java - 将 DefaultCategoryDataset 值写入文件

Question

我在程序中使用jfree图表。我使用 DefaultCategoryDataset 来保存我想要在图表中显示的数据。现在我想写入 DefaultCategoryDataset 值包括列、行和值的列表。 有人知道我该怎么做吗？？

frame = new JFrame();
frame.setBounds(50, 50, 1135, 1029);

DefaultCategoryDataset dataSet = new DefaultCategoryDataset(); 
for (int i = 0; i < observedEWMAs.size(); i++) {
 dataSet.addValue(observedEWMAs.get(i), "observed" + title,
          ((Integer) (i + 1)).toString()); 
//here i want to write data set fo file

Answer 1

使用DefaultCategoryDataset定义于 BarChartDemo1 ，见过here ，以下代码产生预期的输出:

代码:

for (int r = 0; r < dataset.getRowCount(); r++) {
    String series = (String) dataset.getRowKey(r);
    for (int c = 0; c < dataset.getColumnCount(); c++) {
        System.out.println(series
            + ", " + dataset.getColumnKey(c)
            + ", " + dataset.getValue(r, c));
    }
}

控制台:

First, Category 1, 1.0
First, Category 2, 4.0
First, Category 3, 3.0
First, Category 4, 5.0
First, Category 5, 5.0
Second, Category 1, 5.0
Second, Category 2, 7.0
Second, Category 3, 6.0
Second, Category 4, 8.0
Second, Category 5, 4.0
Third, Category 1, 4.0
Third, Category 2, 3.0
Third, Category 3, 2.0
Third, Category 4, 3.0
Third, Category 5, 6.0