多个线程中的实例对象会访问相同的 static class 和变量吗？

Question

If in my Main class I create an object like this: Tools tool = new Tools() and inside the Tools constructor I do this:

Web web;
public Tools(){
    web = new Web();
}

Will every thread's tools object reference the same web? I need them all to have a reference to a different Web . Web is a static class that performs operations using a web driver which is why I need them all to be separate.

Answer 1

Will every thread's tools object reference the same web?

All threads will have access to the same reference (provided they all have access to the same instance of Tools ), but they won't necessarily see the same value, because of visibility in terms of the memory model.

They would see the same value if you declared the web member final .

I need them all to have a reference to a different Web

In that case you'd need to use a ThreadLocal<Web> .

ThreadLocal<Web> web = ThreadLocal.withInitial(Web::new);