这段代码有什么错误，谢谢
import java.util.concurrent.atomic.AtomicInteger;

public class ThreadSafeClass {
public AtomicInteger i=new AtomicInteger(0);

public static void main(String[] args) {
A_AtomicInteger a=new A_AtomicInteger(i);//这里有问题！！
a.run();
}

class A_AtomicInteger implements Runnable{
public AtomicInteger j;

public void run() {
j.addAndGet(1);
System.out.println(j);
}

public A_AtomicInteger(AtomicInteger j) {
super();
this.j = j;
}
}

}
====================
不知道除了什么问题，竟然提示“Cannot make a static reference to the non-static field i”

[解决办法]
主要是嵌套类的可见性，引起的，我改了一下：import java.util.concurrent.atomic.AtomicInteger;

public class ThreadSafeClass {
public static AtomicInteger i=new AtomicInteger(0);

public static void main(String[] args) {

ThreadSafeClass.A_AtomicInteger a=new ThreadSafeClass.A_AtomicInteger(ThreadSafeClass.i);//这里有问题！！
a.run();
}

public static class A_AtomicInteger implements Runnable{//加了一个静态的
public AtomicInteger j;

public void run() {
j.addAndGet(1);
System.out.println(j);
}

public A_AtomicInteger(AtomicInteger j) {
super();
this.j = j;
}
}

}