方法:def addString(b: StringBuilder): StringBuilder
return: StringBuilder()
val a = Array(1,2,3,4) # a: Array[Int] = Array(1, 2, 3, 4)
val b = new StringBuilder() # b: StringBuilder =
val c = a.addString(b) # c: StringBuilder = 1234
val a = List(1,2,3,4) # List[Int] = List(1, 2, 3, 4)
val b = new StringBuilder("kv") # b: StringBuilder = kv
val c = a.addString(b) # c: StringBuilder = kv1234
方法：def addString(b: StringBuilder, sep: String): StringBuilder
seq:分割字符
val a = Array(1,2,3,4)# a: Array[Int] = Array(1, 2, 3, 4)
val b = new StringBuidler()# b: StringBuilder =
val c = a.addString(b,"--")# c: StringBuilder = 1--2--3--4
val a = Array(1,2,3,4)# a: Array[Int] = Array(1, 2, 3, 4)
val b = new StringBuilder("kv")# b: StringBuilder = kv
val c = a.addString(b,"--")# c: StringBuilder =kv1--2--3--4
val a = Array(1,2,3,4)# a: Array[Int] = Array(1, 2, 3, 4)
val b = new StringBuilder("kv")# b: StringBuilder = kv
val c = a.addString(b,"**")# c: StringBuilder =kv1**2**3**4
方法：def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder
start:开始字符
end:结束字符
seq:分割字符
val a = Array(1,2,3,4)# a: Array[Int] = Array(1, 2, 3, 4)
val b = new StringBuilder() # b: StringBuilder =
val c = a.addString(b,"ss","--","eed")#c: StringBuilder = ss1--2--3--4eed
val a = Array(1,2,3,4)# a: Array[Int] = Array(1, 2, 3, 4)
val b = new StringBuilder("kv") # b: StringBuilder = kv
val c = a.addString(b,"ss","--","eed")#c: StringBuilder = kvss1--2--3--4eed
val a = Array(1,2,3,4)# a: Array[Int] = Array(1, 2, 3, 4)
val b = new StringBuilder("kv") # b: StringBuilder = kv
val c = a.addString(b,"List(",",",")")#c: StringBuilder = kvList(1,2,3,4)
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