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DefaultCategoryDataset class

  • DefaultCategoryDataset class comes under the org.jfree.data.category package of JFreeChart library.
  • A default implementation of the CategoryDataset interface.
  • Methods present in this class add and set values to the table.

Constructor:

constructor Description
DefaultCategoryDataset( ) It creates new empty dataset.

Method Summary

Method Description
addValue(double value, Comparable rowKey, Comparable columnKey) This method adds a value to the table.
addValue(Number value, Comparable rowKey, Comparable columnKey) This method adds a value to the table.
clear( ) This method clears all data from the dataset and sends a DatasetChangeEvent to all registered listeners.
equals(Object obj) This method tests this dataset for equality with an arbitrary object.
getColumnCount( ) This method returns the number of columns in the table.
getColumnIndex(Comparable key) This method returns the column index for a given key.
getColumnKey(int column) This method returns a column key.
getRowCount( ) This method returns the number of rows in the table.
getRowIndex(Comparable key) This method returns the row index for a given key.
getRowKeys( ) This method returns the row keys.
getValue(Comparable rowKey, Comparable columnKey) This method returns the value for a pair of keys.
getValue(int row, int column) This method returns a value from the table.
removeColumn(Comparable columnKey) This method removes a column from the dataset and sends a DatasetChangeEvent to all registered listeners.
removeRow(Comparable rowKey) This method removes a row from the dataset and sends a DatasetChangeEvent to all registered listeners.
setValue(double value, Comparable rowKey, Comparable columnKey) This method adds or updates a value in the table and sends a DatasetChangeEvent to all registered listeners.





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