OnJava8-Examples/onjava/Rand.java at master · BruceEckel/OnJava8-Examples · GitHub

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// onjava/Rand.java

// 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;

}

OnJava8-Examples/onjava/Rand.java at master · BruceEckel/OnJava8-Examples · GitHub

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