Demonstrating lambdas and streams with an array of Integers. - Java Lambda Stream

Java examples for Lambda Stream:Stream

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Description

Demonstrating lambdas and streams with an array of Integers.

Demo Code


import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

public class Main
{
   public static void main(String[] args)
   {/*from ww w . j  a v a  2s.  co m*/
      Integer[] values = {12, 19, 5, 10, 3, 17, 1, 4, 8, 6};

      // display original values
      System.out.printf("Original values: %s%n", Arrays.asList(values));

      // sort values in ascending order with streams
      System.out.printf("Sorted values: %s%n", 
         Arrays.stream(values)
               .sorted()
               .collect(Collectors.toList()));

      // values greater than 4
      List<Integer> greaterThan4 =
         Arrays.stream(values)
               .filter(value -> value > 4)
               .collect(Collectors.toList());
      System.out.printf("Values greater than 4: %s%n", greaterThan4);

      // filter values greater than 4 then sort the results
      System.out.printf("Sorted values greater than 4: %s%n",
         Arrays.stream(values)
               .filter(value -> value > 4)
               .sorted()
               .collect(Collectors.toList()));

      // greaterThan4 List sorted with streams
      System.out.printf(
         "Values greater than 4 (ascending with streams): %s%n",
         greaterThan4.stream()
               .sorted()
               .collect(Collectors.toList()));
   }
}

Result


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