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

Java examples for Lambda Stream:Stream

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Description

Demonstrating lambdas and streams with an array of Strings.

Demo Code


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

public class Main
{
   public static void main(String[] args)
   {//  www. j  a  va 2  s . c  o  m
      String[] strings = 
         {"Red", "orange", "Yellow", "green", "Blue", "indigo", "Violet"};

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

      // strings in uppercase
      System.out.printf("strings in uppercase: %s%n",
         Arrays.stream(strings)
               .map(String::toUpperCase)
               .collect(Collectors.toList()));

      // strings greater than "m" (case insensitive) sorted ascending
      System.out.printf("strings greater than m sorted ascending: %s%n",
         Arrays.stream(strings)
               .filter(s -> s.compareToIgnoreCase("m") > 0)
               .sorted(String.CASE_INSENSITIVE_ORDER)
               .collect(Collectors.toList()));

      // strings greater than "m" (case insensitive) sorted descending
      System.out.printf("strings greater than m sorted descending: %s%n",
         Arrays.stream(strings)
               .filter(s -> s.compareToIgnoreCase("m") > 0)
               .sorted(String.CASE_INSENSITIVE_ORDER.reversed())
               .collect(Collectors.toList()));
   }
}

Result


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