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  1. import java.util.Arrays;   
  2. import java.util.List;  
  3. import java.util.stream.*;
  4.  
  5. class Main {
  6.   public static void main(String[] args) {
  7.     String [] data = {"europe", "france", "germany", "america"};
  8.     int startIndex = 1;
  9.     int count = 2;
  10.     int newSize = data.length - count + 1;
  11.  
  12.     List<String> output =
  13.         IntStream.range(0, newSize)
  14.                  .mapToObj(n -> Main.getOrJoin(data, startIndex, count, n))
  15.                  .collect(Collectors.toList());
  16.  
  17.     for (String s : output) {
  18.       System.out.println(s);
  19.     }
  20.   }
  21.  
  22.   private static String getOrJoin(String[] data, int joinIndex, int count, int index) {
  23.     if (index < joinIndex) return data[index];
  24.     else if (index > joinIndex) return data[index + count - 1];
  25.     else {
  26.         String[] dataToJoin = Arrays.copyOfRange(data, joinIndex, joinIndex + count);
  27.         return String.join(" ", dataToJoin);
  28.     }
  29.   }
  30. }
Success #stdin #stdout 0.28s 33448KB
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stdin
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Standard input is empty
stdout
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europe
france germany
america
https://ideone.com/H7TRSn
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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