Java中的ThreadLocal和 InheritableThreadLocal

Java中的ThreadLocal和 InheritableThreadLocal

package com.example.core.mydemo.java;

/**
 * output
 * Thread-0 ThreadLocal value ：null
 * Thread-0 InheritableThreadLocal value ：InheritableThreadLocal string
 */
public class ThreadLocalTest {
    public static void main(String[] args) {
        //主线程中赋值
        ThreadLocal<String> stringThreadLocal = new ThreadLocal<>();

        InheritableThreadLocal<String> stringInheritableThreadLocal = new InheritableThreadLocal<>();

        stringThreadLocal.set("ThreadLocal string");
        stringInheritableThreadLocal.set("InheritableThreadLocal string");

        //子线程中分别打印两个变量的信息
        new Thread(() -> {
            System.out.println(
                    Thread.currentThread().getName() + " ThreadLocal value ：" + stringThreadLocal.get());
            System.out.println(Thread.currentThread().getName() + " InheritableThreadLocal value ："
                    + stringInheritableThreadLocal.get());
        }).start();

    }
}

在上面的测试代码中，主线程中创建了两个变量，类型分别为：ThreadLocal和InheritableThreadLocal
然后在主线程中创建了一个新的线程
在新的线程中，尝试获取他们的值
从打印信息可以看得出来
对于ThreadLocal获取的值为null，而对于InheritableThreadLocal则能够获取到值