ThreadLocal plus-优快云博客

本文链接：https://blog.youkuaiyun.com/lovely960823/article/details/128121672

本文介绍了ThreadLocal和InheritableThreadLocal的区别，并通过代码示例展示了它们在子线程中如何处理变量继承。在主线程中，两者都设置了值，但当创建新的子线程时，InheritableThreadLocal的值会被继承，而ThreadLocal的值不会。

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ThreadLocal 很多人都用过，今天是升级版的InheritableThreadLocal，具体有什么区别，demo看效果就知道了。

public static void main(String[] args) {
        String name="小明";
        ThreadLocalContext.getContext().setValue(name);
        InheritableThreadLocalContext.getContext().setValue(name);
        System.out.println("******************"+ThreadLocalContext.getContext().getValue());
        System.out.println("******************"+InheritableThreadLocalContext.getContext().getValue());
        new Thread(()->{
            System.out.println("---------------------"+ThreadLocalContext.getContext().getValue());
            System.out.println("---------------------"+InheritableThreadLocalContext.getContext().getValue());
        }).start();
    }

在这里插入图片描述
两个实例顺便附上

public class ThreadLocalContext {

    private ThreadLocalContext(){}

    /**
     * 实例化对象
     */
    private static final ThreadLocalContext context = new ThreadLocalContext();

    public static ThreadLocalContext getContext(){
        return context;
    }

    private static final ThreadLocal<String> myLocal = new ThreadLocal<>();

    /**
     * 设置对象
     * @param value
     */
    public void setValue(String value){
        myLocal.set(value);
    }

    /**
     * 获取对象
     * @return
     */
    public String getValue(){
        return myLocal.get();
    }

    /**
     * 移除对象
     */
    public void remove(){
        myLocal.remove();
    }
}

public class InheritableThreadLocalContext {

    private InheritableThreadLocalContext(){}

    private static final  InheritableThreadLocalContext context = new InheritableThreadLocalContext();

    public static InheritableThreadLocalContext getContext(){
        return context;
    }

    private static final InheritableThreadLocal<String> myLocal = new InheritableThreadLocal();

    /**
     * 设置对象
     * @param value
     */
    public void setValue(String value){
        myLocal.set(value);
    }

    /**
     * 获取对象
     * @return
     */
    public String getValue(){
        return myLocal.get();
    }

    /**
     * 移除对象
     */
    public void remove(){
        myLocal.remove();
    }

}