47 lines
1.3 KiB
Java
47 lines
1.3 KiB
Java
// generics/PrimitiveGenericTest.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import onjava.*;
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import java.util.*;
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import java.util.function.*;
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// Fill an array using a generator:
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interface FillArray {
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static <T> T[] fill(T[] a, Supplier<T> gen) {
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for(int i = 0; i < a.length; i++)
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a[i] = gen.get();
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return a;
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}
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static int[] fill(int[] a, IntSupplier gen) {
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for(int i = 0; i < a.length; i++)
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a[i] = gen.getAsInt();
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return a;
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}
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static long[] fill(long[] a, LongSupplier gen) {
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for(int i = 0; i < a.length; i++)
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a[i] = gen.getAsLong();
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return a;
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}
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static double[] fill(double[] a, DoubleSupplier gen) {
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for(int i = 0; i < a.length; i++)
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a[i] = gen.getAsDouble();
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return a;
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}
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}
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public class PrimitiveGenericTest {
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public static void main(String[] args) {
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String[] strings = FillArray.fill(
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new String[5], new Rand.String(9));
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System.out.println(Arrays.toString(strings));
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int[] integers = FillArray.fill(
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new int[9], new Rand.Pint());
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System.out.println(Arrays.toString(integers));
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}
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}
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/* Output:
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[btpenpccu, xszgvgmei, nneeloztd, vewcippcy, gpoalkljl]
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[635, 8737, 3941, 4720, 6177, 8479, 6656, 3768, 4948]
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*/
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