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包获取地址 http://download.redis.io/releases/ 单机环境下安装 wget http://download.redis.io/releases/redis-6.2.6.tar.gz tart -zxvf redis-6.2.6.tar.gz mv redis-6.2.6.tar.gz redis cd ./redis make cd ./src make install # 启动redis ./redis-server # 连接redis redis-cli -h 127.0

/** * A hint to the scheduler that the current thread is willing to yield * its current use of a processor. The scheduler is free to ignore this * hint. * * <p> Yield is a heuristic attempt to improve relative progressio...

实例 package com.example.demo.thread; public class WaitTest { public static Object lock = new Object(); public static void main(String[] args) throws InterruptedException { WaitThread1 waitThread1 = new WaitThread1(); WaitThread2 wa

/** * Waits at most {@code millis} milliseconds for this thread to * die. A timeout of {@code 0} means to wait forever. * * <p> This implementation uses a loop of {@code this.wait} calls * conditioned on {@code this.isAl...

A blocking queue in which each insert operation must wait for a corresponding remove operation by another thread, and vice versa. A synchronous queue does not have any internal capacity, not even a capacity of one. You cannot peek at a synchronous queue be

public static void main(String[] args) { /** * 线程安全 */ Hashtable<String, String> hashtable = new Hashtable<>(); hashtable.put("abc", "afc"); System.out.println(hashtable.get("abc")); /

下载安装 https://jmeter.apache.org/download_jmeter.cgi windows机器下载zip包，解压 jmeter安装依赖java环境，请配置好java环境，这个就不写了 配置jmeter环境变量配置JMETER_HOME C:\Users\Administrator\Desktop\apache-jmeter-5.4.1\apache-jmeter-5.4.1 配置path %JMETER_HOME%\lib\ext\ApacheJMeter_core.jar %J

newCachedThreadPool Executors /** 注意：这个是网易翻译结果，英文好的请忽略中文注释 创建一个线程池，该线程池根据需要创建新的线程，但在前面构建的线程可用时将重用它们。 这些池通常会提高执行许多短时间异步任务的程序的性能。执行调用将重用先前构造的线程(如果可用)。 如果没有可用的线程，将创建一个新线程并将其添加到池中。 超过60秒未被使用的线程将被终止并从缓存中删除。 因此，保持足够长的空闲时间的池将不会消耗任何资源。 注意，具有类似属性但细节不同(例如，超时参数)的池可以使

ReentrantReadWriteLock Sync NonfairSync FairSync ReadLock WriteLock tryAcquire protected final boolean tryAcquire(int acquires) { /* * Walkthrough: * 1. If read count nonzero or write count nonzero

1 which java /usr/bin/java 2 ls -lrt /usr/bin/java /usr/bin/java -> /etc/alternatives/java 3 ls -lrt /etc/alternatives/java /etc/alternatives/java -> /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java