question: public int [ ] mergeAllChunks ( ) { int [ ] merged = new int [ chunkSize * numChunks ] ; int filledChunks = Math . min ( numChunks , getFilledChunks ( ) + 1 ) ; for ( int i = 0 ; i < filledChunks ; i ++ ) { if ( chunks [ i ] != null ) { System . arraycopy ( chunks [ i ] , 0 , merged , i * chunkSize , chunkSize ) ; } } if ( defaultValue != 0 ) Arrays . fill ( merged , size ( ) , merged . length , defaultValue ) ; return merged ; }
target:  turn this chunked array into a regular int-array, mostly for compatibility also copying unused space at the end filled with default value