Here is the whole code : import java.util.ArrayList;

public class Test>{

ThreadLocal<ArrayList<E>>arraylist=new ThreadLocal<ArrayList<E>>(){
    @Override
    protected ArrayList<E> initialValue() {
        // TODO Auto-generated method stub
        //return super.initialValue();
        ArrayList<E>arraylist=new ArrayList<E>();
        for(int i=0;i<=20;i++)
        arraylist.add((E) new Integer(i));
        return arraylist;
    }
};


class MyRunnable implements Runnable{

    private Test mytest;

    public MyRunnable(Test test){
        mytest=test;
        // TODO Auto-generated constructor stub
    }
    @Override
    public void run() {
            System.out.println("before"+mytest.arraylist.toString());
            ArrayList<E>myarraylist=(ArrayList<E>) mytest.arraylist.get();
            myarraylist.add((E) new Double(Math.random()));
            mytest.arraylist.set(myarraylist);
            System.out.println("after"+mytest.arraylist.toString());
        }

        // TODO Auto-generated method stub

    }
public static void main(String[] args){

    Test test=new Test<Double>();

    System.out.println(test.arraylist.toString());

    new Thread(new MyRunnable(test)).start();

    new Thread(new MyRunnable(test)).start();

    System.out.println(arraylist.toString());

}

} my questions are:

1\ why the new Thread(new MyRunnable(test)).start(); cause the error:

Cannot make a static reference to the non-static type MyRunnable

?

2\

what is the static reference refer to right here? thx in advanced