convert multi array into single array(java) -

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Is it possible to copy data from multiple [] [] to single []?!? 

  Dual multi [] [] = {{1.0, 2.0}, {2.11, 204.00, 11.00, 34.00}, {66.5,43.3,18 9.6}};  
 
 to  
  double single [] = {1.0, 2.0, 2.11, 204.00, 11.0, 66.5,43.3189.6}   
  double [] single = array 
  
 
 < P>. Stream (multi) // creates a stream & lt; Double [] & gt; .flatMapToDouble (Arrays :: stream) // merges the array into a double stream .toArray (); // collects everything in a double [] array

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