更改YYYY/MM/DD->MM/DD/YYYY java [英] Changing YYYY/MM/DD -> MM/DD/YYYY java

问题描述

我希望将日期格式更改为MM/DD/YYYY，当前为YYYY/MM/DD.

I wish to change my date formatting to MM/DD/YYYY, currently it is in YYYY/MM/DD.

我尝试进行研究，但具有讽刺意味的是，情况总是相反.现在有人可能会说向后尝试从那里开始尝试，但没有成功.

I tried researching it, but to my irony, it is always the other way around. Now one might say try it backwards try working from there, but it didn't work.

我的课堂上讲所有事情:

My class for calling all the things:

import java.util.*;
import java.text.*;

class Driver {   
   public static void main (String[] args) {    
       Kid kid;
       Node list = new Node(); 

       kid = createKid("Lexie", 2.6, "11/5/2009"); 
       insertEnd(list, kid);
       kid = createKid ("Sally", 2.3, "4/8/2009"); 
       insertEnd(list, kid);
       kid = createKid ("Joe", 2.7, "6/16/2009");
       insertEnd(list, kid);
       kid = createKid ("Bob", 2.2, "1/16/2009");
       insertEnd(list, kid);
       kid = createKid ("Tom", 3.1, "8/16/2009");
       insertEnd(list, kid);
       printList(list);
   } //end main method

   public static Kid createKid(String name, double height, String date) {
       return new Kid(name, height, date);
   }

} //end class     


import java.util.*; 
import java.text.SimpleDateFormat;
import java.io.*;
class Kid {  
    String name; 
    double height; 
    GregorianCalendar bDay; 

    ...
    /**
     * Second constructor for kid
     * Setting instances to equal the constructors of this
     * @param 1: Setting n (aka name,   but it was taken) to equal the instance var of name
     * @param 2: Setting h (aka height, but it was taken) to equal the instance var of height
     * @param 3: Setting date to equal the instance var of bDay with some modifications
     */
    public Kid (String n, double h, String date) {
        StringTokenizer st = new StringTokenizer(date, "/");
        this.name = n;
        this.height = h;
        this.bDay = new GregorianCalendar(Integer.parseInt(st.nextToken()), 
        Integer.parseInt(st.nextToken()), Integer.parseInt(st.nextToken()));
    }

    /**
     * public String toString() { 
     * Converting Java language to English language
     */
    public String toString() {

        return (this.name + ", Height: " + this.height + "ft., Born: "
        +       this.bDay.get(Calendar.DATE) + "/" + this.bDay.get(Calendar.MONTH) 
        + "/" + this.bDay.get(Calendar.YEAR));

    }
} //end class 

顺便说一下，我不熟悉的简单日期格式类和日期格式类，并且尝试实现它们均未成功.

推荐答案

只需使用 SimpleDateFormat 将 String 转换为 Date .无需麻烦的 Calendar API.

Just use SimpleDateFormat to convert String to Date. No need to hassle with painful Calendar API.

String dateString = "2012/06/05";
Date date = new SimpleDateFormat("yyyy/MM/dd").parse(dateString);

在整个代码中使用此 Date 对象.每当您需要向人类展示 Date 对象时，只需使用另一个 SimpleDateFormat :

Use this Date object throughout your code instead. Whenever you need to present the Date object to humans, just use another SimpleDateFormat:

String dateString = new SimpleDateFormat("MM/dd/yyyy").format(date);

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