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Thread: Advancing day w/ if/else & switch statement

  1. #1
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    Red face Advancing day w/ if/else & switch statement

    I have a project due Monday for my Intro Java class and I really need to do well on it! I need to write a MyDate class that has 3 integers representing month, day & year. in it, I need a MyDate method, and adavceByOneDay method. In my tester class, I need to run scanner input and propts/reads month, day, year inputs. It also needs to print the date before and after it has been advanced by a day. I need to take into account month/year rollover, and leap years. I think using the gregorian calendar may be easier to set up the date, but the section we've been working on is "if/else" and "switch" statements. I think my part of my problem is that I don't fully understand how to relate the tester class with the main class. Anyhelp is greatly appreciated!

    public class MyDate {
    	public int month, day, year;
    	public MyDate(int month , int day, int year) {
    		MyDate date = new MyDate(month, day, year);
    	}
     
    	public boolean advanceByOneDay(){
    		boolean isAdvanced = true;
    		if(day+1> daysInMonth())
    		{
    			if(month+1 > 12)
    			{	
    			month = 1;
    			day = 1;
    			year++;
    			}
    			else
    			{
    			month++;
    			day = 1;		
    			}
    		}
    		else
    		{
    			day++;
    		}
    		return isAdvanced;
    }	
     
     
    	public static String getMonthInString(int n) {
    		String result = "";
    		switch(n) {
    		case 1: result = "January"; break;
    		case 2: result = "Febuary"; break;
    		case 3: result = "March"; break;
    		case 4: result = "April"; break;
    		case 5: result = "May"; break;
    		case 6: result = "June"; break;
    		case 7: result = "July"; break;
    		case 8: result = "August"; break;
    		case 9: result = "September"; break;
    		case 10: result = "October"; break;
    		case 11: result = "November"; break;
    		case 12: result = "December"; break;
    		default: result = "Error"; //break;
    		}
    		return result;		
    	}
     
    	private boolean isLeapYear(){
    		boolean leap = false;
    		if (year % 4 == 0) 
    		{
    			if (year % 100 == 0)
    			{
    				if (year % 400 == 0)
    				{
    					leap = true;
    				}
    				else 
    					leap = false;
    			}
    		}
    		return leap;
    	}
     
     
     
     
    	private int daysInMonth() {
    		switch (month){
    		case 1:day = 31;break;
    		case 2:if (isLeapYear())
    				day = 29;
    				else
    					day = 28;break;
    		case 3:day = 31;break;
    		case 4:day = 30;break;
    		case 5:day = 31;break;
    		case 6:day = 30;break;
    		case 7:day = 31;break;
    		case 8:day = 31;break;
    		case 9:day = 30;break;
    		case 10:day = 31;break;
    		case 11:day = 30;break;
    		case 12:day = 31;break;
    		default:
    		if ((month < 1)||(month > 12));
     
     
    		}
    		return day;
    	}

    import java.util.Scanner;
     
    public class MyDateTester {
    	public int month, day, year;
     
     
     
     
    	public static void main(String[] args) {
    		int month;
    		int day;
    		int year;
     
    		Scanner input = new Scanner(System.in);
    		System.out.println("This program was written by Robert Read");
    		System.out.println("This program will allow you to input month, day, and year in digits, advance it by one day and print both dates in proper format.");
    		System.out.println("Enter the month by it numerical value (1 for January, 2 for Febuary, etc): ");
    		month = input.nextInt();
    		System.out.println("Enter the Day (between 1-31 depending on the month): ");
    		day = input.nextInt();
    		System.out.println("Enter the four digit year; ");
    		year = input.nextInt();	
     
    		return(isAdvanced);
    }
    }


  2. #2
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    Default Re: Advancing day w/ if/else & switch statement

    Hi rbread80,
    in tester class, you set from standard input 3 integer: day, month and year.
    But you don't use your class MyDate.

    Maybe the solution is:
    put in your tester class this code:

    MyDate myDate = new MyDate(month,day,year);
    return (myDate.advanceByOneDay);

    2 things I don't understand:

    1) the constructor of MyClass
    2) function advanceByOneDay returns ever TRUE
    so what do u want test if the result is ever TRUE?

    Tell me!

