Java SE: Tips_JAVA_编程开发_程序员俱乐部

1. How to compare equals for two List:

? ? 1> Writing boiler plate code

? ? 2> Using org.apache.commons.collections.ListUtils.isEqualList()

class="java" name="code">public static boolean isEqualList(final Collection list1, final Collection list2) {
    if (list1 == list2) {
        return true;
    }
    if (list1 == null || list2 == null || list1.size() != list2.size()) {
        return false;
    }

    Iterator it1 = list1.iterator();
    Iterator it2 = list2.iterator();
    Object obj1 = null;
    Object obj2 = null;

    while (it1.hasNext() && it2.hasNext()) {
        obj1 = it1.next();
        obj2 = it2.next();

        if (!(obj1 == null ? obj2 == null : obj1.equals(obj2))) {
            return false;
        }
    }

    return !(it1.hasNext() || it2.hasNext());
}

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2. How to compare equals for two Set:

? ? 1> Using org.apache.commons.collections.SetUtils.isEqualSet()

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