JAVA

In this, part of programming tutorial i will try to explaining more than 50 java * pattern program, Which are asked in interview and online exams and university exam with different logic for the same type of pattern

Program 1- Arrow pattern Program

import java.util.Scanner;
 
public class MainClass
{
    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in);
         
        //Taking rows value from the user
         
        System.out.println("How many rows you want in this pattern?");
         
        int rows = sc.nextInt();
         
        System.out.println("Here is your pattern....!!!");
         
        //Printing upper half of the pattern
         
        for (int i = 1; i <= rows; i++) 
        {
            for (int j = 1; j <= i; j++) 
            { 
                System.out.print(j+" "); 
            } 
             
            System.out.println(); 
        } 
         
        //Printing lower half of the pattern 
         
        for (int i = rows-1; i >= 1; i--)
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(j+" ");
            }
             
            System.out.println();
        }
         
        //Closing the resources
         
        sc.close();
    }
}

Output

1

1 2

1 2 3

1 2 3 4

1 2 3 4 5

1 2 3 4 5 6

1 2 3 4 5 6 7

1 2 3 4 5 6

1 2 3 4 5

1 2 3 4

1 2 3

1 2

1

Youtube Link-

Program 2- Right Angle Triangle

import java.util.Scanner;
 
public class MainClass
{
    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in);
         
        //Taking rows value from the user
         
        System.out.println("How many rows you want in this pattern?");
         
        int rows = sc.nextInt();
         
        System.out.println("Here is your pattern....!!!");
         
        for (int i = 1; i <= rows; i++) 
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(j+" ");
            }
             
            System.out.println();
        }
         
        //Close the resources
         
        sc.close();
    }
}

Output-

1

1 2

1 2 3

1 2 3 4

1 2 3 4 5

1 2 3 4 5 6

1 2 3 4 5 6 7

Youtube Link-

Program 3- Number pattern program decreasing order

import java.util.Scanner;
 
public class MainClass
{
    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in);
         
        //Taking rows value from the user
         
        System.out.println("How many rows you want in this pattern?");
         
        int rows = sc.nextInt();
         
        System.out.println("Here is your pattern....!!!");
         
        for (int i = 1; i <= rows; i++) 
        { 
            for (int j = rows; j >= i; j--)
            {
                System.out.print(j+" ");
            }
             
            System.out.println();
        }
         
        //Closing the resources
         
        sc.close();
    }
}

Output-

7 6 5 4 3 2 1

6 5 4 3 2 1

5 4 3 2 1

4 3 2 1

3 2 1

2 1

1

Youtube Link-

Program 4- Number pattern Program with sequence according to raw and Column

import java.util.Scanner;
 
public class MainClass
{
    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in);
         
        //Taking rows value from the user
         
        System.out.println("How many rows you want in this pattern?");
         
        int rows = sc.nextInt();
         
        System.out.println("Here is your pattern....!!!");
         
        for (int i = rows; i >= 1; i--) 
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print(j+" ");
            }
             
            System.out.println();
        }
         
        //Closing the resources
         
        sc.close();
    }
}
Output-

1 2 3 4 5 6 7

1 2 3 4 5 6

1 2 3 4 5

1 2 3 4

1 2 3

1 2

1

Youtube Link-

Program 5- Palindrome Number Program Java

A palindromic number is a number  that is the same when written forwards or backwards always be same, i.e., of the form . The first few palindromic numbersare therefore  are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121. 

class Palindrome_Dizsweb{  

 public static void main(String args[])
{  

      int r,sum=0;

      int temp;    

      int n=656;

      temp=n;    

      while(n>0)
      {    

           r=n%10; 

           sum=(sum*10)+r;    

                 n=n/10;    

            }    

            if(temp==sum)    

            System.out.println("Palindrome Number YES");    

            else    

            System.out.println("Palindrome Number NO");    

      }  

}  

Output- Palindrome Number YES

Program 6 - Fibonacci Series Program Java

A palindromic number is a number  that is the same when written forwards or backwards always be same, i.e., of the form . The first few palindromic numbersare. 

import java.util.Scanner;

public class Fibonacci_sawan 

  {

  public static void main(String[] args) 

    {

    int n, a = 0, b = 0, c = 1;

    Scanner s = new Scanner(System.in);

    System.out.print("Enter value of n:");

    n = s.nextInt();

    System.out.print("Fibonacci Series Program Output by DIZSWEB : ");

    for(int i = 1; i <= n; i++)

        {

            a = b;

            b = c;

            c = a + b;

            System.out.print(a+"  ");

        }

    }

}

  

Output- 

Enter value of n:5

Fibonacci Series:0 1 1 2 3

Youtube Link-

Program 6- Number pattern Program with sequence according to raw and Column

import java.util.Scanner;
 
public class Rectangular_Pattern_Program
{
    public static void main(String[] args) 
    {
        Scanner scan = new Scanner(System.in);
         
        //Taking rows value from the user to print the star pattern
         
        System.out.println("How many rows you want in this pattern?");
         
        int rows = scan.nextInt();*
        System.out.println("Here is your pattern....!!!");
         
        for (int i = rows; i >= 1; i--) 
        {   for (int j = 1; j <= rows/2; j++)
              {
                print("  ");
              }
            for (int j = 1; j <= ((i*2)-1); j++)
            {
            //  Printing of star
                System.out.print("* ");
            }
     
            for (int j = 1; j <= i; j++)
              {
                print("  ");
              }
            for (int j = i; j < i-; j--)
            {
            //  Printing of star
                System.out.print("* ");
            }




             //Linr termionation will be done when internal loop will complete once
            System.out.println();
        }
         
        //Closing the resources
         
        sc.close();
    }
}

Output-

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

* 

Program 7-  Leap Year Program

Task to Complete

To check whether  given gear is a year is leap year or not

Following program is divided into two main Logic. If any logic fails then the given year is not a leap year.

All these logic should be implemented in same sequence

Logic 1:

• We divide the year by 400
• If remainder is 0 then it is leap year.
• if not then we should go for second.
• 
  

Logic 2:

• We first divide the year by 4 and check remainder.
• if remainder is 0 then it is a leap year.
• If it is not divisible by 4 then it is not a leap year 
• year should also be not divisible by 100.

Then it is a leap year

import java.util.Scanner;public class Leap Year
{ public static void main(String[] args)
  {
    //scanner class declaration
     Scanner scaner_sawan=new Scanner(System.in);
    //input year from user
     System.out.println("Enter a value of Year");     int year = sc.nextInt();     //condition for checking year 
     if((year % 4 == 0 && year % 100!=0) || year % 400 == 0)
        System.out.println(year + " is a leap year.");
     else        System.out.println(year + " is not a leap year.");
        }
}

 Output:-

When input is :- 2000:-  It is leap year

When input is :- 1900:-  It is Not leap year