java - 哈希集对象

Question

我正在编写一段代码，它需要大量对象并将它们添加到另一个数组中。问题是，我不想要任何重复的。有没有办法实现哈希集来解决这个问题？

    public static Statistic[] combineStatistics(Statistic[] rptData, Statistic[] dbsData) {
    HashSet<Statistic> set = new HashSet<Statistic>();
    for (int i=0; i<rptData.length; i++) {
        set.add(rptData[i]);
    }
    /*If there's no data in the database, we don't have anything to add to the new array*/
    if (dbsData!=null) {
        for (int j=0; j<dbsData.length;j++) {
            set.add(dbsData[j]);
        }
    }
    Statistic[] total=set.toArray(new Statistic[0]);
    for (int workDummy=0; workDummy<total.length; workDummy++) {
        System.out.println(total[workDummy].serialName);
    }

    return total;
}//end combineStatistics()

Answer 1

如果您希望值相等而不是引用相等，请在 YourObject 上正确实现 equals(Object obj) 和 hashCode()。

Set<YourObject> set = new HashSet<YourObject>(yourCollection);

或

Set<YourObject> set = new HashSet<YourObject>();
set.add(...);

然后

YourObject[] array = set.toArray(new YourObject[0])