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248 lines (247 loc) · 6.49 KB
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// onjava/Rand.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Generate random values of different types
package onjava;
import java.util.*;
import java.util.function.*;
import static onjava.ConvertTo.*;
public interface Rand {
int MOD = 10_000;
class Boolean
implements Supplier<java.lang.Boolean> {
SplittableRandom r = new SplittableRandom(47);
@Override
public java.lang.Boolean get() {
return r.nextBoolean();
}
public java.lang.Boolean get(int n) {
return get();
}
public java.lang.Boolean[] array(int sz) {
java.lang.Boolean[] result =
new java.lang.Boolean[sz];
Arrays.setAll(result, n -> get());
return result;
}
}
class Pboolean {
public boolean[] array(int sz) {
return primitive(new Boolean().array(sz));
}
}
class Byte
implements Supplier<java.lang.Byte> {
SplittableRandom r = new SplittableRandom(47);
@Override
public java.lang.Byte get() {
return (byte)r.nextInt(MOD);
}
public java.lang.Byte get(int n) {
return get();
}
public java.lang.Byte[] array(int sz) {
java.lang.Byte[] result =
new java.lang.Byte[sz];
Arrays.setAll(result, n -> get());
return result;
}
}
class Pbyte {
public byte[] array(int sz) {
return primitive(new Byte().array(sz));
}
}
class Character
implements Supplier<java.lang.Character> {
SplittableRandom r = new SplittableRandom(47);
@Override
public java.lang.Character get() {
return (char)r.nextInt('a', 'z' + 1);
}
public java.lang.Character get(int n) {
return get();
}
public java.lang.Character[] array(int sz) {
java.lang.Character[] result =
new java.lang.Character[sz];
Arrays.setAll(result, n -> get());
return result;
}
}
class Pchar {
public char[] array(int sz) {
return primitive(new Character().array(sz));
}
}
class Short
implements Supplier<java.lang.Short> {
SplittableRandom r = new SplittableRandom(47);
@Override
public java.lang.Short get() {
return (short)r.nextInt(MOD);
}
public java.lang.Short get(int n) {
return get();
}
public java.lang.Short[] array(int sz) {
java.lang.Short[] result =
new java.lang.Short[sz];
Arrays.setAll(result, n -> get());
return result;
}
}
class Pshort {
public short[] array(int sz) {
return primitive(new Short().array(sz));
}
}
class Integer
implements Supplier<java.lang.Integer> {
SplittableRandom r = new SplittableRandom(47);
@Override
public java.lang.Integer get() {
return r.nextInt(MOD);
}
public java.lang.Integer get(int n) {
return get();
}
public java.lang.Integer[] array(int sz) {
int[] primitive = new Pint().array(sz);
java.lang.Integer[] result =
new java.lang.Integer[sz];
for(int i = 0; i < sz; i++)
result[i] = primitive[i];
return result;
}
}
class Pint implements IntSupplier {
SplittableRandom r = new SplittableRandom(47);
@Override
public int getAsInt() {
return r.nextInt(MOD);
}
public int get(int n) { return getAsInt(); }
public int[] array(int sz) {
return r.ints(sz, 0, MOD).toArray();
}
}
class Long
implements Supplier<java.lang.Long> {
SplittableRandom r = new SplittableRandom(47);
@Override
public java.lang.Long get() {
return r.nextLong(MOD);
}
public java.lang.Long get(int n) {
return get();
}
public java.lang.Long[] array(int sz) {
long[] primitive = new Plong().array(sz);
java.lang.Long[] result =
new java.lang.Long[sz];
for(int i = 0; i < sz; i++)
result[i] = primitive[i];
return result;
}
}
class Plong implements LongSupplier {
SplittableRandom r = new SplittableRandom(47);
@Override
public long getAsLong() {
return r.nextLong(MOD);
}
public long get(int n) { return getAsLong(); }
public long[] array(int sz) {
return r.longs(sz, 0, MOD).toArray();
}
}
class Float
implements Supplier<java.lang.Float> {
SplittableRandom r = new SplittableRandom(47);
@Override
public java.lang.Float get() {
return (float)trim(r.nextDouble());
}
public java.lang.Float get(int n) {
return get();
}
public java.lang.Float[] array(int sz) {
java.lang.Float[] result =
new java.lang.Float[sz];
Arrays.setAll(result, n -> get());
return result;
}
}
class Pfloat {
public float[] array(int sz) {
return primitive(new Float().array(sz));
}
}
static double trim(double d) {
return
((double)Math.round(d * 1000.0)) / 100.0;
}
class Double
implements Supplier<java.lang.Double> {
SplittableRandom r = new SplittableRandom(47);
@Override
public java.lang.Double get() {
return trim(r.nextDouble());
}
public java.lang.Double get(int n) {
return get();
}
public java.lang.Double[] array(int sz) {
double[] primitive =
new Rand.Pdouble().array(sz);
java.lang.Double[] result =
new java.lang.Double[sz];
for(int i = 0; i < sz; i++)
result[i] = primitive[i];
return result;
}
}
class Pdouble implements DoubleSupplier {
SplittableRandom r = new SplittableRandom(47);
@Override
public double getAsDouble() {
return trim(r.nextDouble());
}
public double get(int n) {
return getAsDouble();
}
public double[] array(int sz) {
double[] result = r.doubles(sz).toArray();
Arrays.setAll(result,
n -> result[n] = trim(result[n]));
return result;
}
}
class String
implements Supplier<java.lang.String> {
SplittableRandom r = new SplittableRandom(47);
private int strlen = 7; // Default length
public String() {}
public String(int strLength) {
strlen = strLength;
}
@Override
public java.lang.String get() {
return r.ints(strlen, 'a', 'z' + 1)
.collect(StringBuilder::new,
StringBuilder::appendCodePoint,
StringBuilder::append).toString();
}
public java.lang.String get(int n) {
return get();
}
public java.lang.String[] array(int sz) {
java.lang.String[] result =
new java.lang.String[sz];
Arrays.setAll(result, n -> get());
return result;
}
}
}