Write a java application that reads a number from the keyboard and check that it is Prime or not(File must be save as: Prime01.java)

import javax.swing.JOptionPane;

class Prime01

{

            public static void main(String args[])

            {

                        String s;

                        double n;

                        int i,p=0,a,c;

                        s=JOptionPane.showInputDialog("Enter any number: ");

                        a=Integer.parseInt(s);

                        n=Math.sqrt(a);

                        c=(int)n;

                        if(a<2)

                        JOptionPane.showMessageDialog(null,"The number is not prime.");

                        else

                        {

                                    for(i=2;i<=c;i++)

                                    {

                                                if(a%i==0)

                                                p++;

                                    }

                                    if(p>0)

                                    JOptionPane.showMessageDialog(null,"The number is not prime.");

                                    else

                                    JOptionPane.showMessageDialog(null,"The number is prime.");

                        }

                        System.exit(0);

            }

}

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Copy & paste this code in your TextPad & run, then you will get output.......
If you have any problem please comment below.........