I have a problem where it gives me an error "'[' expected but integer literal found"
at initializing the array the string array "arr[i][j]="string";"
for all my initialization. I want to display this 2D array in a table in the HTML view.
As this answer specifies Java
array maps directly into Scala
ones. And also, in Scala
, to access an element in a collection
, you need to use the apply()
method, which is equivalent to the ()
:
val arr = Array.fill(3,3)("hello")
// Displays
//arr: Array[Array[String]] = Array(
// Array("hello", "hello", "hello"),
// Array("hello", "hello", "hello"),
// Array("hello", "hello", "hello")
//)
val row0 = arr.apply(0)
//Displays
//row0: Array[String] = Array("hello", "hello", "hello")
val row1 = arr(1)
//Display
//row1: Array[String] = Array("hello", "hello", "hello")
val elem11 = row1(1)
//elem11: String = "hello"
Here is how you can update an element:
arr(1)(1) = "string"
arr.map(_.mkString(",")).mkString("\n")
// Displays
//res9: String = """hello,hello,hello
//hello,string,hello
//hello,hello,hello"
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.