From 949030d606028846fc1be47a188ef28a707133b0 Mon Sep 17 00:00:00 2001 From: database-mysql Date: Wed, 5 Aug 2026 06:45:56 +0800 Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20=E9=9A=8F=E6=9C=BA?= =?UTF-8?q?=E6=95=B0=E7=94=9F=E6=88=90?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- README.md | 2 +- .../java/gnu/java/utils/library/main.java | 8 + .../utils/processing/random/defaults.java | 25 +++ .../library/utils/processing/random/Test.java | 47 ++++++ .../utils/processing/random/defauleTest.java | 142 ++++++++++++++++++ 5 files changed, 223 insertions(+), 1 deletion(-) create mode 100644 src/main/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/defaults.java create mode 100644 src/test/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/Test.java create mode 100644 src/test/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/defauleTest.java diff --git a/README.md b/README.md index 5cfed93..2141729 100644 --- a/README.md +++ b/README.md @@ -119,7 +119,7 @@ mvn package 编译成功后，将 `target/gnu-java-utils-library-1.0.0.jar` 放入项目依赖中。
或者在releases中下载最新版jar包，放入项目依赖中。 -#### 使用示例 +#### 使用示例： **pom.xml** ```xml diff --git a/src/main/java/top/gtb520/java/gnu/java/utils/library/main.java b/src/main/java/top/gtb520/java/gnu/java/utils/library/main.java index 4bb02aa..fcd730b 100644 --- a/src/main/java/top/gtb520/java/gnu/java/utils/library/main.java +++ b/src/main/java/top/gtb520/java/gnu/java/utils/library/main.java @@ -1,6 +1,7 @@ package top.gtb520.java.gnu.java.utils.library; import top.gtb520.java.gnu.java.utils.library.utils.print.ColorNameEnum; +import top.gtb520.java.gnu.java.utils.library.utils.processing.random.defaults; public interface main { // 压缩包操作相关接口与方法 @@ -38,4 +39,11 @@ public interface main { top.gtb520.java.gnu.java.utils.library.utils.print.echo.ColorHexPrintln(Message, ColorCode); } } + + // 随机数生成接口与方法 + interface random { + static int defaule(int start_scope, int end_scope) { + return defaults.random(start_scope, end_scope); + } + } } diff --git a/src/main/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/defaults.java b/src/main/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/defaults.java new file mode 100644 index 0000000..2bfcfd1 --- /dev/null +++ b/src/main/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/defaults.java @@ -0,0 +1,25 @@ +package top.gtb520.java.gnu.java.utils.library.utils.processing.random; + +import java.util.concurrent.ThreadLocalRandom; + +public class defaults { + /** + * 根据输入的范围生成随机数 + * @param start_scope 起始范围 + * @param end_scope 结束范围 + * @return 随机数 + */ + public static int random(int start_scope, int end_scope) { + int random_double; + + // 处理边界，确保起始范围小于等于结束范围 + if (start_scope > end_scope) { + System.out.println("起始范围不能大于结束范围"); + throw new IllegalArgumentException("起始范围不能大于结束范围"); + } + // 生成随机数 + random_double = ThreadLocalRandom.current().nextInt(start_scope, end_scope + 1); + + return random_double; + } +} diff --git a/src/test/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/Test.java b/src/test/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/Test.java new file mode 100644 index 0000000..f08e695 --- /dev/null +++ b/src/test/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/Test.java @@ -0,0 +1,47 @@ +package top.gtb520.java.gnu.java.utils.library.utils.processing.random; + +import top.gtb520.java.gnu.java.utils.library.main; + +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.ThreadLocalRandom; + +// 毫无意义的随机数测试代码，在循环中执行随机数生成 10 亿次 +public class Test { + public static void main(String[] args) { + int totalTasks = 1_000_000_000; + // 根据CPU核心数创建固定大小的线程池，避免创建过多线程导致上下文切换开销 + int threadCount = Runtime.getRuntime().availableProcessors(); + ExecutorService executor = Executors.newFixedThreadPool(threadCount); + + // 将总任务量平均分配给每个线程 + int tasksPerThread = totalTasks / threadCount; + + for (int t = 0; t < threadCount; t++) { + final int start = t * tasksPerThread; + // 处理余数，确保最后一个线程承担剩余任务 + final int end = (t == threadCount - 1) ? totalTasks : start + tasksPerThread; + + executor.submit(() -> { + // 【核心优化1】使用 ThreadLocalRandom 替代共享 Random + // 每个线程拥有独立的 seed，完全无锁，避免高并发下的 CAS 竞争 + ThreadLocalRandom random = ThreadLocalRandom.current(); + + // 【核心优化2】将 I/O 与计算分离 + // 在实际业务中，应只返回计算结果，而不是在循环中打印 + for (int i = start; i < end; i++) { + int