题外话:scala能使用元组进行打包,返回多个变量,在调用时解构赋值
scala> def useScala() = (1,2,3)
useScala: ()(Int, Int, Int)
scala> val a,b,c = useScala()
a: (Int, Int, Int) = (1,2,3)
b: (Int, Int, Int) = (1,2,3)
c: (Int, Int, Int) = (1,2,3)
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