Scala的对字符串应用

1.trimEnd：截取末尾几个长度的字符串

import scala.collection.mutable.ArrayBuffer

val a = ArrayBuffer[Int]()
a+=(1,2,3,4,5)

a.trimEnd(3)    

a
res15: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(1, 2)