1.ThreadLocal的使用主要用于不同线程操作不安全变量时的线程保护

2.ThreadLocal=为Thread提供独有的ThreadLocalMap变量，通过Entry[] table方式存储线程本地变量 3.Thread持有ThreadLocal的引用，所以ThreadLocal需要设置成虚引用避免内存溢出，同时提供删除entry操作避免value值的内存溢出

代码示例

package com.myzy.auth.reetrantlock;

public class TestThreadLocalAndInheritableThreadLocal {
    private static String testStr = null;
    public static void main(String[] args) {
        //用于测试不用线程有自己的线程副本，操作不安全的线程变量不会相互影响
        Runnable r1 = () -> {
            ThreadLocal threadLocal = new ThreadLocal<String>();
            testStr = "我是线程1设置的值";
            threadLocal.set(testStr);
            System.out.println(threadLocal.get());
        };

        //用于测试子线程的本地副本变量的传递，主要通过InheritableThreadLocal来传递，在创建InheritableThreadLocal的
        //时候，会ThreadLocal.ThreadLocalMap inheritableThreadLocals = null; Thread在初始化的时候会把父线程的inheritableThreadLocals复制给子线程作为初始值
        Runnable r2 = () -> {
            ThreadLocal threadLocal = new InheritableThreadLocal();
            testStr = "我是线程2设置的值";
            threadLocal.set(testStr);
            new Thread(new Runnable() {
                @Override
                public void run() {
                    System.out.println("我是线程3  我打印了:" + threadLocal.get());
                }
            }, "线程3").start();
        };

        new Thread(r1, "线程1").start();
        new Thread(r2, "线程1").start();
    }
}

执行结果

"C:\Program Files\Java\jdk1.8.0_231\bin\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:49844,suspend=y,server=n -javaagent:C:\Users\14806\AppData\Local\JetBrains\IntelliJIdea2021.2\captureAgent\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_231\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_231\jre\lib\resources.jar;C:\Program 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0\sentinel-parameter-flow-control-1.8.0.jar;D:\work\repository\com\googlecode\concurrentlinkedhashmap\concurrentlinkedhashmap-lru\1.4.2\concurrentlinkedhashmap-lru-1.4.2.jar;D:\work\repository\com\alibaba\csp\sentinel-cluster-server-default\1.8.0\sentinel-cluster-server-default-1.8.0.jar;D:\work\repository\com\alibaba\csp\sentinel-cluster-common-default\1.8.0\sentinel-cluster-common-default-1.8.0.jar;D:\work\repository\com\alibaba\csp\sentinel-cluster-client-default\1.8.0\sentinel-cluster-client-default-1.8.0.jar;D:\work\repository\com\alibaba\cloud\spring-cloud-alibaba-sentinel-datasource\2.2.3.RELEASE\spring-cloud-alibaba-sentinel-datasource-2.2.3.RELEASE.jar;D:\work\repository\com\fasterxml\jackson\core\jackson-core\2.10.0\jackson-core-2.10.0.jar;D:\work\repository\com\fasterxml\jackson\core\jackson-databind\2.10.0\jackson-databind-2.10.0.jar;D:\work\repository\com\fasterxml\jackson\core\jackson-annotations\2.10.2\jackson-annotations-2.10.2.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2021.2.3\lib\idea_rt.jar" com.myzy.auth.reetrantlock.TestThreadLocalAndInheritableThreadLocal
Connected to the target VM, address: '127.0.0.1:49844', transport: 'socket'
我是线程1设置的值
我是线程3  我打印了:null
Disconnected from the target VM, address: '127.0.0.1:49844', transport: 'socket'

Process finished with exit code 0