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

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// generics/PrimitiveGenericTest.java

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

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

import onjava.*;

import java.util.*;

import java.util.function.*;

// Fill an array using a generator:

interface FillArray {

static <T> T[] fill(T[] a, Supplier<T> gen) {

Arrays.setAll(a, n -> gen.get());

return a;

}

static int[] fill(int[] a, IntSupplier gen) {

Arrays.setAll(a, n -> gen.getAsInt());

return a;

}

static long[] fill(long[] a, LongSupplier gen) {

Arrays.setAll(a, n -> gen.getAsLong());

return a;

}

static double[] fill(double[] a, DoubleSupplier gen) {

Arrays.setAll(a, n -> gen.getAsDouble());

return a;

}

public class PrimitiveGenericTest {

public static void main(String[] args) {

String[] strings = FillArray.fill(

new String[5], new Rand.String(9));

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

int[] integers = FillArray.fill(

new int[9], new Rand.Pint());

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

}

/* Output:

[btpenpccu, xszgvgmei, nneeloztd, vewcippcy, gpoalkljl]

[635, 8737, 3941, 4720, 6177, 8479, 6656, 3768, 4948]