集合老师

1

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
       
        NSSet  *set=[NSSet set];
        NSSet *set1=[NSSet setWithObjects:@"jack",@"rose",nil];
        //存取数据的个数
        NSInteger count=[set1 count];
        NSLog(@"%ld",count);
    
        //随机拿取元素
    
        NSString *str=[set1 anyObject];
        NSLog(@"%@",str);
        //通过数组创建集合
        NSArray *arr=[NSArray arrayWithObjects:@"jack",@"rose",@"2", @"9",@"3",nil];
        NSSet *set2=[[NSSet alloc]initWithArray:arr];
        //集合中是否包含内容为“1”这个字符串对象
        BOOL result =[set2 containsObject:@"7"];
        NSLog(@"%d",result);
        //判断两个集合是否含有相同的元素
        BOOL result1=[set1 intersectsSet:set2];
        NSLog(@"%d",result1);

        //集合1是否是集合2的子集合
        BOOL result2=[set1 isSubsetOfSet:set2];
        NSLog(@"%d",result2);
    }
    return 0;
}

2

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
       
        NSMutableSet *set1=[NSMutableSet set];
        NSMutableSet *set2=[NSMutableSet setWithObjects:@"1",@"2",nil];
        NSMutableSet *set3=[NSMutableSet setWithObjects:@"a",@"2" ,nil];
        
        //集合2减去集合3中元素,最后集合2中的元素只剩1个，值为1；
        NSLog(@"%@",set2);
        NSLog(@"%@",set3);
        //[set2 minusSet:set3];
        //NSLog(@"%@",set2);
       // NSLog(@"%@",set3);
        //集合2与集合3交集，最后集合2中的元素只有1个，值为2
       // [set2 intersectSet:set3];
       // NSLog(@"%@",set2);
       // NSLog(@"%@",set3);
        //集合2与结合3并集,最后集合2中的元素只有3个 1，2，a
        [set2 unionSet:set3];
        NSLog(@"%@",set2);
        NSLog(@"%@",set3);
        [set2 removeObject:@"2"];
        NSLog(@"%@",set2);
        [set1 setSet:set2];
        NSLog(@"%@",set1);
    }
    return 0;
}

 

转载于:https://www.cnblogs.com/hezhuangzhuang/p/5121744.html