2));
      }

      num1 += 2;
      num2++;
      System.out.println();
    }
  }
}

Output:

Enter the number of rows: 6
     0
    101
   21012
  3210123
 432101234
54321012345

In this tutorial, we will write a program to print a triangle pattern in java where the pattern is repeated on each row and keep on increasing. Before that, you may go through the following topic in java.

• for loop in java

Example:

Input: 5
1
1 2 1
1 2 3 2 1
1 2 3 4 3 2 1

The program takes the user input for the number of rows and displays the result using the for loop in java. The program is mirror right angled triangle pattern with a repetition pattern or you can say half pyramid of numbers with a repetition pattern.

Java Program to print the right triangle number pattern

import java.util.Scanner;

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

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

    for (int i = 1; i <= rows; i++)
    {
      //first half of the row            
      for (int j = 1; j <= i; j++)
        System.out.print(j + " ");

      //second half of the row              
      for (int j = i - 1; j >= 1; j--)
        System.out.print(j + " ");

      System.out.println();
    }
  }
}

Output:

Enter the number of rows: 5
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
1 2 3 4 5 6 5 4 3 2 1

In this tutorial, we will write a java program to print reverse right angled triangle of numbers with numbers in descending order. Before that, you may go through the following topic in java.

• for loop in java

The program takes the user input for the number of rows and displays the result using the for loop in java. The number is displayed by decreasing order until it becomes a single digit at the last.

The program is an inverted right triangle number pattern in java or you can say half pyramid of numbers in decreasing order.

Java program to print the right triangle pattern of Numbers

import java.util.Scanner;

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

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

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

      System.out.println();
    }
  }
}

Output:

Enter the number of rows: 8
8 7 6 5 4 3 2 1
8 7 6 5 4 3 2
8 7 6 5 4 3
8 7 6 5 4
8 7 6 5
8 7 6
8 7
8

In this tutorial, we will write a program to print triangular number patterns in java where the digits are repeated on each row. Before that, you may go through the following topic in java.

• for loop in java

The program takes the user input for the number of rows and displays the result using the for loop in java. The program is right angled triangle pattern or you can say half pyramid of numbers with repetition of digits.

Java program to print right triangle pattern with repeatation of digits

import java.util.Scanner;

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

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

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

      System.out.println();
    }
  }
}

Output:

Enter the number of rows: 6
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
6 6 6 6 6 6

In this tutorial, we will write a number pattern program in java. The patterns are half pyramid patterns with different combinations of numbers such as in increasing order, decreasing order, or more.

Before that, you may go through the following topic in java.

• for loop in java

Java Program to print Half Pyramid using Numbers

The programs below take the user input for the number of rows to be printed for the half pyramid. Now let us go through the java program to print pyramid pattern of numbers.

import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    int rows;

    Scanner sc = new Scanner(System.in);

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

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

      System.out.println();
    }
  }
}

Output:

Enter the no. of rows: 5
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5