Check if two collection are Equal - Java java.util

Java examples for java.util:Collection Compare

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Description

Check if two collection are Equal

Demo Code


import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class Main{
    public static <T> Boolean areEqual(final Collection<T> collection1,
            final Collection<T> collection2, Comparator<T> comparator) {
        if (!areSameSize(collection1, collection2))
            return Boolean.FALSE;

        ArrayList<T> sortedList1 = new ArrayList<T>(collection1.size());
        sortedList1.addAll(collection1);
        Collections.sort(sortedList1, comparator);

        ArrayList<T> sortedList2 = new ArrayList<T>(collection2.size());
        sortedList2.addAll(collection2);
        Collections.sort(sortedList2, comparator);

        return collection1.equals(collection2);
    }/*from ww w  .  j ava 2  s . c  o  m*/
    public static <T> Boolean areSameSize(final Collection<T> collection1,
            final Collection<T> collection2) {
        if (isEmpty(collection1) && isEmpty(collection2))
            return Boolean.TRUE;

        if (collection1 == collection2)
            return Boolean.TRUE;

        if (isNotEmpty(collection1) && isNotEmpty(collection2)
                && (collection1.size() - collection2.size()) == 0)
            return Boolean.TRUE;

        return Boolean.FALSE;
    }
    public static <T> Boolean isEmpty(Collection<T> collection) {
        if (GeneralUtil.isNull(collection))
            return Boolean.TRUE;

        return collection.isEmpty();
    }
    public static <T> Boolean isNotEmpty(Collection<T> collection) {
        return !isEmpty(collection);
    }
}

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