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Monday, 13 March 2017

Chapter 33 Exercise 13, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

33.13 (Day of week) Write a program that displays the day of the week for a given day, month, and year, as shown in Figure 33.36. The program lets the user select a day, month, and year, and click the Get Day of Week button to display the day of week. The Time field displays Future if it is a future day or Past otherwise. Use the Zeller’s congruence to find the day of the week (See Programming Exercise 3.21).


import java.text.SimpleDateFormat;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import java.util.Date;

@ManagedBean
@SessionScoped
public class Exercise13 {
   public int day = 1;
   public int month= 1;
   public int year=2017;
   public String dayOfWeek="";
   public String time="";
   public int getDay() {
      return day;
   }

   public void setDay(int data) {
      this.day = data;
   }
   public int getMonth() {
      return month;
   }

   public void setMonth(int data) {
      this.month = data;
   }
   
   public int getYear() {
      return year;
   }

   public void setYear(int data) {
      this.year = data;
   }
   public String getSolution()
   {
       return "YES";
   }
   public String getdayOfWeek() {
        if ((month == 1)||(month == 2)) 
        {
            month += 12;
            year--;
 }
 int yearOfCentury = year % 100;
 int century = year / 100;  
        int cday = (day + (26 * (month + 1)) / 10 + yearOfCentury + yearOfCentury / 4 + century / 4 + 5 * century) % 7;
        switch(cday) 
        {
            case 0: dayOfWeek="Saturday"; break;
            case 1: dayOfWeek="Sunday"; break;
            case 2: dayOfWeek="Monday"; break;
            case 3: dayOfWeek="Tuesday"; break;
            case 4: dayOfWeek="Wednesday"; break;
            case 5: dayOfWeek="Thursday"; break;
            case 6: dayOfWeek="Friday"; break;
        }
      return dayOfWeek;
   }
   public String gettime()
   {
       Date now = new Date();
       SimpleDateFormat dateFormat=new SimpleDateFormat("yyyyMMdd");
       try {
           Date date = dateFormat.parse(String.valueOf(year)+String.valueOf(month)+String.valueOf(day));
            if( now.compareTo( date) < 0 ) {
                time="Future";
            }
            else
            {
                time="Past";
            }
       }catch(Exception e)
       {
           
       }
       
       return time;
   }
   public void setdayOfWeek()
   {
       
   }

}

<?xml version = "1.0" encoding = "UTF-8"?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"  
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns = "http://www.w3.org/1999/xhtml" 
   xmlns:f = "http://java.sun.com/jsf/core"     
   xmlns:h = "http://java.sun.com/jsf/html"> 
   
   <head> 
      <title>Excercise 13</title> 
   </head> 
   
   <h:body> 
      <h2>Day Of Week Calculator</h2> 
      <hr /> 
      
      <h:form> 
         Day
         <h:selectOneMenu value = "#{exercise13.day}"> 
            <f:selectItem itemValue = '1' itemLabel = '1' /> 
            <f:selectItem itemValue = '2' itemLabel = '2' /> 
            <f:selectItem itemValue = '3' itemLabel = '3' /> 
            <f:selectItem itemValue = '4' itemLabel = '4' /> 
            <f:selectItem itemValue = '5' itemLabel = '5' /> 
            <f:selectItem itemValue = '6' itemLabel = '6' /> 
            <f:selectItem itemValue = '7' itemLabel = '7' /> 
            <f:selectItem itemValue = '8' itemLabel = '8' /> 
            <f:selectItem itemValue = '9' itemLabel = '9' /> 
            <f:selectItem itemValue = '10' itemLabel = '10' /> 
            <f:selectItem itemValue = '11' itemLabel = '11' /> 
            <f:selectItem itemValue = '12' itemLabel = '12' /> 
            <f:selectItem itemValue = '13' itemLabel = '13' /> 
            <f:selectItem itemValue = '14' itemLabel = '14' /> 
            <f:selectItem itemValue = '15' itemLabel = '15' /> 
            <f:selectItem itemValue = '16' itemLabel = '16' /> 
            <f:selectItem itemValue = '17' itemLabel = '17' /> 
            <f:selectItem itemValue = '18' itemLabel = '18' /> 
            <f:selectItem itemValue = '19' itemLabel = '19' /> 
            <f:selectItem itemValue = '20' itemLabel = '20' /> 
            <f:selectItem itemValue = '21' itemLabel = '21' /> 
            <f:selectItem itemValue = '22' itemLabel = '22' /> 
            <f:selectItem itemValue = '23' itemLabel = '23' /> 
            <f:selectItem itemValue = '24' itemLabel = '24' /> 
            <f:selectItem itemValue = '25' itemLabel = '25' /> 
            <f:selectItem itemValue = '26' itemLabel = '26' /> 
            <f:selectItem itemValue = '27' itemLabel = '27' /> 
            <f:selectItem itemValue = '28' itemLabel = '28' /> 
            <f:selectItem itemValue = '29' itemLabel = '29' /> 
            <f:selectItem itemValue = '30' itemLabel = '30' /> 
            <f:selectItem itemValue = '31' itemLabel = '31' /> 
         </h:selectOneMenu>
         Month
          <h:selectOneMenu value = "#{exercise13.month}"> 
              <f:selectItem itemValue = '1' itemLabel = 'January' /> 
              <f:selectItem itemValue = '2' itemLabel = 'February' /> 
              <f:selectItem itemValue = '3' itemLabel = 'March' /> 
              <f:selectItem itemValue = '4' itemLabel = 'April' /> 
              <f:selectItem itemValue = '5' itemLabel = 'May' /> 
              <f:selectItem itemValue = '6' itemLabel = 'June' /> 
              <f:selectItem itemValue = '7' itemLabel = 'July' /> 
              <f:selectItem itemValue = '8' itemLabel = 'August' /> 
              <f:selectItem itemValue = '9' itemLabel = 'September' /> 
              <f:selectItem itemValue = '10' itemLabel = 'October' /> 
              <f:selectItem itemValue = '11' itemLabel = 'November' /> 
              <f:selectItem itemValue = '12' itemLabel = 'December' />              
          </h:selectOneMenu>
         Year
         <h:inputText value="#{exercise13.year}" size="5"/>
         <h:commandButton value="Get Day of Week"/>
         <br />
         <p>
             Day of the Week <h:outputLabel value="#{exercise13.dayOfWeek}"/>
             Time <h:outputLabel value="#{exercise13.time}"/>
         </p>
         <br />
         
      </h:form>    
   
   </h:body> 
</html> 

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