thirumurthi

Java 8 lambda use cases

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Thirumurthi S
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1 min read

Converting int[] to List of Integer

Using Arrays.stream() we can convert like below

public static void main(String ... str){
    int input[] = {2,3,4,4,5,5,5,6,6,6,6,6,9,9,10,10,11,11,11,11,11,11,11,11,15};
   List<Integer> print = Arrays.stream(input).boxed().collect(Collectors.toList());
}

Converting String to Character array

Using String chars() method and mapToObj, we can convert String to char array like below

public static void main(String ... str){
  String input= "somestring";
  Character[] inAsCharArray = input.chars().mapToObj(item -> (char)item).toArray(Character[]::new);
}

Converting String to List of Integer

Using String chars() we can convert each chars to its ASCII equivalent. 

public static void main (String ... str){
          String romanStr = "IVXLD";        
        List<Integer> charlist= romanStr.chars().boxed().collect(Collectors.toList());
}
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