JFreechart系列异常 [英] JFreechart SeriesException

问题描述

我试图通过介绍开始和结束日期来绘制一个使用时间序列的条形图，但是我在结束日期显示问题：
线程main中的异常 org.jfree.data.general.SeriesException ：您正在尝试在4-mai-2011期间添加观察结果，但该系列已包含该时间段的观察结果。重复不允许。尝试使用 addOrUpdate（）方法。

I am trying to plot a bar chart using timeseries by introducing the beginning and the end date , but i got a problem with the end date it indicate : Exception in thread "main" org.jfree.data.general.SeriesException: You are attempting to add an observation for the time period 4-mai-2011 but the series already contains an observation for that time period. Duplicates are not permitted. Try using the addOrUpdate() method.

final TimeSeries series2 = new TimeSeries("ip max", Day.class);

String datebegin = "04/29/2011 02:00:01";
String dateend = "05/04/2011 02:00:01";
DateFormat formatter;
Date date;
formatter = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
date = formatter.parse(datebegin);
Calendar cal1 = Calendar.getInstance();
cal1.setTime(date);
Date date2;
date2 = (Date) formatter.parse(dateend);
Calendar cal2 = Calendar.getInstance();
cal2.setTime(date2);
while (((cal1.compareTo(cal2)) != 0))  {
    cal1.add(Calendar.HOUR, 24);
    String intermediatestringdate = formatter.format(cal1.getTime());
    System.out.println( intermediatestringdate);
    Date intermediatedate = (Date) formatter.parse(dateend);
    series2.add(new Day(intermediatedate),500);
}

推荐答案

假设您正在创建一个时间基于条形图的 ChartFactory.createXYBarChart（） 与 IntervalXYDataset ，只需构建您的 TimeSeries 与合适的 TimePeriod 。

Assuming you are creating a time-based bar chart using ChartFactory.createXYBarChart() with an IntervalXYDataset, just construct the domain of your TimeSeries with a suitable TimePeriod.

private static IntervalXYDataset createDataset() {
    TimeSeries series = new TimeSeries("Series");
    RegularTimePeriod day = new Day(29, 4, 2011);
    RegularTimePeriod end = new Day(4, 5, 2011);
    int i = 1;
    while (day.compareTo(end) < 1) {
        series.addOrUpdate(day, i++);
        day = day.next();
    }
    TimeSeriesCollection dataset = new TimeSeriesCollection();
    dataset.addSeries(series);
    return dataset;
}

另外，请注意 Day.class 不再需要 TimeSeries 。

Also, note that Day.class is no longer required by TimeSeries.

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