在字符串变量中替换变量

Question

在以下示例中，我需要变量x2结束时使用值my name is Paul而不是my name is $name，这可能吗？

scala> val name = "Paul"
name: String = Paul

scala> val xxx = s"my name is $name"
xxx: String = my name is Paul

scala> val x1 = "my name is $name"
x1: String = my name is $name

scala> val x2 = s"" + x1
x2: String = my name is $name

Answer 1

字符串插值不适合这里，因为您要格式化现有字符串。您想使用字符串的C样式格式：

println("my name is %s".format("paul"))

如果你想（尽管我没有理由），你可以直接使用StringContext：

scala> val name = "paul"
name: String = paul

scala> StringContext("My name is ", "").s(name)
res1: String = My name is paul

Answer 2

这有效：

scala> val x4 = "my name is %s"
x4: String = my name is %s

scala> x4.format("Paul")
res3: String = my name is Paul