4. Scala array

1. Array

2, ArrayBuffer

3. Traversing array and Arraybuffer

4. Common Array Operations

1. Array

In Scala, array stands for a similar meaning to Java and is an immutable array of lengths. Since both Scala and Java are running in the JVM, the two sides can call each other, and the underlying implementation of the Scala array is actually a Java array.

　　

2, ArrayBuffer

In Scala, if you need a variable-length collection class, you can use Arraybuffer. You need to import scala.collection.mutable.ArrayBuffer before use.

Create an empty arraybuffer:val B=arraybuffer[int] ()

Add an element using + = B+=1 b+= (2,3,4,5)

Add all elements from another collection B++=array (6,7,8)

Truncates the specified number of elements from the tail b.trimend (5)

Specify position Insert element B.insert (0,9,10)

Removes the element b.remove (1,3) from the specified position

Array and Arraybuffer convert each other B.toarray A.tobuffer

　　

3. Traversing array and Arraybuffer

Using for loops and until traversal

　　

Jump traversal

　　

Trailing traverse

　　

Using the enhanced for loop traversal

　　

4. Common Array Operations

Array element summation A.sum

Get maximum value A.max

Sort an array scala.util.Sorting.quickSort (a)

Gets the contents of all elements in the array a.mkstring a.mkstring (",") a.mkstring ("(", ",", ")")

toString function a.tostring

　　

4. Scala array