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[英]java.util.GregorianCalendar issue with add() when applying DST changes
[英]GregorianCalendar outputs: The date is java.util.GregorianCalendar[time=1141556400000,areFieldsSet=true,areAllFieldsSet=true
我的文本文件中包含以下數據,稍后我將在其中掃描程序。
17-Mar-2006 1100 1280
16-Jan-2002 1120 1230
15-Jun-2003 1140 1900
我將這些數據構建為“股市”對象。 實例變量“日期”被聲明為GregorianCalendar。 構造函數String dt在String中應采用“ dd-MMM-yyyy”形式。 公共String date()也是如此,它應返回形式為“ dd-MMM-yyyy”的字符串。 我以以下方式完成操作,但輸出:日期為java.util.GregorianCalendar [time = 1141556400000,areFieldsSet = true,areAllFieldsSet = true,lenient = true,zone = sun.util.calendar.ZoneInfo [id =“。 ....
對修復有任何想法嗎?
public class Stockmarket{
// instance variables
private GregorianCalendar date;
private double opening;
private double closing;
public Stockmarket(String dt, double opening, double closing)
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy", Locale.US);
Date d = sdf.parse(dt);
GregorianCalendar cal = (GregorianCalendar) Calendar.getInstance();
cal.setTime(d);
this.date=cal;
this.opening=opening;
this.closing=closing;
}
public String date(){
SimpleDateFormat df = new SimpleDateFormat("dd-MMM-yyyy, Locale.US");
df.setCalendar(this.date);
String date = df.format(this.date.getTime());
return date;
}
如果格式已知且統一,則可以使用SimpleDateFormat實現所需的功能。
public class TestParse {
public static void main(String[] args) {
String myDate = "17-Mar-2006";
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MMM-yyyy");
Date date = null;
try {
date = simpleDateFormat.parse(myDate);
} catch (ParseException e) {
e.printStackTrace();
}
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(date);
System.out.println(calendar.getTime());
}
}
編輯:添加了基於問題更改的更多信息
方法getStringFromDate
產生格式化的日期為2006年3月17日
public class TestParse {
public static void main(String[] args) {
String myDate = "17-Mar-2006";
Date date = getDateFromString(myDate);
// Set the Calendar
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(date);
// format date
String formattedDate = getStringFromDate(calendar);
System.out.printf("The formatted date is : %s & the dates are equal %s%n", formattedDate, formattedDate.equals(myDate));
}
public static String getStringFromDate(GregorianCalendar calendar) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MMM-yyyy", Locale.US);
simpleDateFormat.setCalendar(calendar);
return simpleDateFormat.format(calendar.getTime());
}
public static Date getDateFromString(String input) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MMM-yyyy", Locale.US);
Date date = null;
try {
date = simpleDateFormat.parse(input);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
}
您的股票市場類別固定類型的格式
public class Stockmarket {
// instance variables
private GregorianCalendar date;
private double opening;
private double closing;
public Stockmarket(String dt, double opening, double closing) {
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy", Locale.US);
Date d = null;
try {
d = sdf.parse(dt);
} catch (ParseException e) {
e.printStackTrace();
}
GregorianCalendar cal = (GregorianCalendar) Calendar.getInstance();
cal.setTime(d);
this.date = cal;
this.opening = opening;
this.closing = closing;
}
public String date() {
SimpleDateFormat df = new SimpleDateFormat("dd-MMM-yyyy", Locale.US);
df.setCalendar(this.date);
String date = df.format(this.date.getTime());
return date;
}
}
測試班
public class TestParse {
public void doTest()
{
Stockmarket stockmarket1 = new Stockmarket("17-Mar-2006",500,600);
stockmarket1.date();
System.out.println(stockmarket1.date());
Stockmarket stockmarket2 = new Stockmarket("16-Jan-2002",500,600);
stockmarket2.date();
System.out.println(stockmarket2.date());
Stockmarket stockmarket3 = new Stockmarket("15-Jun-2003",500,600);
stockmarket3.date();
System.out.println(stockmarket3.date());
}
public static void main(String[] args) {
TestParse testParse = new TestParse();
testParse.doTest();
}
}
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