<How can we combine 2 array lists in java [duplica...

# stackoverflow

[user]

How can we combine 2 array lists in java [duplicate]
import java.util.*

fun main(args: Array) {
val firstArray = arrayOf(-1, 2, 3)
val secondArray = arrayOf(1,2,-3,4)

println(Arrays.toString(firstArray))
println(Arrays.toString(secondArray))

val iArray = firstArray.intersect(secondArray.toList()).toIntArray()
println(Arrays.toString(iArray))
}

the above program returned [2]
how can we achieve like [-1,2,3],[1,2,-3,4] would return [[-1,1],[2,2],[3,-3]]