Swift入门之字符串联接---语言大比拼

效果输出：  I'm apple! 77 I'm orange!

PHP版：

$apple="I'm apple!";
$orange="I'm orange!";
$number=77;
$link=$apple." ".$number." ".$orange;
echo $link;

JAVA版：

String apple="I'm apple!";
String orange="I'm orange!";
int number=77;
String link=apple+" "+number+" "+orange;
System.out.println(link);

Object-C版：

NSString *apple=@"I'm apple!";
NSString *orange=@"I'm orange!";
int number=77;
NSMutableString *link=[NSMutableString stringWithString:@""];
[link appendString:apple];
[link appendString:@" "];
[link appendString:[NSString stringWithFormat: @"%d", number]];
[link appendString:@" "];
[link appendString:orange];
NSLog(@"%@",link);

Swift版：（注意数字的不支持隐式转换）

let apple="I'm apple!"
let orange="I'm orange!"
let number=77
var link=apple+" "+String(number)+" "+orange
println(link)

以上几种语言你更喜欢哪种呢？