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javaConvert any ArrayList to Array


T[] typedArray = typedList.toArray(T[]::new);ctrl + c
T[]

is an array of reference type T.

typedList

is an ArrayList of type T.

toArray

is a method of ArrayList to convert ArrayList to an Array.

T[]::new

is a method reference of IntFunction<T[]> generator.


Usage example

// initialization of ArrayList
ArrayList<Integer> typedList=new ArrayList<>();
// Adding 1 and 2 to ArrayList
typedList.add(1);
typedList.add(2);
//converting to Integer typed array
Integer[] typedArray = typedList.toArray(Integer[]::new);
// printing array to console
System.out.println(Arrays.toString(typedArray));
output
[1, 2]