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Kotlin, Sử dụng $ để sử dụng trong String println("…

- - - - Double
      - Float
        1.3f
    - - Long
        1.3L
      - Int
      - Short
      - Byte
  - - - var arr:DoubleArray =doubleArrayOf(1.3,1.4,4.1)
    - - M.max()
      - M.min()
      - M.filter { x->x%2==0}
    - - var M:Array<IntArray> = Array(10,{ IntArray(5) })
  - - - int -> long -> float -> double
    - - double -> float -> long -> int
- - - - class SinhVien constructor(ma:Int, ten:String)
        init { }
    - - class SanPham{
        copnstructor(code:Int, name:String)
        }