public class Main {
public static void main(String[] args) throws Exception {
String[] arr1 = { "1", "2", "3" };
String[] arr2 = { "4", "5", "6" };
String[] result_union = union(arr1, arr2);
System.out.println("并集的结果如下：");

for (String str : result_union) {
System.out.println(str);
}
}

// 求两个字符串数组的并集，利用set的元素唯一性
public static String[] union(String[] arr1, String[] arr2) {
Set<String> set = new HashSet<String>();

for (String str : arr1) {
set.add(str);
}

for (String str : arr2) {
set.add(str);
}

String[] result = { };

return set.toArray(result);
}
}