import DrawGraphic.coin
abstract class DrawGraphic {
val contents: Array[String]
def higth: Int = contents.length
def width: Int = if(higth == 0) 0 else contents(0).length
//左右连接的方法
def connect(that: DrawGraphic): DrawGraphic =
{
val this1 = this.comparehigth(that.higth)
val that1 = that.comparehigth(higth)
coin(this1.contents ++ that1.contents)
}
//上下连接的方法
def splice(that: DrawGraphic): DrawGraphic =
{
val this1 = this.comparewidth(that.width)
val that1 = that.comparewidth(width)
coin(
for((line1,line2) <- this1.contents zip that1.contents)
yield line1 + line2)
}
override def toString = contents.mkString("\n" )
//比较宽度的辅助方法
def comparewidth(n: Int): DrawGraphic =
{
if(n <= width)
this
else
{
val left = coin('-',(n-width)/2,higth)
val right = coin('-',n-width-left.width,higth)
left connect this connect right
}
}
//比较高度的辅助方法
def comparehigth(h: Int): DrawGraphic =
{
if(h <= higth)
this
else
{
val top = coin('+',width,(h-higth)/2)
val bot = coin('+',width,h-higth-top.higth)
top splice this splice bot
}
}
}
//伴生对象及工厂方法
object DrawGraphic {
class ArrayDraw(val contents: Array[String]) extends DrawGraphic
private class LineDraw(line: String) extends DrawGraphic {
val contents = Array(line)
override val width = line.length
override val higth = 1
}
private class Graphic(ch: Char,width: Int,higth: Int) extends DrawGraphic {
private val lines = ch.toString * width
val contents = Array.fill(higth)(lines)
}
def coin(contents: Array[String]): DrawGraphic = new ArrayDraw(contents)
def coin(line: String): DrawGraphic = new LineDraw(line)
def coin(ch: Char,width: Int,higth: Int): DrawGraphic = new Graphi(ch,width,higth)
}
以上代码就是书上的例子，写完后，自己new了一个实例运行进行测试，发现结果跟预期不一样，求Scala高手指点：println(new ArrayDraw(Array("Mouse")) connect new ArrayDraw(Array("Cat")))
Scala ?编程
------解决方案--------------------
Scala代码写的和java一样，:-(