threadLocal简单使用

threadLocal简单使用

简单代码及注释如下：

public class MyThreadLocal {
    //每个线程独有threadLocal
    static ThreadLocal threadLocal = new ThreadLocal<>();
    public static void main(String[] args) {
        new Thread(() -> {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(threadLocal.get());
        }).start();
        new Thread(() -> {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            threadLocal.set(new Person());
        }).start();
    }
    static class Person {
        String name = "888888888";
    }
}
/*
"C:\Program Files\Java\jdk1.8.0_201\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.6\lib\idea_rt.jar=58329:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.6\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_201\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\rt.jar;G:\ass\target\classes;H:\maven_repository\org\apache\thrift\libthrift\0.9.3\libthrift-0.9.3.jar;H:\maven_repository\org\slf4j\slf4j-api\1.7.12\slf4j-api-1.7.12.jar;H:\maven_repository\org\apache\httpcomponents\httpclient\4.4.1\httpclient-4.4.1.jar;H:\maven_repository\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;H:\maven_repository\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;H:\maven_repository\org\apache\httpcomponents\httpcore\4.4.1\httpcore-4.4.1.jar" ava.service.demo.MyThreadLocal
        null

        Process finished with exit code 0
        其他线程在自己副本set值，自己副本未get得到
        */