The difference between intermediate operations and terminal operations in Java 8

Stream was introduced in Java 8 and it is only used to process a set of data and not to sort the elements. It does not modify the actual collection, they only provide results according to the pipeline method.

The Stream API supports multiple operations, which are divided into two parts:

• Intermediate Operation- These operations are used to pipe other methods and convert to other streams. They produce no results because these operations are not called until the terminal operation is performed. Here is an example:
• sorted(Comparator)
• peek(Consumer)
• distinct()
• Terminal operations - These operations used to generate results. They cannot be used to chain other methods. Here is an example:
• forEach
• count
• toArray

public class Main {
   public static void main(String args[]) throws InterruptedException, ExecutionException {
      List<String> laptopList = new ArrayList();
      laptopList.add("DELL");
      laptopList.add("ACER");
      laptopList.add("HCL");

      // Intermediate operation
      laptopList.sort((p1, p2) -> p1.compareTo(p2));

      // Terminal Operation
      laptopList.forEach(a -> {
         System.out.println(a);
      });
   }
}

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