Array基本操作

 // defined array object
     val arr0= new Array[String]()
     val arr1= Array("Hello","")
     println(arr1())
     arr1()="Hello Spark!"
     println(arr1())
     // array's length can't change,but ArrayBuffer can.
 
     val arr2= ArrayBuffer()
     arr2+=
     for(item <- arr2) println(item)
     arr2+=(,,,)
     println(arr2.mkString(","))
     arr2++=Array(,,)
     println(arr2.mkString(","))
     arr2.trimEnd()
     println(arr2.mkString(","))
     arr2.insert(,)
     println(arr2.mkString(","))
     arr2.insert(,,,)
     println(arr2.mkString(","))
     arr2.remove()
     println(arr2.mkString(","))
     arr2.remove(,)
     println(arr2.mkString(","))
     println(arr2.toArray.mkString(","))

输出结果：

Hello
Hello Spark!
1
1
1,1,2,3,4,5
1,1,2,3,4,5,6,7,8
1,1,2,3
1,1,6,2,3
1,1,5,5,6,6,2,3
1,1,5,5,6,2,3
1,2,3
1,2,3

Process finished with exit code 0

 val arr3=Array(,,,,,)
     for(i<- until arr3.length) println(i+":"+arr3(i))
     for(elem<-arr3) println(elem)
 
     val result= for(elem<-arr3) yield *elem;
     println(result.mkString(","))
     var result0 = for(elem<-arr3 if elem%==) yield *elem;
     println(result0.mkString(","))
     println(arr3.filter(_%==).map(*_).mkString(","))
 
     println(arr3.sum)
     val arr4= Array(,,,,)
     val result3= scala.util.Sorting.quickSort(arr4)
     println(arr4.mkString("<",",",">"))
 
     val arr5=ArrayBuffer(,,,,,,)
     println(arr5.sorted.mkString(","))
 
     val matrix= Array.ofDim[Double](,)
     for(i<-  to ;j<-  to ) println("matrix("+i+")("+j+"):"+matrix(i)(j))
     matrix()()=
     for(i<-  to ;j<-  to ) println("matrix("+i+")("+j+"):"+matrix(i)(j))
     var triangle= new Array[Array[Int]]()
     for(i<- until(triangle.length)) triangle(i)= new Array[Int](i+)

0:1
1:2
2:3
3:4
4:5
5:6
1
2
3
4
5
6
2,4,6,8,10,12
4,8,12
4,8,12
21
<1,3,3,5,10>
0,1,3,4,4,5,10
matrix(0)(0):0.0
matrix(0)(1):0.0
matrix(0)(2):0.0
matrix(0)(3):0.0
matrix(1)(0):0.0
matrix(1)(1):0.0
matrix(1)(2):0.0
matrix(1)(3):0.0
matrix(2)(0):0.0
matrix(2)(1):0.0
matrix(2)(2):0.0
matrix(2)(3):0.0
matrix(0)(0):0.0
matrix(0)(1):0.0
matrix(0)(2):0.0
matrix(0)(3):0.0
matrix(1)(0):0.0
matrix(1)(1):23.0
matrix(1)(2):0.0
matrix(1)(3):0.0
matrix(2)(0):0.0
matrix(2)(1):0.0
matrix(2)(2):0.0
matrix(2)(3):0.0

Process finished with exit code 0