public static void main(String[] args) {
		// 测试union
		String[] arr1 = { "abc", "df", "abc" };
		String[] arr2 = { "abc", "cc", "df", "d", "abc" };
		String[] result_union = union(arr1, arr2);
		System.out.println("求并集的结果如下：");
		for (String str : result_union) {
			System.out.println(str);
		}
		System.out
				.println("---------------------可爱的分割线------------------------");

		// 测试insect
		String[] result_insect = intersect(arr1, arr2);
		System.out.println("求交集的结果如下：");
		for (String str : result_insect) {
			System.out.println(str);
		}

		System.out
				.println("---------------------疯狂的分割线------------------------");
		// 测试minus
		String[] result_minus = minus(arr1, arr2);
		System.out.println("求差集的结果如下：");
		for (String str : result_minus) {
			System.out.println(str);
		}
	}