Object C (2) --- NSString的建立

        nsstring

*str1 = @"a string";

        nsstring *str2

= [[nsstring alloc] init];

        str2 = @"a

string";

        [str2 release];

        nsstring *str3

= [[nsstring alloc] initwithstring:@"a string"];

        [str3 release];

        nsstring *str4

= [nsstring stringwithstring:@"a string"];

        [str4 release];

        nsstring *str5

= [[nsstring alloc] initwithutf8string:"a string"];

        [str5 release];

        nsstring *str6

= [nsstring stringwithutf8string:"a string"];

        nsstring *str7

= [nsstring stringwithformat:@"a string %d", 5];

        nslog(@"%@",str7);