利用guava找出数据的交集，并集，差集

public static void main(String[] args) {
		Set set1=Sets.newHashSet(1,2,3,4,5);
		Set set2=Sets.newHashSet(3,4,5,6,7);
		
		//交集
		System.out.println("交集为：");
		SetView intersection=Sets.intersection(set1, set2);
		for (Integer integer : intersection) {
			System.out.println(integer);
		}
		
		
		//差集
		System.out.println("差集为：");
		SetView diff=Sets.difference(set1, set2);
		for (Integer integer : diff) {
			System.out.println(integer);
		}
		//并集
		System.out.println("并集为：");
		SetView union=Sets.union(set1, set2);
		for (Integer integer : union) {
			System.out.println(integer);
		}
	}