question: public Sector union ( float [ ] array , int count , int stride ) { if ( array == null || array . length < stride ) { throw new IllegalArgumentException ( Logger . logMessage ( Logger . ERROR , "Sector" , "union" , "missingArray" ) ) ; } if ( count < 0 ) { throw new IllegalArgumentException ( Logger . logMessage ( Logger . ERROR , "Sector" , "union" , "invalidCount" ) ) ; } if ( stride < 2 ) { throw new IllegalArgumentException ( Logger . logMessage ( Logger . ERROR , "Sector" , "union" , "invalidStride" ) ) ; } double minLat = Double . isNaN ( this . minLatitude ) ? Double . MAX_VALUE : this . minLatitude ; double maxLat = Double . isNaN ( this . maxLatitude ) ? - Double . MAX_VALUE : this . maxLatitude ; double minLon = Double . isNaN ( this . minLongitude ) ? Double . MAX_VALUE : this . minLongitude ; double maxLon = Double . isNaN ( this . maxLongitude ) ? - Double . MAX_VALUE : this . maxLongitude ; for ( int idx = 0 ; idx < count ; idx += stride ) { float lon = array [ idx ] ; float lat = array [ idx + 1 ] ; if ( maxLat < lat ) { maxLat = lat ; } if ( minLat > lat ) { minLat = lat ; } if ( maxLon < lon ) { maxLon = lon ; } if ( minLon > lon ) { minLon = lon ; } } if ( minLat < Double . MAX_VALUE ) { this . minLatitude = minLat ; } if ( maxLat > - Double . MAX_VALUE ) { this . maxLatitude = maxLat ; } if ( minLon < Double . MAX_VALUE ) { this . minLongitude = minLon ; } if ( maxLon > - Double . MAX_VALUE ) { this . maxLongitude = maxLon ; } return this ; }
target:  Sets this sector to the union of itself and an array of specified locations. If this sector is empty, it bounds the specified locations. The array is understood to contain location of at least two coordinates organized as (longitude, latitude, ...), where stride indicates the number of coordinates between longitude values.