question: public final double doOperation ( ) { List < Integer > allIndices = new ArrayList < Integer > ( masterList ) ; int left , right ; for ( int i = 0 ; i < size ; i ++ ) { left = allIndices . remove ( MathUtils . nextInt ( allIndices . size ( ) ) ) ; right = allIndices . remove ( MathUtils . nextInt ( allIndices . size ( ) ) ) ; double value1 = parameter . getParameterValue ( left ) ; double value2 = parameter . getParameterValue ( right ) ; parameter . setParameterValue ( left , value2 ) ; parameter . setParameterValue ( right , value1 ) ; } return 0.0 ; }
target:  swap the values in two random parameter slots.