question: @ Override public boolean equals ( Object obj ) { if ( obj == this ) { return true ; } if ( ! ( obj instanceof DefaultIntervalCategoryDataset ) ) { return false ; } DefaultIntervalCategoryDataset that = ( DefaultIntervalCategoryDataset ) obj ; if ( ! Arrays . equals ( this . seriesKeys , that . seriesKeys ) ) { return false ; } if ( ! Arrays . equals ( this . categoryKeys , that . categoryKeys ) ) { return false ; } if ( ! equal ( this . startData , that . startData ) ) { return false ; } if ( ! equal ( this . endData , that . endData ) ) { return false ; } return true ; }
target:  Tests this dataset for equality with an arbitrary object.