scala获取字符串首字符和尾字符
获取第一个元素
take()
scala> "hello".take(1)
res12: String = h
索引法
因为字符串的本质是字符数组
scala> "hello"(0)
res13: Char = h
字符串截取
scala> "hello".substring(0,1)
res15: String = h
获取最后一个元素
先反转再获取第一个
scala> "Hello".reverse.take(1)
res11: String = o
takeRight()
scala> "hello".takeRight(1)
res14: String = o
字符串截取
scala> "hello".substring("hello".length-1)
res16: String = o
last函数截取
scala> "hello".last
res1: Char = o