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Clover is an award winning code coverage and testing tool for Java and Groovy. It integrates easily with Maven, Ant, Grails, Eclipse and IntelliJ IDEA as well as with continuous integration servers such as Bamboo, Jenkins or Hudson. Note: before Clover 4.0 this artifact was named com.cenqua.clover:clover.

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package org.openclover.util;

import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.TreeSet;

public abstract class Sets {
    public static  HashSet newHashSet() {
        return new HashSet<>();
    }

    @SafeVarargs
    public static  HashSet newHashSet(S... items) {
        final HashSet set = new HashSet<>(items.length);
        Collections.addAll(set, items);
        return set;
    }

    public static  HashSet newHashSet(Collection items) {
        return new HashSet<>(items);
    }

    public static  LinkedHashSet newLinkedHashSet() {
        return new LinkedHashSet<>();
    }

    public static  LinkedHashSet newLinkedHashSet(Collection items) {
        return new LinkedHashSet<>(items);
    }

    public static > TreeSet newTreeSet() {
        return new TreeSet<>();
    }

    public static  TreeSet newTreeSet(Comparator comparator) {
        return new TreeSet<>(comparator);
    }
}