question: private static Entry [ ] concat ( Entry [ ] attrs1 , Entry [ ] attrs2 ) { Entry [ ] nattrs = new Entry [ attrs1 . length + attrs2 . length ] ; System . arraycopy ( attrs1 , 0 , nattrs , 0 , attrs1 . length ) ; System . arraycopy ( attrs2 , 0 , nattrs , attrs1 . length , attrs2 . length ) ; return nattrs ; }
target:  Return a concatenation of the two arrays.