Get the difference of two collections : Collection « Collections Data Structure « Java

Get the difference of two collections


import java.util.ArrayList;
import java.util.Collection;

public class Utils {

  public static <T> Collection<T> diff(Collection<T> c1, Collection<T> c2) {
    if (c1 == null || c1.size() == 0 || c2 == null || c2.size() == 0) {
        return c1;
    Collection<T> difference = new ArrayList<T>();
    for (T item : c1) {
        if (!c2.contains(item)) {
    return difference;



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