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Apache Commons Lang v3 Source Code Files
Apache Commons Lang 3 is the 3rd version of Apache Commons Lang, which provides a host of helper utilities for the java.lang API.
Apache Commons Lang 3 Source Code files are provided in both binary packge (commons-lang3-3.12.0-bin.zip) and source package (commons-lang3-3.12.0-src.zip). You can download them at Apache Commons Lang Website.
Apache Commons Lang 3 Source Code has no dependencies and is compatible with Java 8 and newer versions. You can compile it to generate your own version of Apache Commons Lang 3 JAR file.
You can also browse the source code below:
✍: FYIcenter
⏎ org/apache/commons/lang3/RandomUtils.java
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.lang3; import java.util.Random; /** * <p>Utility library that supplements the standard {@link Random} class.</p> * * <p>Caveat: Instances of {@link Random} are not cryptographically secure.</p> * * <p>Please note that the Apache Commons project provides a component * dedicated to pseudo-random number generation, namely * <a href="https://commons.apache.org/rng">Commons RNG</a>, that may be * a better choice for applications with more stringent requirements * (performance and/or correctness).</p> * * @since 3.3 */ public class RandomUtils { /** * Random object used by random method. This has to be not local to the * random method so as to not return the same value in the same millisecond. */ private static final Random RANDOM = new Random(); /** * <p> * {@code RandomUtils} instances should NOT be constructed in standard * programming. Instead, the class should be used as * {@code RandomUtils.nextBytes(5);}. * </p> * * <p> * This constructor is public to permit tools that require a JavaBean * instance to operate. * </p> */ public RandomUtils() { } /** * <p> * Returns a random boolean value * </p> * * @return the random boolean * @since 3.5 */ public static boolean nextBoolean() { return RANDOM.nextBoolean(); } /** * <p> * Creates an array of random bytes. * </p> * * @param count * the size of the returned array * @return the random byte array * @throws IllegalArgumentException if {@code count} is negative */ public static byte[] nextBytes(final int count) { Validate.isTrue(count >= 0, "Count cannot be negative."); final byte[] result = new byte[count]; RANDOM.nextBytes(result); return result; } /** * <p> * Returns a random integer within the specified range. * </p> * * @param startInclusive * the smallest value that can be returned, must be non-negative * @param endExclusive * the upper bound (not included) * @throws IllegalArgumentException * if {@code startInclusive > endExclusive} or if * {@code startInclusive} is negative * @return the random integer */ public static int nextInt(final int startInclusive, final int endExclusive) { Validate.isTrue(endExclusive >= startInclusive, "Start value must be smaller or equal to end value."); Validate.isTrue(startInclusive >= 0, "Both range values must be non-negative."); if (startInclusive == endExclusive) { return startInclusive; } return startInclusive + RANDOM.nextInt(endExclusive - startInclusive); } /** * <p> Returns a random int within 0 - Integer.MAX_VALUE </p> * * @return the random integer * @see #nextInt(int, int) * @since 3.5 */ public static int nextInt() { return nextInt(0, Integer.MAX_VALUE); } /** * <p> * Returns a random long within the specified range. * </p> * * @param startInclusive * the smallest value that can be returned, must be non-negative * @param endExclusive * the upper bound (not included) * @throws IllegalArgumentException * if {@code startInclusive > endExclusive} or if * {@code startInclusive} is negative * @return the random long */ public static long nextLong(final long startInclusive, final long endExclusive) { Validate.isTrue(endExclusive >= startInclusive, "Start value must be smaller or equal to end value."); Validate.isTrue(startInclusive >= 0, "Both range values must be non-negative."); if (startInclusive == endExclusive) { return startInclusive; } return startInclusive + nextLong(endExclusive - startInclusive); } /** * <p> Returns a random long within 0 - Long.MAX_VALUE </p> * * @return the random long * @see #nextLong(long, long) * @since 3.5 */ public static long nextLong() { return nextLong(Long.MAX_VALUE); } /** * Generates a {@code long} value between 0 (inclusive) and the specified * value (exclusive). * * @param n Bound on the random number to be returned. Must be positive. * @return a random {@code long} value between 0 (inclusive) and {@code n} * (exclusive). */ private static long nextLong(final long n) { // Extracted from o.a.c.rng.core.BaseProvider.nextLong(long) long bits; long val; do { bits = RANDOM.nextLong() >>> 1; val = bits % n; } while (bits - val + (n - 1) < 0); return val; } /** * <p> * Returns a random double within the specified range. * </p> * * @param startInclusive * the smallest value that can be returned, must be non-negative * @param endExclusive * the upper bound (not included) * @throws IllegalArgumentException * if {@code startInclusive > endExclusive} or if * {@code startInclusive} is negative * @return the random double */ public static double nextDouble(final double startInclusive, final double endExclusive) { Validate.isTrue(endExclusive >= startInclusive, "Start value must be smaller or equal to end value."); Validate.isTrue(startInclusive >= 0, "Both range values must be non-negative."); if (startInclusive == endExclusive) { return startInclusive; } return startInclusive + ((endExclusive - startInclusive) * RANDOM.nextDouble()); } /** * <p> Returns a random double within 0 - Double.MAX_VALUE </p> * * @return the random double * @see #nextDouble(double, double) * @since 3.5 */ public static double nextDouble() { return nextDouble(0, Double.MAX_VALUE); } /** * <p> * Returns a random float within the specified range. * </p> * * @param startInclusive * the smallest value that can be returned, must be non-negative * @param endExclusive * the upper bound (not included) * @throws IllegalArgumentException * if {@code startInclusive > endExclusive} or if * {@code startInclusive} is negative * @return the random float */ public static float nextFloat(final float startInclusive, final float endExclusive) { Validate.isTrue(endExclusive >= startInclusive, "Start value must be smaller or equal to end value."); Validate.isTrue(startInclusive >= 0, "Both range values must be non-negative."); if (startInclusive == endExclusive) { return startInclusive; } return startInclusive + ((endExclusive - startInclusive) * RANDOM.nextFloat()); } /** * <p> Returns a random float within 0 - Float.MAX_VALUE </p> * * @return the random float * @see #nextFloat(float, float) * @since 3.5 */ public static float nextFloat() { return nextFloat(0, Float.MAX_VALUE); } }
⏎ org/apache/commons/lang3/RandomUtils.java
Or download all of them as a single archive file:
File name: commons-lang3-3.12.0-sources.jar File size: 651724 bytes Release date: 2020-01-22 Download
⇒ Download and Install commons-lang3-3.8.1-bin.zip
⇐ Download Apache Commons Lang v3 Source Package
2022-10-19, 150758👍, 3💬
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