如何将另一个字符串添加到string another？

var another = "另一个字符串";
var str = "string ";
var result = str + another;
console.log(result);

another = "另一个字符串"
str = "string "
result = str + another
print(result)

String another = "另一个字符串";
String str = "string ";
String result = str + another;
System.out.println(result);

string another = "另一个字符串";
string str = "string ";
string result = str + another;
Console.WriteLine(result);