关于NSMutableSet

int main(int argc, const char * argv[]) {

@autoreleasepool {

//1、创建可变set集合

NSMutableSet *set1=[NSMutableSet set];

NSMutableSet *set2=[NSMutableSet setWithObjects:@"1",@"2", nil];

NSMutableSet *set3=[NSMutableSet setWithObjects:@"a",@"2",@"3", nil];

NSMutableSet *set4=[NSMutableSet setWithObjects:@"1",@"3", nil];

NSMutableSet *set5=[NSMutableSet setWithObjects:@"1",@"3",@"b",@"c", nil];

//2、集合2中的元素减去集合3中的元素

[set2 minusSet:set3];

NSLog(@"%@",set2);

//3、求两个集合的交集

[set3 intersectSet:set4];

NSLog(@"%@",set3);

//4、求两个集合的并集

[set2 unionSet:set3];

NSLog(@"%@",set2);

//5、移除集合中的对象

[set2 removeObject:@"1"];//移除一个

NSLog(@"%@",set2);

[set2 removeAllObjects];

NSLog(@"%@",set2);

//6、集合复制

[set2 setSet:set5];

NSLog(@"%@",set2);

}

return 0;

}