random_i = random.nextInt(1, 1000000001); // [1, 1000000000] + + // 如果确实需要输出，建议降低频率（例如每1000万次输出一次） +// if (i % 10000 == 0) { +// System.out.println("随机数: " + random_i + " 当前循环位置: " + i); +// } + System.out.println("随机数: " + random_i + " 当前循环位置: " + i); + } + }); + } + + // 优雅关闭线程池 + executor.shutdown(); + } +} diff --git a/src/test/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/defauleTest.java b/src/test/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/defauleTest.java new file mode 100644 index 0000000..75292e5 --- /dev/null +++ b/src/test/java/top/gtb520/java/gnu/java/utils/library/utils/processing/random/defauleTest.java @@ -0,0 +1,142 @@ +package top.gtb520.java.gnu.java.utils.library.utils.processing.random; + +public class defauleTest { + + static int passed = 0; + static int failed = 0; + + public static void main(String[] args) { + System.out.println("========== defaults.random 测试开始 =========="); + + testRandomInRange(); + testRandomSameStartAndEnd(); + testRandomNegativeRange(); + testRandomReversedRange(); + testRandomLargeRange(); + testRandomDistribution(); + + System.out.println("========================================"); + System.out.println("测试完成: 通过 " + passed + ", 失败 " + failed); + if (failed > 0) { + System.exit(1); + } + } + + /** + * 测试正常范围内的随机数 + */ + static void testRandomInRange() { + String testName = "testRandomInRange"; + try { + for (int i = 0; i < 100; i++) { + int result = defaults.random(1, 10); + if (result < 1 || result > 10) { + assertCondition(testName + " - 随机数应在[1,10]范围内，实际: " + result, false); + return; + } + } + assertCondition(testName + " - 100次随机数均在[1,10]范围内", true); + } catch (Exception e) { + assertCondition(testName + " - 不应抛出异常: " + e.getMessage(), false); + } + } + + /** + * 测试起始值等于结束值 + */ + static void testRandomSameStartAndEnd() { + String testName = "testRandomSameStartAndEnd"; + try { + int result = defaults.random(5, 5); + assertCondition(testName + " - 结果应等于5，实际: " + result, result == 5); + } catch (Exception e) { + assertCondition(testName + " - 不应抛出异常: " + e.getMessage(), false); + } + } + + /** + * 测试负数范围 + */ + static void testRandomNegativeRange() { + String testName = "testRandomNegativeRange"; + try { + for (int i = 0; i < 100; i++) { + int result = defaults.random(-10, -1); + if (result < -10 || result > -1) { + assertCondition(testName + " - 随机数应在[-10,-1]范围内，实际: " + result, false); + return; + } + } + assertCondition(testName + " - 100次随机数均在[-10,-1]范围内", true); + } catch (Exception e) { + assertCondition(testName + " - 不应抛出异常: " + e.getMessage(), false); + } + } + + /** + * 测试起始值大于结束值应抛出异常 + */ + static void testRandomReversedRange() { + String testName = "testRandomReversedRange"; + try { + defaults.random(10, 1); + assertCondition(testName + " - 应抛出IllegalArgumentException", false); + } catch (IllegalArgumentException e) { + assertCondition(testName + " - 应抛出IllegalArgumentException", true); + } catch (Exception e) { + assertCondition(testName + " - 异常类型不正确: " + e.getClass().getName(), false); + } + } + + /** + * 测试大范围随机数 + */ + static void testRandomLargeRange() { + String testName = "testRandomLargeRange"; + try { + for (int i = 0; i < 100; i++) { + int result = defaults.random(-1000000, 1000000); + if (result < -1000000 || result > 1000000) { + assertCondition(testName + " - 随机数超出范围，实际: " + result, false); + return; + } + } + assertCondition(testName + " - 100次随机数均在[-1000000,1000000]范围内", true); + } catch (Exception e) { + assertCondition(testName + " - 不应抛出异常: " + e.getMessage(), false); + } + } + + /** + * 测试随机数分布（验证不会总是返回同一个值） + */ + static void testRandomDistribution() { + String testName = "testRandomDistribution"; + try { + int first = defaults.random(1, 1000000); + boolean hasDifferent = false; + for (int i = 0; i < 100; i++) { + int result = defaults.random(1, 1000000); + if (result != first) { + hasDifferent = true; + break; + } + } + assertCondition(testName + " - 100次调用应产生不同随机数", hasDifferent); + } catch (Exception e) { + assertCondition(testName + " - 不应抛出异常: " + e.getMessage(), false); + } + } + + // ========== 辅助方法 ========== + + static void assertCondition(String message, boolean condition) { + if (condition) { + System.out.println("[PASS] " + message); + passed++; + } else { + System.out.println("[FAIL] " + message); + failed++; + } + } +}