OC中可变字典和不可变字典

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    //不可改变字典，创建后不可改变

    NSDictionary * dic = [[NSDictionary alloc]initWithObjectsAndKeys:@"jack",@"name",@"18",@"age", nil];
    NSLog(@"%@",dic);
    NSDictionary * dic1 = @{@"name":@"jack",@"age":@"18"};
    NSLog(@"dic1 %@",dic1);

    NSNumber * num = [NSNumber numberWithInt:10];
    NSArray * array = @[@"one",@"two",@"three"];
    NSDictionary * dic2 = @{@"array":array,
                            @"num":num,
                            @"dic":dic
                            };
}

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    NSMutableDictionary * dic =
    [[NSMutableDictionary alloc]
     initWithObjectsAndKeys:@"Tom",@"name" ,@"20",@"age",nil];
}

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