question: @ Override public boolean equals ( Object obj ) { if ( obj == this ) { return true ; } if ( ! ( obj instanceof BubbleXYItemLabelGenerator ) ) { return false ; } if ( ! super . equals ( obj ) ) { return false ; } BubbleXYItemLabelGenerator that = ( BubbleXYItemLabelGenerator ) obj ; if ( ! ObjectUtilities . equal ( this . zFormat , that . zFormat ) ) { return false ; } if ( ! ObjectUtilities . equal ( this . zDateFormat , that . zDateFormat ) ) { return false ; } return true ; }
target:  Tests this object for equality with an arbitrary object.