static void selectKItems ( int stream [ ] , int n , int k ) {
  int i ;
  int reservoir [ ] = new int [ k ] ;
  for ( i = 0 ;
  i < k ;
  i ++ ) reservoir [ i ] = stream [ i ] ;
  Random r = new Random ( ) ;
  for ( ;
  i < n ;
  i ++ ) {
    int j = r . nextInt ( i + 1 ) ;
    if ( j < k ) reservoir [ j ] = stream [ i ] ;
  }
  System . out . println ( "Following are k randomly selected items" ) ;
  System . out . println ( Arrays . toString ( reservoir ) ) ;
}

static void selectKItems ( int stream [ ] , int n , int k ) { int i ; int reservoir [ ] = new int [ k ] ; for ( i = 0 ; i < k ; i ++ ) reservoir [ i ] = stream [ i ] ; Random r = new Random ( ) ; for ( ; i < n ; i ++ ) { int j = r . nextInt ( i + 1 ) ; if ( j < k ) reservoir [ j ] = stream [ i ] ; } System . out . println ( " Following ▁ are ▁ k ▁ randomly ▁ selected ▁ items " ) ; System . out . println ( Arrays . toString ( reservoir ) ) ; }
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