HashSet used to remove duplicate values from array of strings. - Java Collection Framework

Java examples for Collection Framework:HashSet

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Description

HashSet used to remove duplicate values from array of strings.

Demo Code

import java.util.List;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.Collection;

public class Main 
{
   public static void main(String[] args)
   {//  ww  w.j a  v a2  s .  c  o m
      // create and display a List<String>
      String[] colors = {"red", "white", "blue", "green", "gray", 
         "orange", "tan", "white", "cyan", "peach", "gray", "orange"};
      List<String> list = Arrays.asList(colors);
      System.out.printf("List: %s%n", list);

      // eliminate duplicates then print the unique values
      printNonDuplicates(list);
   }  

   // create a Set from a Collection to eliminate duplicates
   private static void printNonDuplicates(Collection<String> values)
   {
      // create a HashSet 
      Set<String> set = new HashSet<>(values);   

      System.out.printf("%nNonduplicates are: ");

      for (String value : set)
         System.out.printf("%s ", value);

      System.out.println();
   } 
}

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