#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
NSArray *arr1 = [NSArray arrayWithObjects:@"one",@"tow", nil];
//等价于
NSArray *arr2 = @[@"one",@"two"];//不可变数组才有这种特性
NSLog(@"%@ %@",arr1,arr2);
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two", nil];
NSLog(@"dict:%@",dict);
NSDictionary *dict2 = @{@"one": @"1",@"two":@"2"};
NSLog(@"dict2:%@",dict2);
//NSString *str = [dict2 objectForKey:@"one"];
//等价于新特性
NSString * str = dict2[@"one"];
NSLog(@"str:%@",str);//str:1
}
return 0;
}
转载于:https://my.oschina.net/u/2410306/blog/520043