86 lines
2.3 KiB
Java
86 lines
2.3 KiB
Java
// onjava/RandomSupplier.java
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// ©2016 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://mindviewinc.com/Books/OnJava/ for more book information.
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// Suppliers that produce random values.
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package onjava;
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import java.util.*;
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import java.util.function.*;
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public class RandomSupplier {
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private static Random r = new Random(47);
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public static class
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Boolean implements Supplier<java.lang.Boolean> {
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@Override
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public java.lang.Boolean get() {
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return r.nextBoolean();
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}
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}
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public static class
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Byte implements Supplier<java.lang.Byte> {
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@Override
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public java.lang.Byte get() {
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return (byte)r.nextInt();
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}
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}
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public static class
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Character implements Supplier<java.lang.Character> {
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@Override
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public java.lang.Character get() {
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return CountingSupplier.chars[
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r.nextInt(CountingSupplier.chars.length)];
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}
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}
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public static class
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String extends CountingSupplier.String {
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// Plug in the random Character generator:
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{ cg = new Character(); } // Instance initializer
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public String() {}
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public String(int length) { super(length); }
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}
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public static class
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Short implements Supplier<java.lang.Short> {
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@Override
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public java.lang.Short get() {
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return (short)r.nextInt();
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}
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}
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public static class
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Integer implements Supplier<java.lang.Integer> {
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private int mod = 10000;
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public Integer() {}
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public Integer(int modulo) { mod = modulo; }
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@Override
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public java.lang.Integer get() {
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return r.nextInt(mod);
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}
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}
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public static class
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Long implements Supplier<java.lang.Long> {
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private int mod = 10000;
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public Long() {}
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public Long(int modulo) { mod = modulo; }
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@Override
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public java.lang.Long get() {
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return (long) r.nextInt(mod);
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}
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}
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public static class
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Float implements Supplier<java.lang.Float> {
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@Override
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public java.lang.Float get() {
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// Trim all but the first two decimal places:
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int trimmed = Math.round(r.nextFloat() * 100);
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return ((float)trimmed) / 100;
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}
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}
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public static class
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Double implements Supplier<java.lang.Double> {
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@Override
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public java.lang.Double get() {
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long trimmed = Math.round(r.nextDouble() * 100);
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return ((double)trimmed) / 100;
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}
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}
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}
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