জাবা প্রোগ্রামিং পর্ব-২৪ (How to Make a jar file using jar command ?)

How to Make a jar file using jar command ?

Step1: Compile your java file 
command: javac HelloWorldSwing.java

Step2: Create a manifest file containing your main class name

I have added a 

Example: Main-Class: HelloWorldSwing

Step3: Make jar file by command

command: jar -cvfm MyJarName.jar manifest.txt *.class

By Clicking on MyJarName.jar

N.B. :

Jar command video download link : Click for download

Some Java Programming Exercise Download Link : Click for download

 

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জাভা প্রোগ্রামিং পর্ব-২৩

Problem : (Business: checking ISBN) An ISBN (International Standard Book Number) consists of 10 digits d1d2d3d4d5d6d7d8d9d10 The last digit d10 is a checksum, which is calculated from the other nine digits using the following formula: 

(d1x1+d2x2+d3x3+d4x4+d5x5+d6x6+d7x7+d8x8+d9x9)%11

If the checksum is 10, the last digit is denoted X according to the ISBN convention. Write a program that prompts the user to enter the first 9 digits and displays the 10- digit ISBN (including leading zeros). Your program should read the input as an integer. For example, if you enter 013601267, the program should display 0136012671.

File name : Isbn.java

import java.util.*;

import javax.swing.*;

public class Isbn {

    public static void main (String arg[]){

        Scanner input = new Scanner (System.in);

        int i, sum=0;

        int a[] = new int [10];

        String keep ="";

        for (i=1; i<=9; i++){

            System.out.print ("Enter value for number "+i+"=");

            a[i-1] = input.nextInt();

            keep+=a[i-1];

            sum+=a[i-1]*i;

        }

        int r = sum%11;

        if (r==10)

            System.out.print ("ISBN is : = "+keep+"x");

        else

            System.out.print ("ISBN is : = "+keep+r);

      }

    }

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জাভা প্রোগ্রামিং পর্ব-২২ (Guessing Birthdays)

Problem: Guessing Birthdays

You can find out the date of the month when your friend was born by asking five questions. Each question asks whether the day is in one of the five sets of numbers.

File name : GuessBirthday.java

import java.util.Scanner;

public class GuessBirthday {

  public static void main(String[] args) {

    String set1 =

      " 1  3  5  7\n" +

      " 9 11 13 15\n" +

      "17 19 21 23\n" +

      "25 27 29 31";

    String set2 =

      " 2  3  6  7\n" +

      "10 11 14 15\n" +

      "18 19 22 23\n" +

      "26 27 30 31";

    String set3 =

      " 4  5  6  7\n" +

      "12 13 14 15\n" +

      "20 21 22 23\n" +

      "28 29 30 31";

    String set4 =

      " 8  9 10 11\n" +

      "12 13 14 15\n" +

      "24 25 26 27\n" +

      "28 29 30 31";

    String set5 =

      "16 17 18 19\n" +

      "20 21 22 23\n" +

      "24 25 26 27\n" +

      "28 29 30 31";

    int day = 0;

    // Create a Scanner

    Scanner input = new Scanner(System.in);

    // Prompt the user to answer questions

    System.out.print("Is your birthday in Set1?\n");

    System.out.print(set1);

    System.out.print("\nEnter 0 for No and 1 for Yes: ");

    int answer = input.nextInt();

    if (answer == 1)

      day += 1;

    // Prompt the user to answer questions

    System.out.print("\nIs your birthday in Set2?\n");

    System.out.print(set2);

    System.out.print("\nEnter 0 for No and 1 for Yes: ");

    answer = input.nextInt();

    if (answer == 1)

      day += 2;

    // Prompt the user to answer questions

    System.out.print("Is your birthday in Set3?\n");

    System.out.print(set3);

    System.out.print("\nEnter 0 for No and 1 for Yes: ");

    answer = input.nextInt();

    if (answer == 1)

      day += 4;

    // Prompt the user to answer questions

    System.out.print("\nIs your birthday in Set4?\n");

    System.out.print(set4);

    System.out.print("\nEnter 0 for No and 1 for Yes: ");

    answer = input.nextInt();

    if (answer == 1)

      day += 8;

    // Prompt the user to answer questions

    System.out.print("\nIs your birthday in Set5?\n");

    System.out.print(set5);

    System.out.print("\nEnter 0 for No and 1 for Yes: ");

    answer = input.nextInt();

    if (answer == 1)

      day += 16;

    System.out.println("\nYour birthday is " + day + "!");

  }

}

-------------------------------------------

GuessBirthdayUsingConfirmationDialog.java

File name : GuessBirthdayUsingConfirmationDialog.java

import javax.swing.JOptionPane;

public class GuessBirthdayUsingConfirmationDialog {

  public static void main(String[] args) {

    String set1 =

      " 1  3  5  7\n" +

      " 9 11 13 15\n" +

      "17 19 21 23\n" +

      "25 27 29 31";

    String set2 =

      " 2  3  6  7\n" +

      "10 11 14 15\n" +

      "18 19 22 23\n" +

      "26 27 30 31";

    String set3 =

      " 4  5  6  7\n" +

      "12 13 14 15\n" +

      "20 21 22 23\n" +

      "28 29 30 31";

    String set4 =

      " 8  9 10 11\n" +

      "12 13 14 15\n" +

      "24 25 26 27\n" +

      "28 29 30 31";

    String set5 =

      "16 17 18 19\n" +

      "20 21 22 23\n" +

      "24 25 26 27\n" +

      "28 29 30 31";

    int day = 0;

    // Prompt the user to answer questions

    int answer = JOptionPane.showConfirmDialog(null,

      "Is your birthday in these numbers?\n" + set1);

    if (answer == JOptionPane.YES_OPTION)

      day += 1;

    answer = JOptionPane.showConfirmDialog(null,

      "Is your birthday in these numbers?\n" + set2);

    if (answer == JOptionPane.YES_OPTION)

      day += 2;

    answer = JOptionPane.showConfirmDialog(null,

      "Is your birthday in these numbers?\n" + set3);

    if (answer == JOptionPane.YES_OPTION)

      day += 4;

    answer = JOptionPane.showConfirmDialog(null,

      "Is your birthday in these numbers?\n" + set4);

    if (answer == JOptionPane.YES_OPTION)

      day += 8;

    answer = JOptionPane.showConfirmDialog(null,

      "Is your birthday in these numbers?\n" + set5);

    if (answer == JOptionPane.YES_OPTION)

      day += 16;

    JOptionPane.showMessageDialog(null, "Your birthday is " +

      day + "!");

  }

}

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