Java Prime Pro

Java program to print prime numbers in java

import java.util.Scanner;

public class PrimeNumberExample

{

 public static void main(String args[])

{

System.out.println("Enter the number till which prime number to be printed: ");
      int limit = new Scanner(System.in).nextInt();

System.out.println("Printing prime number from 1 to " + limit);
      for(int number = 2; number<=limit; number++)

{

if(isPrime(number)){
              System.out.println(number);
          }
      }

    }

public static boolean isPrime(int number)

{
        for(int i=2; i

         {
           if(number%i == 0)

          {
               return false;
           }
        }
        return true;
    }
}

Java program for prime number

import java.util.*;

          class PrimeNum

{

 public static void main(String args[])

 {

        int n;

        int i;

        System.out.println(" enter the number to evaluate for prime number: ");

                  Scanner sc=new Scanner(System.in);

        n = sc.nextInt();

                   for(i=2; i<=n/2; i++)    

        {

            if(n%i==0)

            {

                System.out.println(n + " is not a Prime Number ");

                return;

            }

        }

        System.out.println(n + " is a Prime Number ");

    }

}

Java program to check if an integer is prime or not

import java.util.Scanner;

public class Testing

{

    public static void main(String args[]) 

    {

        Scanner scnr = new Scanner(System.in);

        int number = Integer.Max_value;

        System.out.println("Enter number to check if prime or not ");

        while (number != 0) 

        {

            number = scnr.nextInt();

            System.out.printf("Does %d is prime? %s %s  %s %n", number,

            isPrime(number), isPrimeOrNot(number), isPrimeNumber(number));

        }

    }

public static boolean isPrime(int number) 

{

        int sqrt = (int) Math.sqrt(number) + 1;

        for (int i = 2; i < sqrt; i++) 

         {

            if (number % i == 0) 

            {

                return false;

            }

        }

        return true;

    }

public static boolean isPrimeNumber(int number) 

{

        if (number == 2 || number == 3) 

       {

            return true;

        }

        if (number % 2 == 0) 

        {

            return false;

        }

        int sqrt = (int) Math.sqrt(number) + 1;

        for (int i = 3; i < sqrt; i += 2) 

        {

            if (number % i == 0) 

            {

                return false;

            }

        }

        return true;

    }

public static String isPrimeOrNot(int num) 

{

        if (num < 0) 

        {

            return "not valid";

        }

        if (num == 0 || num == 1) 

        {

            return "not prime";

        }

        if (num == 2 || num == 3) {

            return "prime number";

        }

        if ((num * num - 1) % 24 == 0) 

        {

            return "prime";

        }  

         else 

           {

            return "not prime";

        }

    }

}

What is method overloading and overriding in java

public class OverloadingOverridingTest

{

         public static void main(String[] args)

           {

           Loan cheapLoan = Loan.createLoan("HSBC");

  Loan veryCheapLoan = Loan.createLoan("Citibank");

            Loan personalLoan = new PersonalLoan();

   personalLoan.toString();

    }

  }

public class Loan

{

    private double interestRate;

    private String customer;

    private String lender;

        public static Loan createLoan(String lender)

          {

        Loan loan = new Loan();

        loan.lender = lender;

        return loan;

 }

         public static Loan createLoan(String lender, double interestRate)

           {

        Loan loan = new Loan();

        loan.lender = lender;

        loan.interestRate = interestRate;

        return loan;

    }

           public String toString()

             {

        return "This is Loan by Citibank";

    }

}

        public class PersonalLoan extends Loan

          {

         public String toString()

          {

        return "This is Personal Loan by Citibank";

    }

}

Find hidden files in java

import java.io.File;

public class FileHiddenExample

{

 public static void main(String[] args)throws SecurityException ,IOException

 {

            File file = new File("C:/HiddenTest.txt");

        if (file.isHidden())

        {

            System.out.println("This file is Hidden file: ");

        }

        else

        {

                System.out.println("File is not Hidden ");

        }    

  }

}