question: @ Override public boolean equals ( Object obj ) { if ( this == obj ) { return true ; } if ( obj == null ) { return false ; } if ( getClass ( ) != obj . getClass ( ) ) { return false ; } Diff other = ( Diff ) obj ; if ( operation != other . operation ) { return false ; } if ( text == null ) { if ( other . text != null ) { return false ; } } else if ( ! text . equals ( other . text ) ) { return false ; } return true ; }
target:  Is this Diff equivalent to another Diff?