objective-c的NSMutableDictionary增改删测试

最新推荐文章于 2025-04-18 16:28:55 发布

原创最新推荐文章于 2025-04-18 16:28:55 发布 · 368 阅读

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#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        NSLog(@"Hello, World!");
        NSMutableDictionary *data = [[NSMutableDictionary alloc] init];
        [data setValue:@"123" forKey:@"1"];
        [data setValue:@"456" forKey:@"2"];
        NSLog(@"data=%@",data);
        [data setValue:@"789" forKey:@"2"];
        NSLog(@"data=%@",data);
        [data setValue:nil forKey:@"2"];
        NSLog(@"data=%@",data);
        id d = [data objectForKey:@"1"];
        NSLog(@"1 = %@",d);
    }
    return 0;
}

结果：

2016-12-06 18:10:44.821141 dataTest[3088:124274] Hello, World!

2016-12-06 18:10:44.825078 dataTest[3088:124274] data={

1 = 123;

2 = 456;

}

2016-12-06 18:10:44.825865 dataTest[3088:124274] data={

1 = 123;

2 = 789;

}

2016-12-06 18:10:44.825925 dataTest[3088:124274] data={

1 = 123;