OnJava8-Examples/generics/ArrayMaker.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// generics/ArrayMaker.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.lang.reflect.*;

import java.util.*;

public class ArrayMaker<T> {

private Class<T> kind;

public ArrayMaker(Class<T> kind) { this.kind = kind; }

@SuppressWarnings("unchecked")

T[] create(int size) {

return (T[])Array.newInstance(kind, size);

}

public static void main(String[] args) {

ArrayMaker<String> stringMaker =

new ArrayMaker<>(String.class);

String[] stringArray = stringMaker.create(9);

System.out.println(Arrays.toString(stringArray));

}

/* Output:

[null, null, null, null, null, null, null, null, null]