  3. #3
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    Default Re: Advancing day w/ if/else & switch statement

    I've changed it some, but here is my new advanceByOneDay method

    public String advanceByOneDay(){
    		/**
    		* advances date by one day
    		**/
     
    		String result= " ";
     
    		if(day+1> daysInMonth())
    		{
    		if(month+1 > 12)
    		{ 
    		month = 1;
    		day = 1;
    		year++;
    		}
    		else
    		{
    		month++;
    		day = 1; 
    		}
    		}
    		else
    		{
    		day++;
    		}
    		return result;
    		}

    honestly, i'm not too sure about my constructor too. if you have any suggestions, let me know!
    Right now, it looks like my advanceByOneDay and isLeapYear methods aren't working right. I think it may be that advanceByOneDay doesn't read the scanner input right, and isLeapYear works, except that it won't respond with the correct days in a leap year.
    thanks for the reply!
    brandon

  4. #4
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    Default Re: Advancing day w/ if/else & switch statement

    After my tweaking, this is my entire updated code:

    public class MyDate {
     
    	public int month, day, year;
     
     
    	public MyDate(int month , int day, int year) {
     
    		this.month = month;
    		this.day = day;
    		this.year = year;
    	}
     
    	int daysInMonth() {
    		/**
    		 * Gives the number of days in a year
    		 **/
     
    		switch (month){
    		case 1:day = 31;break;
    		case 2:if (isLeapYear())
    				day = 29;
    				else
    					day = 28;break;
    		case 3:day = 31;break;
    		case 4:day = 30;break;
    		case 5:day = 31;break;
    		case 6:day = 30;break;
    		case 7:day = 31;break;
    		case 8:day = 31;break;
    		case 9:day = 30;break;
    		case 10:day = 31;break;
    		case 11:day = 30;break;
    		case 12:day = 31;break;
    		default:
    		if ((month < 1)||(month > 12));
     
    		}
    		return day;
    	}
     
    	public String advanceByOneDay(){
    		/**
    		* advances date by one day
    		**/
     
    		String result= " ";
     
    		if(day+1> daysInMonth())
    		{
    		if(month+1 > 12)
    		{ 
    		month = 1;
    		day = 1;
    		year++;
    		}
    		else
    		{
    		month++;
    		day = 1; 
    		}
    		}
    		else
    		{
    		day++;
    		}
    		return result;
    		} 
     
    	private boolean isLeapYear(){
    		/**
    		 * 	Decides if year is leap year.
    		 **/
    		boolean leap = false;
    		if (year % 4 == 0) 
    		{
    			if (year % 100 == 0)
    			{
    				if (year % 400 == 0)
    				{
    					leap = true;
    				}
    				else 
    					leap = false;
    			}
    		}
    		return leap;
    	}
     
     
    	public static String getMonthInString(int month, int day, int year) {
    		/**
    		 * changes input numerical month to written month
    		 **/
     
    		String result = " ";		
    		switch(month) {
    		case 1: result = "January"; break;
    		case 2: result = "February"; break;
    		case 3: result = "March"; break;
    		case 4: result = "April"; break;
    		case 5: result = "May"; break;
    		case 6: result = "June"; break;
    		case 7: result = "July"; break;
    		case 8: result = "August"; break;
    		case 9: result = "September"; break;
    		case 10: result = "October"; break;
    		case 11: result = "November"; break;
    		case 12: result = "December"; break;
    		default: result = "Error"; //break;
    		}
    		return result;		
     
    }	
     
     
     
     
     
    	/*
    	public String toString1(){		
    		return getMonthInString(day, day, day);
    	}
    	*/
     
    	public int getMonth() {return month;}
    	public int getDay() {return day;}
    	public int getYear() {return year;}
    	public void setMonth(int month){this.month = month;}
    	public void SetDay(int day){this.day = day;}
    	public void setSalary(int year) {this.year = year;}
     
    }



    import java.util.Scanner;
     
     
    public class MyDateTester {
    		public static int month, day, year;
     
     
    	public static void main(String[] args) {
    		MyDate e = new MyDate(month, day, year);
     
     
     
    		Scanner input = new Scanner(System.in);
     
    		System.out.println("This program was written by Robert Read");
    		System.out.println("This program will allow you to input month, day, and year in digits, advance it by one day and print both dates in proper format.");
    		System.out.println("Enter the month by it numerical value (1 for January, 2 for February, etc): ");
    		int month= input.nextInt();
    		System.out.println("Enter the Day (between 1-31 depending on the month): ");
    		int day= input.nextInt();		
    		System.out.println("Enter the four digit year; ");
    		int year= input.nextInt();			
     
     
     
    		System.out.print(e.getMonthInString(month, day, year) + " " + e.day + ", " + e.year);
     
    		System.out.print(e.daysInMonth());
     
    		//System.out.println(e.advanceByOneDay(month, day, year) + " " + MyDate.getMonthInString(month, day, year) + " " + e.getDay() + ", " + e.getYear());
     
     
    		//advanceByOneDay does not respond by itself
    		//isLeapYear not working?
    	}
     
    }

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