union To Hash Set - Java Collection Framework

Java examples for Collection Framework:Set

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Description

union To Hash Set

Demo Code


import java.util.*;

public class Main{
    public static void main(String[] argv){
        Collection collections = java.util.Arrays.asList("asdf","java2s.com");
        System.out.println(unionToHashSet(collections));
    }// w  w w. java2 s .c  o  m
    public static <T> HashSet<T> unionToHashSet(
            final Collection<T>... collections) {
        final HashSet<T> res = new HashSet<T>();
        for (final Collection<T> set : collections) {
            res.addAll(set);
        }
        return res;
    }
    public static <T> HashSet<T> unionToHashSet(
            final Collection<T> collection, final T... items) {
        final HashSet<T> result = new HashSet<T>();
        result.addAll(collection);
        Collections.addAll(result, items);
        return result;
    }
}

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