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How to create a constructor reference for an array in Java?
A constructor reference is similar to method reference except that the name of a method is new. We can also create a constructor reference with an array type. For instance, if we need to create an integer array by using the constructor reference: int[]:: new, where the parameter is a length of an array.
Syntax
ArrayTypeName[]::new
Example
@FunctionalInterface
interface ArrayCreator {
int[] makeArray(int number);
}
public class ArrayConstructorRefTest {
public static void main(String[] args) {
ArrayCreator arrayCreator = int[]::new; // Constructor Reference for an Array
int[] intArray = arrayCreator.makeArray(10);
for(int i = 0; i < intArray.length; i++) {
intArray[i] = i * i - i / 2;
System.out.println("[" + i + "] = " + intArray[i]);
}
}
}Output
[0] = 0 [1] = 1 [2] = 3 [3] = 8 [4] = 14 [5] = 23 [6] = 33 [7] = 46 [8] = 60 [9] = 77
Updated on: 14-Jul-2020
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