Question

所以我能够打印本月的公历，但是当我试图翻到下个月或上个月时，它似乎再次重新打印当月。请注意，通过＆＃34;打印＆＃34;日历，我的意思是我实际上将其格式化为看起来像我的完整日历（所有日子都像Google日历等）。此外，该计划还处于初期阶段。最终，我希望它支持在几天内添加事件，打印事件等等。

无论如何，这里有一些我可能相关的代码：

MyCalendar课程：

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;


public class MyCalendar {

    GregorianCalendar calendar;
    String[] months;
    String[] dayOfWeek;
    int todayDay;
    int maxDays;
    static PrintMenu print = new PrintMenu();
    private HashMap<MyCalendar, Event> myCalHash = new HashMap<MyCalendar, Event>();

    MyCalendar(){
        calendar = new GregorianCalendar(); //capture today
        months = new String[]{"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
        dayOfWeek = new String[]{"Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"};
        todayDay = calendar.get(Calendar.DAY_OF_MONTH);
        maxDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
        calendar.set(Calendar.DAY_OF_MONTH, 1);

    }

    public Calendar getCalendar(){
        return calendar;
    }

    public void setCalendar(GregorianCalendar cal){
        calendar = cal;
    }

    public Date getFirstDayOfMonth(){
        return calendar.getTime();
        //return calendar.get((Calendar.DAY_OF_WEEK) - 1);
    }

    public int getDay(){
        return calendar.get(Calendar.DAY_OF_MONTH);
    }

    public int getMaximumDays(){
        return maxDays;
    }

    public int getTodayDay(){
        return todayDay;
    }

    public int getMonth(){
        return calendar.get(Calendar.MONTH);
    }

    public int getYear(){
        return calendar.get(Calendar.YEAR);
    }

    public void setNext(){
        calendar.add(Calendar.MONTH, 1);
    }
    public void setPrevious(){
        calendar.add(Calendar.MONTH, -1);
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        print.printCalendar(false);
        print.printMenu();

        System.out.println("I think we're done here!");
    }

}

PrintMenu课程：

public class PrintMenu {

MenuHandler menu = new MenuHandler();
MyCalendar myCalendar = new MyCalendar();


void printCalendar(boolean withEvents){

     int count = 0; //for formatting 
     int day = myCalendar.getTodayDay();

     System.out.println(myCalendar.months[myCalendar.getMonth()] + " " + myCalendar.getYear());
     System.out.print(myCalendar.dayOfWeek[6] + " ");
     for(int i = 0; i < myCalendar.dayOfWeek.length - 1; i++){
         System.out.print(myCalendar.dayOfWeek[i] + " ");
     }

    // int daysInMonth = myCalendar.getMaximumDays(); // 28
    for(int i = 1; i <= myCalendar.dayOfWeek.length; i++){
        count++;
        if(!myCalendar.dayOfWeek[i].equals(myCalendar.getFirstDayOfMonth().toString().substring(0, 2))){
            System.out.print("  ");
        }else{
            count = 0;
            break;
        }
    }
     System.out.println();
    for(int i = 1; i <= myCalendar.getMaximumDays(); i++){
        if(!withEvents){
            if(i == day){
                System.out.print("[" + i + "]");
            }
            if(i < 10){
                System.out.print(" " + i + " ");

            }else{
                if(i != day){
                    System.out.print(i + " ");
                }
            }
        }
        else{
        if(i < 10){
            System.out.print(" " + i + " ");

        }else{
            System.out.print(i + " ");
        }
        }


        count++;
        if(count >= 7){
            System.out.println();
            count = 0; //reset back
        }
    }
}

void printMenu(){

    System.out.println("-------------------------------------------------------------------");

    System.out.println("Select one of the following options: ");
    System.out.println("[L]oad   [V]iew by  [C]reate, [G]o to [E]vent list [D]elete  [Q]uit");
    menu.handleChoice();
    printMenu();
}

}

ViewCalendar类（这是我尝试浏览日历并失败的地方）

import java.util.Calendar;
import java.util.Scanner;


public class ViewCalendar {
Scanner sc = new Scanner(System.in);
MyCalendar myCalendar = new MyCalendar();

public void whatView(){

    System.out.print("[D]ay view or [M]view? ");
    char userChoice = sc.next().charAt(0);
    if(Character.toUpperCase(userChoice) == 'D'){ dayView(); }
    else if(Character.toUpperCase(userChoice) == 'M'){ monthView(); }
    else{
        System.out.println("Invalid choice.");
        whatView();
    }

}
public void dayView(){
    //print day calendar
    System.out.print("[P]revious or [N]ext or [M]ain menu ? ");
    char userChoice = sc.next().charAt(0);
    if(Character.toUpperCase(userChoice) == 'P'){

    }
    else if(Character.toUpperCase(userChoice) == 'N'){

    }
    else if(Character.toUpperCase(userChoice) == 'M'){
        return;
    }
    else{
        System.out.println("Invalid choice.");
        dayView();
    }
}
public void monthView(){
    //print month calendar
    myCalendar.print.printCalendar(true);
    System.out.print("[P]revious or [N]ext or [M]ain menu ? ");
    char userChoice = sc.next().charAt(0);
    if(Character.toUpperCase(userChoice) == 'P'){
        myCalendar.setPrevious();
        myCalendar.print.printCalendar(true);
    }
    else if(Character.toUpperCase(userChoice) == 'N'){
        myCalendar.setNext();
        myCalendar.print.printCalendar(true);
    }
    else if(Character.toUpperCase(userChoice) == 'M'){
        return;
    }
    else{
        System.out.println("Invalid choice.");
        dayView();
    }
}

}

无论如何，我希望没有太多的信息。我遵循了calendar.add（）语法，但它似乎没有任何效果。我很感激你们有任何见解！

这是MenuHandler类：

import java.util.Scanner;


public class MenuHandler {

Scanner sc = new Scanner(System.in);
ViewCalendar view = new ViewCalendar();


    public void handleChoice(){

        char userChoice = sc.next().charAt(0);
        switch(Character.toUpperCase(userChoice)){
            case 'L':

            case 'V': view.whatView();
                    //  menu.printMenu();

            case 'C':

            case 'G':

            case 'E':

            case 'D':

            case 'Q': return;
        }


        }

}

Answer 1

@hotshotennis您可以尝试使用方法set()代替方法add()来操纵日期。

public class MyCalendar {

  .....
  ..... 

  public void setNext(){
     calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) + 1);
  }
  public void setPrevious(){
     calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) - 1);
  }

  .....    
  ..... 
}

在公历中的月份之间切换

1 个答案: