java - 如何调用和打印方法

Question

我有我的主类Date.Java

Date.Java 的作用是:
-设置月份日期和年份，并确保其有效输入
-确定您输入的月份有多少天
-确定自您输入之日起已经过去了多少天
-确定距离您输入的日期还剩多少天
- 确定该年份是否为闰年

我还有一个测试类TestDate.java
-它要求用户输入并将其发送到 Date.java

我的问题是我只能让程序打印用户输入的日期。我将如何调用其他方法并让它们打印它们返回的内容？

日期.java:

public class Date
 {
int Day;
int Month;
int Year;
int numberOfDays;
int daysPassed;
int daysRemaining;
int M;
int D;
int Y;



public Date (int Day, int Month, int Year)          
{  
  setDate(Month, Day, Year);

}

public void setDate (int Day, int Month, int Year)
{
    setMonth(Month);
    setDay(Day);
    setYear(Year);
}


//-------------------SETTERS----------------------
public void setMonth(int Month)
{
    M = ((Month>0&&Month<13) ?Month:1);      //conditional statement that checks to see if the Month is valid
}

public void setDay(int Day)
{
    D = ((Day>=1&&Day<=365) ?Day:1);      //conditional statement that checks to see if the day is valid

}

public void setYear(int Year)
{
    Y = ((Year>=1000&&Year<=9999) ?Year:1900);      //conditional statement that checks to see if the Year is valid
}

  //-------------------GETTERS----------------------
public int getMonth()
{
    return M;

}

public int getDay()
{
    return D;

}


public int getYear()
{
    return Y;
}

public String toString()
{
    return String.format("%d-%d-%d", getMonth(), getDay(), getYear());
}

public static boolean isLeapYear(int getYear)
{

    if (getYear%4 == 0)
        return true;


    else
        return false;



}

public int daysOfMonth(int getMonth, int numberOfDays, boolean isLeapYear)
{
    if (getMonth==1)        //jan
       numberOfDays = 31;

    //---------------------------------------Feb
    if (isLeapYear == true) //feb
    {
    if (getMonth==2)
       numberOfDays = 29;
    }
    if (isLeapYear == false) //feb
    {
    if (getMonth==2)
       numberOfDays = 28;
    }
    //---------------------------------------Feb

    if (getMonth==3)        //march
       numberOfDays = 31;
    if (getMonth==4)        //april 
       numberOfDays = 30;
    if (getMonth==5)        //may
       numberOfDays = 31;
    if (getMonth==6)        //june
       numberOfDays = 30;
    if (getMonth==7)        //july
       numberOfDays = 31;
    if (getMonth==8)        //august
       numberOfDays = 31;
    if (getMonth==9)        //sept
       numberOfDays = 30;
    if (getMonth==10)       //oct
       numberOfDays = 31;
    if (getMonth==11)       //nov
       numberOfDays = 30;
    if (getMonth==12)       //dec
       numberOfDays = 31;   


    return numberOfDays;
}

public int daysPassedInYear(int getMonth, int Day, int getDay, int numberOfDays, boolean isLeapYear)
{
    if (getMonth==1)
    Day = getDay-31;


    if (isLeapYear = true)
    {
    if (getMonth==2)
    daysPassed = (numberOfDays-getDay)-60;
    if (getMonth==3)
    daysPassed = (numberOfDays-getDay)-91;
    if (getMonth==4)
    daysPassed = (numberOfDays-getDay)-121;
    if (getMonth==5)
    daysPassed = (numberOfDays-getDay)-152;
    if (getMonth==6)
    daysPassed = (numberOfDays-getDay)-182;
    if (getMonth==7)
    daysPassed = (numberOfDays-getDay)-213;
    if (getMonth==8)
    daysPassed = (numberOfDays-getDay)-244;
    if (getMonth==9)
    daysPassed = (numberOfDays-getDay)-274;
    if (getMonth==10)
    daysPassed = (numberOfDays-getDay)-305;
    if (getMonth==11)
    daysPassed = (numberOfDays-getDay)-335;
    if (getMonth==12)
    daysPassed = (numberOfDays-getDay)-366;
    }




    if (isLeapYear = false)
    {
    if (getMonth==2)
    daysPassed = (numberOfDays-getDay)-59;
    if (getMonth==3)
    daysPassed = (numberOfDays-getDay)-90;
    if (getMonth==4)
    daysPassed = (numberOfDays-getDay)-120;
    if (getMonth==5)
    daysPassed = (numberOfDays-getDay)-151;
    if (getMonth==6)
    daysPassed = (numberOfDays-getDay)-181;
    if (getMonth==7)
    daysPassed = (numberOfDays-getDay)-212;
    if (getMonth==8)
    daysPassed = (numberOfDays-getDay)-243;
    if (getMonth==9)
    daysPassed = (numberOfDays-getDay)-273;
    if (getMonth==10)
    daysPassed = (numberOfDays-getDay)-304;
    if (getMonth==11)
    daysPassed = (numberOfDays-getDay)-334;
    if (getMonth==12)
    daysPassed = (numberOfDays-getDay)-365;
    }


    return daysPassed;

}



    public int daysRemainingInYear(int dayspassed, boolean isLeapYear, int daysRemaining)
    {
        if (isLeapYear = true)      
            daysRemaining = (366 - dayspassed);


        if (isLeapYear = false)         
            daysRemaining = (365 - dayspassed);

        return daysRemaining;
    }






}

TestDate.java:

import javax.swing.JOptionPane;



public class TestDate {
public static void main(String[] args) {


int month =Integer.parseInt(JOptionPane.showInputDialog("What month do you want(in number form ex. Jan = 1?"));
int day =Integer.parseInt(JOptionPane.showInputDialog("What day do you want within the month?"));
int year =Integer.parseInt(JOptionPane.showInputDialog("What year do you want"));


Date setDateObject = new Date(month, day, year);
System.out.println(setDateObject.toString());

}

}

Answer 1

您可以调用 Date 对象上的其他方法并打印它们的返回值。

Date date = new Date(1, 2, 2003);

System.out.println(date.getYear());
System.out.println(date.isLeapYear());

你使用参数的方式很奇怪。 getMonth、numberOfDays、isLeapYear 等参数用于将信息传递到函数中。 getMonth 和 isLeapYear 对于函数正常工作至关重要，但 numberOfDays 不是必需的。您可以像这样声明该函数:

public int daysOfMonth(int getMonth, boolean isLeapYear)
{
    if (getMonth==1)        //jan
       return 31;

    //---------------------------------------Feb
    if (isLeapYear && getMonth==2)
       return 29;
    }

    if (/* !isLeapYear && */ getMonth==2)
       return 29;
    }
    //---------------------------------------Feb

    if (getMonth==3)        //march
       return 31;
    if (getMonth==4)        //april 
       return 30;
    if (getMonth==5)        //may
       return 31;
    if (getMonth==6)        //june
       return 30;
    if (getMonth==7)        //july
       return 31;
    if (getMonth==8)        //august
       return 31;
    if (getMonth==9)        //sept
       return 30;
    if (getMonth==10)       //oct
       return 31;
    if (getMonth==11)       //nov
       return 30;
    if (getMonth==12)       //dec
       return 31;   


    return -1; // error
}

然后您可以像这样创建一个日期并调用 daysOfMonth 函数。

Date date = (2, 29, 2004);
System.out.println(date);
System.out.println("Is this date a leap year? " + date.isLeapYear());
System.out.println("How many days in this month? " + date.daysOfMonth(date.getMonth(), date.isLeapYear());