@interface Person : NSObject {
@public NSString *name; @private int age;
}
@property(copy) NSString *name; @property(readonly) int age;
-(id)initWithAge:(int)age; @end
NSArray *arrayLiteral = @[@“abc”, @1]; NSDictionary *dictLiteral = @{
@"hello": @"world", @"goodbye": @"cruel world"
};